示例：使用 JavaScript 检索实体元数据

项目
07/06/2017

发布日期： 2016年11月

适用于： Dynamics CRM 2015

此示例代码适用于 Microsoft Dynamics CRM 2015 和 Microsoft Dynamics CRM Online 2015 更新。下载 Microsoft Dynamics CRM SDK 包。它可能位于下载包的以下位置：

SDK\SampleCode\JS\SOAPForJScript\SOAPForJScript\MetaDataDemo.htm

SDK\SampleCode\JS\SOAPForJScript\SOAPForJScript\Scripts\SDK.MetaData.js

要求

若要使用该代码，您必须为每个文件创建 Web 资源。每个 Web 资源的名称必须遵循下面的模式：

<solution publisher customization prefix>_/MetaDataDemo.htm
<solution publisher customization prefix>_/Scripts/SDK.MetaData.js

如果您只想了解此示例如何工作，则可以安装（导入）位于 SDK\SampleCode\JS\SOAPForJScript 的下载文件中包含的 SOAPEndpointforJScript_1_0_0_1_managed.zip 托管解决方案。如果安装此托管解决方案，并希望使用本主题中的名称创建 Web 资源，则您的解决方案发布商自定义前缀不能是“sample”，除非您卸载（删除）此托管解决方案。

演示

此示例演示如何使用通过演练：与 JavaScript 结合使用现代应用程序 SOAP 终结点中所述步骤创建的示例 JavaScript 库。该库支持使用异步 JavaScript 的 RetrieveAllEntitiesRequest 和 RetrieveEntityRequest 消息的使用。

示例

MetaDataDemo.htm 页使用 SDK.MetaData.js 文件中包含的 SDK.MetaData.RetrieveAllEntities 和 SDK.MetaData.RetrieveEntity 函数检索数据。

加载页面时，该页面会检索有关系统中所有实体的信息，然后显示呈现每个实体的 SchemaName 的列表。当您单击实体列表项时，将检索有关实体属性的信息并显示 SchemaName 属性。检索完属性后，单击实体列表项会切换属性列表的显示。


<html lang="en-US">
<head>
 <title>Metadata Demonstration</title>
 <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <script src="../ClientGlobalContext.js.aspx" type="text/javascript"></script>
 <script src="Scripts/SDK.MetaData.js" type="text/javascript"></script>
 <script type="text/javascript">
  // An unordered list element to add Entity list items to
  var results;
  // An area to display messages
  var message;

  // Alert flag to indicate the changes
  var alertFlag;

  function startSample() {
   ///<summary>
   /// Initializes the sample when the document is ready
   ///</summary>
   //Assign the global variables
   results = document.getElementById("results");
   message = document.getElementById("message");
   alertFlag = document.getElementById("dispalert");
   document.getElementById("btnstartSample").setAttribute("disabled", "disabled");
   //Retrieve entities
   SDK.Metadata.RetrieveAllEntities(SDK.Metadata.EntityFilters.Entity,
    false,
    successRetrieveAllEntities,
    errorRetrieveAllEntities);
   setText(message, "Loading...");

  }

  function successRetrieveAllEntities(entityMetadataCollection) {
   ///<summary>
   /// Receives the data from SDK.Metadata.RetrieveAllEntities and 
   /// appends a list item to results for each one.
   ///</summary>

   entityMetadataCollection.sort(function (a, b) {
    if (a.LogicalName < b.LogicalName)
    { return -1 }
    if (a.LogicalName > b.LogicalName)
    { return 1 }
    return 0;
   });

   for (var i = 0; i < entityMetadataCollection.length; i++) {

    var entity = entityMetadataCollection[i];
    var entityNode = document.createElement("li");
    var entitySpan = document.createElement("span");

    setText(entitySpan, entity.SchemaName);
    entitySpan.id = entity.LogicalName;
    entitySpan.title = "Click to Retrieve Attributes.";
    entitySpan.attributesRetrieved = false;
    // Add the event handler to retrieve attributes 
    entitySpan.onclick = retrieveAttributes;
    entitySpan.style.cursor = "pointer";

    entityNode.appendChild(entitySpan);
    results.appendChild(entityNode);

   }

   setText(message, entityMetadataCollection.length +
   " entities retrieved. Click each entity to retrieve the entity attributes.");
   if (alertFlag.checked == true)
    alert("Entity List Retrieved.");
  }
  function errorRetrieveAllEntities(error) {
   ///<summary>
   /// Displays the error returned from  SDK.Metadata.RetrieveAllEntities if it fails.
   ///</summary>
   setText(message, error.message);
   if (alertFlag.checked == true)
    alert("An Error occurred.");
  }

  function retrieveAttributes() {
   ///<summary>
   /// Retrieves attributes for the entity list item that is clicked
   ///</summary>
   if (this.attributesRetrieved == false) {
    var entityLogicalName = this.id;
    // Display an entity list item level notification while retrieving data.
    var notification = document.createElement("span");


    setText(notification, "   Retrieving attributes for " + getText(this) + "...");
    notification.id = entityLogicalName + "Notification";
    this.parentElement.appendChild(notification);

    SDK.Metadata.RetrieveEntity(SDK.Metadata.EntityFilters.Attributes,
    this.id,
    null,
    false,
    function (entityMetadata) { successRetrieveEntity(entityLogicalName, entityMetadata); },
    errorRetrieveEntity);


   }
   this.attributesRetrieved = true;
   this.title = "";
  }

  function successRetrieveEntity(logicalName, entityMetadata) {
   ///<summary>
   /// Retrieves attributes for the entity list item that is clicked
   ///</summary>

   // Update the entity list item notification when data is retrieved.

   entityMetadata.Attributes.sort(function (a, b) {
    if (a.LogicalName < b.LogicalName)
    { return -1 }
    if (a.LogicalName > b.LogicalName)
    { return 1 }
    return 0;
   });

   var notification = setText(document.getElementById(logicalName +
   "Notification"), "   Retrieved " + entityMetadata.Attributes.length + " attributes.");

   var attributeList = document.createElement("ul");

   for (var i = 0; i < entityMetadata.Attributes.length; i++) {
    var attribute = entityMetadata.Attributes[i];
    var attributeNode = document.createElement("li");
    setText(attributeNode, attribute.SchemaName);
    attributeList.appendChild(attributeNode);
   }
   // Access the entity list item element
   var entityNode = document.getElementById(logicalName).parentElement;

   entityNode.appendChild(attributeList);
   entityNode.attributesDisplayed = true;
   // Attach event handler to toggle display of attributes.
   entityNode.firstChild.onclick = toggleDisplayAttributes;
   entityNode.firstChild.title = "Click to hide attributes.";
   if (alertFlag.checked == true)
    alert(entityMetadata.SchemaName + " attributes retrieved.");
  }
  function errorRetrieveEntity(error) {
   ///<summary>
   /// Displays the error returned from SDK.Metadata.RetrieveEntity if it fails.
   ///</summary>
   setText(message, error.message);
   if (alertFlag.checked == true)
    alert("Error!");
  }

  function toggleDisplayAttributes() {
   ///<summary>
   /// toggles whether the list of attributes is displayed.
   ///</summary>

   if (this.parentElement.attributesDisplayed) {
    this.parentElement.lastChild.style.display = "none";
    this.parentElement.attributesDisplayed = false;
    this.title = "Click to show attributes.";

    if (alertFlag.checked == true)
     alert("Attributes were hidden.");
   }
   else {
    this.parentElement.lastChild.style.display = "block";
    this.parentElement.attributesDisplayed = true;
    this.title = "Click to hide attributes.";

    if (alertFlag.checked == true)
     alert("Attributes are displayed.");
   }

  }

  // setText and getText mitigate differences in how browsers set or get text content.
  function setText(node, text) {
   if (typeof (node.innerText) != "undefined") {
    node.innerText = text;
   }
   else {
    node.textContent = text;
   }

  }

  function getText(node) {
   if (typeof (node.innerText) != "undefined") {
    return node.innerText;
   }
   else {
    return node.textContent;
   }
  }

 </script>
</head>
<body style="font-family: Segoe UI;">
 <h1>
  Metadata Demonstration Sample</h1>
 <p>
  This form requires JavaScript and will update the page dynamically.</p>
 <p>
  <input id="dispalert" name="dispalert" type="checkbox" value="alert" /><label for="dispalert">Display alert window when data changes.</label></p>
 <p>
  <label id="lblstartSample" for="btnstartSample">
   Click to start the sample:
  </label>
  <input type="button" id="btnstartSample" name="btnstartSample" value="Start" onclick="startSample()" /></p>
 <div id="message">
 </div>
 <ul id="results">
 </ul>
</body>
</html>

示例

SDK.MetaData.js 文件是一个 JScript 库，包含调用页面使用的 SDK.MetaData.RetrieveAllEntities 和 SDK.MetaData.RetrieveEntity 公用函数。这些函数发送异步请求并将结果传递回每个函数的 successCallBack 参数中指定的函数。

SDK.MetaData.EntityFilters 提供一种类型的枚举，该枚举与 EntityFilters 和 RetrieveAllEntitiesRequest 消息使用的 RetrieveEntityRequest 枚举对应。其余专用函数用于解析请求结果中返回的 XML。

此示例演示 SdkClientVersion 值“6.0”如何必须包括在 SOAP 标头中才能返回下面片段所示的图像属性。

"<soapenv:Header><a:SdkClientVersion xmlns:a=\"https://schemas.microsoft.com/xrm/2011/Contracts\">6.0</a:SdkClientVersion></soapenv:Header>",



SDK = window.SDK || { __namespace: true };
SDK.Metadata = SDK.Metadata || { __namespace: true };

(function () {


 this.RetrieveAllEntities = function (EntityFilters, RetrieveAsIfPublished, successCallBack, errorCallBack, passThroughObject) {
  ///<summary>
  /// Sends an asynchronous RetrieveAllEntities Request to retrieve all entities in the system
  ///</summary>
  ///<returns>entityMetadataCollection</returns>
  ///<param name="EntityFilters" type="Number">
  /// SDK.Metadata.EntityFilters provides an enumeration for the filters available to filter which data is retrieved.
  /// Include only those elements of the entity you want to retrieve. Retrieving all parts of all entitities may take significant time.
  ///</param>
  ///<param name="RetrieveAsIfPublished" type="Boolean">
  /// Sets whether to retrieve the metadata that has not been published.
  ///</param>
  ///<param name="successCallBack" type="Function">
  /// The function that will be passed through and be called by a successful response.
  /// This function must accept the entityMetadataCollection as a parameter.
  ///</param>
  ///<param name="errorCallBack" type="Function">
  /// The function that will be passed through and be called by a failed response.
  /// This function must accept an Error object as a parameter.
  ///</param>
  ///<param name="passThroughObject" optional="true"  type="Object">
  /// An Object that will be passed through to as the second parameter to the successCallBack.
  ///</param>
  if ((typeof EntityFilters != "number") || (EntityFilters < 1 || EntityFilters > 15))
  { throw new Error("SDK.Metadata.RetrieveAllEntities EntityFilters must be a SDK.Metadata.EntityFilters value."); }
  if (typeof RetrieveAsIfPublished != "boolean")
  { throw new Error("SDK.Metadata.RetrieveAllEntities RetrieveAsIfPublished must be a boolean value."); }
  if (typeof successCallBack != "function")
  { throw new Error("SDK.Metadata.RetrieveAllEntities successCallBack must be a function."); }
  if (typeof errorCallBack != "function")
  { throw new Error("SDK.Metadata.RetrieveAllEntities errorCallBack must be a function."); }

  var entityFiltersValue = _evaluateEntityFilters(EntityFilters);

  var request = [
  "<soapenv:Envelope xmlns:soapenv=\"https://schemas.xmlsoap.org/soap/envelope/\">",
    //Allows retrieval if ImageAttributeMetadata objects
  "<soapenv:Header><a:SdkClientVersion xmlns:a=\"https://schemas.microsoft.com/xrm/2011/Contracts\">7.0</a:SdkClientVersion></soapenv:Header>",
   "<soapenv:Body>",
    "<Execute xmlns=\"https://schemas.microsoft.com/xrm/2011/Contracts/Services\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\">",
     "<request i:type=\"a:RetrieveAllEntitiesRequest\" xmlns:a=\"https://schemas.microsoft.com/xrm/2011/Contracts\">",
      "<a:Parameters xmlns:b=\"http://schemas.datacontract.org/2004/07/System.Collections.Generic\">",
       "<a:KeyValuePairOfstringanyType>",
        "<b:key>EntityFilters</b:key>",
        "<b:value i:type=\"c:EntityFilters\" xmlns:c=\"https://schemas.microsoft.com/xrm/2011/Metadata\">" + _xmlEncode(entityFiltersValue) + "</b:value>",
       "</a:KeyValuePairOfstringanyType>",
       "<a:KeyValuePairOfstringanyType>",
        "<b:key>RetrieveAsIfPublished</b:key>",
        "<b:value i:type=\"c:boolean\" xmlns:c=\"http://www.w3.org/2001/XMLSchema\">" + _xmlEncode(RetrieveAsIfPublished.toString()) + "</b:value>",
       "</a:KeyValuePairOfstringanyType>",
      "</a:Parameters>",
      "<a:RequestId i:nil=\"true\" />",
      "<a:RequestName>RetrieveAllEntities</a:RequestName>",
    "</request>",
   "</Execute>",
  "</soapenv:Body>",
  "</soapenv:Envelope>"].join("");
  var req = new XMLHttpRequest();
  req.open("POST", _getUrl() + "/XRMServices/2011/Organization.svc/web", true);
  try { req.responseType = 'msxml-document'} catch(e){}
  req.setRequestHeader("Accept", "application/xml, text/xml, */*");
  req.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
  req.setRequestHeader("SOAPAction", "https://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/Execute");
  req.onreadystatechange = function () {
   if (req.readyState == 4 /* complete */) {
   req.onreadystatechange = null; //Addresses potential memory leak issue with IE
    if (req.status == 200) {
     //Success              
     var doc = req.responseXML;
     try{_setSelectionNamespaces(doc);}catch(e){}
     var entityMetadataNodes = _selectNodes(doc, "//c:EntityMetadata");
     var entityMetadataCollection = [];
     for (var i = 0; i < entityMetadataNodes.length; i++) {
      var a = _objectifyNode(entityMetadataNodes[i]);
      a._type = "EntityMetadata";
      entityMetadataCollection.push(a);
     }

     successCallBack(entityMetadataCollection, passThroughObject);
    }
    else {
     errorCallBack(_getError(req));
    }
   }
  };
  req.send(request);

 };

 this.RetrieveEntity = function (EntityFilters, LogicalName, MetadataId, RetrieveAsIfPublished, successCallBack, errorCallBack, passThroughObject) {
  ///<summary>
  /// Sends an asynchronous RetrieveEntity Request to retrieve a specific entity
  ///</summary>
  ///<returns>entityMetadata</returns>
  ///<param name="EntityFilters" type="Number">
  /// SDK.Metadata.EntityFilters provides an enumeration for the filters available to filter which data is retrieved.
  /// Include only those elements of the entity you want to retrieve. Retrieving all parts of all entitities may take significant time.
  ///</param>
  ///<param name="LogicalName" optional="true" type="String">
  /// The logical name of the entity requested. A null value may be used if a MetadataId is provided.
  ///</param>
  ///<param name="MetadataId" optional="true" type="String">
  /// A null value or an empty guid may be passed if a LogicalName is provided.
  ///</param>
  ///<param name="RetrieveAsIfPublished" type="Boolean">
  /// Sets whether to retrieve the metadata that has not been published.
  ///</param>
  ///<param name="successCallBack" type="Function">
  /// The function that will be passed through and be called by a successful response.
  /// This function must accept the entityMetadata as a parameter.
  ///</param>
  ///<param name="errorCallBack" type="Function">
  /// The function that will be passed through and be called by a failed response.
  /// This function must accept an Error object as a parameter.
  ///</param>
  ///<param name="passThroughObject" optional="true"  type="Object">
  /// An Object that will be passed through to as the second parameter to the successCallBack.
  ///</param>
  if ((typeof EntityFilters != "number") || (EntityFilters < 1 || EntityFilters > 15))
  { throw new Error("SDK.Metadata.RetrieveEntity EntityFilters must be a SDK.Metadata.EntityFilters value."); }
  if (LogicalName == null &amp;&amp; MetadataId == null) {
   throw new Error("SDK.Metadata.RetrieveEntity requires either the LogicalName or MetadataId parameter not be null.");
  }
  if (LogicalName != null) {
   if (typeof LogicalName != "string")
   { throw new Error("SDK.Metadata.RetrieveEntity LogicalName must be a string value."); }
   MetadataId = "00000000-0000-0000-0000-000000000000";
  }
  if (MetadataId != null &amp;&amp; LogicalName == null) {
   if (typeof MetadataId != "string")
   { throw new Error("SDK.Metadata.RetrieveEntity MetadataId must be a string value."); }
  }
  if (typeof RetrieveAsIfPublished != "boolean")
  { throw new Error("SDK.Metadata.RetrieveEntity RetrieveAsIfPublished must be a boolean value."); }
  if (typeof successCallBack != "function")
  { throw new Error("SDK.Metadata.RetrieveEntity successCallBack must be a function."); }
  if (typeof errorCallBack != "function")
  { throw new Error("SDK.Metadata.RetrieveEntity errorCallBack must be a function."); }
  var entityFiltersValue = _evaluateEntityFilters(EntityFilters);

  var entityLogicalNameValueNode = "";
  if (LogicalName == null)
  { entityLogicalNameValueNode = "<b:value i:nil=\"true\" />"; }
  else
  { entityLogicalNameValueNode = "<b:value i:type=\"c:string\"   xmlns:c=\"http://www.w3.org/2001/XMLSchema\">" + _xmlEncode(LogicalName.toLowerCase()) + "</b:value>"; }
  var request = [
  "<soapenv:Envelope xmlns:soapenv=\"https://schemas.xmlsoap.org/soap/envelope/\">",
    //Allows retrieval if ImageAttributeMetadata objects
  "<soapenv:Header><a:SdkClientVersion xmlns:a=\"https://schemas.microsoft.com/xrm/2011/Contracts\">6.0</a:SdkClientVersion></soapenv:Header>",
   "<soapenv:Body>",
    "<Execute xmlns=\"https://schemas.microsoft.com/xrm/2011/Contracts/Services\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\">",
     "<request i:type=\"a:RetrieveEntityRequest\" xmlns:a=\"https://schemas.microsoft.com/xrm/2011/Contracts\">",
      "<a:Parameters xmlns:b=\"http://schemas.datacontract.org/2004/07/System.Collections.Generic\">",
       "<a:KeyValuePairOfstringanyType>",
        "<b:key>EntityFilters</b:key>",
        "<b:value i:type=\"c:EntityFilters\" xmlns:c=\"https://schemas.microsoft.com/xrm/2011/Metadata\">" + _xmlEncode(entityFiltersValue) + "</b:value>",
       "</a:KeyValuePairOfstringanyType>",
       "<a:KeyValuePairOfstringanyType>",
        "<b:key>MetadataId</b:key>",
        "<b:value i:type=\"ser:guid\"  xmlns:ser=\"https://schemas.microsoft.com/2003/10/Serialization/\">" + _xmlEncode(MetadataId) + "</b:value>",
       "</a:KeyValuePairOfstringanyType>",
       "<a:KeyValuePairOfstringanyType>",
        "<b:key>RetrieveAsIfPublished</b:key>",
        "<b:value i:type=\"c:boolean\" xmlns:c=\"http://www.w3.org/2001/XMLSchema\">" + _xmlEncode(RetrieveAsIfPublished.toString()) + "</b:value>",
       "</a:KeyValuePairOfstringanyType>",
       "<a:KeyValuePairOfstringanyType>",
        "<b:key>LogicalName</b:key>",
         entityLogicalNameValueNode,
       "</a:KeyValuePairOfstringanyType>",
      "</a:Parameters>",
      "<a:RequestId i:nil=\"true\" />",
      "<a:RequestName>RetrieveEntity</a:RequestName>",
     "</request>",
    "</Execute>",
   "</soapenv:Body>",
  "</soapenv:Envelope>"].join("");
  var req = new XMLHttpRequest();
  req.open("POST", _getUrl() + "/XRMServices/2011/Organization.svc/web", true);
  try { req.responseType = 'msxml-document'} catch(e){}
  req.setRequestHeader("Accept", "application/xml, text/xml, */*");
  req.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
  req.setRequestHeader("SOAPAction", "https://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/Execute");
  req.onreadystatechange = function () {
   if (req.readyState == 4 /* complete */) {
   req.onreadystatechange = null; //Addresses potential memory leak issue with IE
    if (req.status == 200) {
     var doc = req.responseXML;
     try{_setSelectionNamespaces(doc);}catch(e){}
     var a = _objectifyNode(_selectSingleNode(doc, "//b:value"));
     a._type = "EntityMetadata";
     successCallBack(a, passThroughObject);
    }
    else {
     //Failure
     errorCallBack(_getError(req));
    }
   }

  };
  req.send(request);


 };

 this.RetrieveAttribute = function (EntityLogicalName, LogicalName, MetadataId, RetrieveAsIfPublished, successCallBack, errorCallBack, passThroughObject) {
  ///<summary>
  /// Sends an asynchronous RetrieveAttribute Request to retrieve a specific entity
  ///</summary>
  ///<returns>AttributeMetadata</returns>
  ///<param name="EntityLogicalName"  optional="true" type="String">
  /// The logical name of the entity for the attribute requested. A null value may be used if a MetadataId is provided.
  ///</param>
  ///<param name="LogicalName" optional="true" type="String">
  /// The logical name of the attribute requested. 
  ///</param>
  ///<param name="MetadataId" optional="true" type="String">
  /// A null value may be passed if an EntityLogicalName and LogicalName is provided.
  ///</param>
  ///<param name="RetrieveAsIfPublished" type="Boolean">
  /// Sets whether to retrieve the metadata that has not been published.
  ///</param>
  ///<param name="successCallBack" type="Function">
  /// The function that will be passed through and be called by a successful response.
  /// This function must accept the entityMetadata as a parameter.
  ///</param>
  ///<param name="errorCallBack" type="Function">
  /// The function that will be passed through and be called by a failed response.
  /// This function must accept an Error object as a parameter.
  ///</param>
  ///<param name="passThroughObject" optional="true"  type="Object">
  /// An Object that will be passed through to as the second parameter to the successCallBack.
  ///</param>
  if (EntityLogicalName == null &amp;&amp; LogicalName == null &amp;&amp; MetadataId == null) {
   throw new Error("SDK.Metadata.RetrieveAttribute requires either the EntityLogicalName and LogicalName  parameters or the MetadataId parameter not be null.");
  }
  if (MetadataId != null &amp;&amp; EntityLogicalName == null &amp;&amp; LogicalName == null) {
   if (typeof MetadataId != "string")
   { throw new Error("SDK.Metadata.RetrieveEntity MetadataId must be a string value."); }
  }
  else
  { MetadataId = "00000000-0000-0000-0000-000000000000"; }
  if (EntityLogicalName != null) {
   if (typeof EntityLogicalName != "string") {
    { throw new Error("SDK.Metadata.RetrieveAttribute EntityLogicalName must be a string value."); }
   }
  }
  if (LogicalName != null) {
   if (typeof LogicalName != "string") {
    { throw new Error("SDK.Metadata.RetrieveAttribute LogicalName must be a string value."); }
   }

  }
  if (typeof RetrieveAsIfPublished != "boolean")
  { throw new Error("SDK.Metadata.RetrieveAttribute RetrieveAsIfPublished must be a boolean value."); }
  if (typeof successCallBack != "function")
  { throw new Error("SDK.Metadata.RetrieveAttribute successCallBack must be a function."); }
  if (typeof errorCallBack != "function")
  { throw new Error("SDK.Metadata.RetrieveAttribute errorCallBack must be a function."); }

  var entityLogicalNameValueNode;
  if (EntityLogicalName == null) {
   entityLogicalNameValueNode = "<b:value i:nil=\"true\" />";
  }
  else {
   entityLogicalNameValueNode = "<b:value i:type=\"c:string\" xmlns:c=\"http://www.w3.org/2001/XMLSchema\">" + _xmlEncode(EntityLogicalName.toLowerCase()) + "</b:value>";
  }
  var logicalNameValueNode;
  if (LogicalName == null) {
   logicalNameValueNode = "<b:value i:nil=\"true\" />";
  }
  else {
   logicalNameValueNode = "<b:value i:type=\"c:string\"   xmlns:c=\"http://www.w3.org/2001/XMLSchema\">" + _xmlEncode(LogicalName.toLowerCase()) + "</b:value>";
  }
  var request = [
  "<soapenv:Envelope xmlns:soapenv=\"https://schemas.xmlsoap.org/soap/envelope/\">",
  //Allows retrieval if ImageAttributeMetadata objects
  "<soapenv:Header><a:SdkClientVersion xmlns:a=\"https://schemas.microsoft.com/xrm/2011/Contracts\">6.0</a:SdkClientVersion></soapenv:Header>",
   "<soapenv:Body>",
    "<Execute xmlns=\"https://schemas.microsoft.com/xrm/2011/Contracts/Services\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\">",
     "<request i:type=\"a:RetrieveAttributeRequest\" xmlns:a=\"https://schemas.microsoft.com/xrm/2011/Contracts\">",
      "<a:Parameters xmlns:b=\"http://schemas.datacontract.org/2004/07/System.Collections.Generic\">",
       "<a:KeyValuePairOfstringanyType>",
        "<b:key>EntityLogicalName</b:key>",
         entityLogicalNameValueNode,
       "</a:KeyValuePairOfstringanyType>",
       "<a:KeyValuePairOfstringanyType>",
        "<b:key>MetadataId</b:key>",
        "<b:value i:type=\"ser:guid\"  xmlns:ser=\"https://schemas.microsoft.com/2003/10/Serialization/\">" + _xmlEncode(MetadataId) + "</b:value>",
       "</a:KeyValuePairOfstringanyType>",
        "<a:KeyValuePairOfstringanyType>",
        "<b:key>RetrieveAsIfPublished</b:key>",
      "<b:value i:type=\"c:boolean\" xmlns:c=\"http://www.w3.org/2001/XMLSchema\">" + _xmlEncode(RetrieveAsIfPublished.toString()) + "</b:value>",
       "</a:KeyValuePairOfstringanyType>",
       "<a:KeyValuePairOfstringanyType>",
        "<b:key>LogicalName</b:key>",
         logicalNameValueNode,
       "</a:KeyValuePairOfstringanyType>",
      "</a:Parameters>",
      "<a:RequestId i:nil=\"true\" />",
      "<a:RequestName>RetrieveAttribute</a:RequestName>",
     "</request>",
    "</Execute>",
   "</soapenv:Body>",
  "</soapenv:Envelope>"].join("");
  var req = new XMLHttpRequest();
  req.open("POST", _getUrl() + "/XRMServices/2011/Organization.svc/web", true);
      try { req.responseType = 'msxml-document'} catch(e){}
  req.setRequestHeader("Accept", "application/xml, text/xml, */*");
  req.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
  req.setRequestHeader("SOAPAction", "https://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/Execute");
  req.onreadystatechange = function () {
   if (req.readyState == 4 /* complete */) {
   req.onreadystatechange = null; //Addresses potential memory leak issue with IE
    if (req.status == 200) {
     //Success
     var doc = req.responseXML;
     try{_setSelectionNamespaces(doc);}catch(e){}
     var a = _objectifyNode(_selectSingleNode(doc, "//b:value"));

     successCallBack(a, passThroughObject);
    }
    else {
     //Failure
     errorCallBack(_getError(req));
    }
   }
  };
  req.send(request);


 };

 this.EntityFilters = function () {
  /// <summary>SDK.Metadata.EntityFilters enum summary</summary>
  /// <field name="Default" type="Number" static="true">enum field summary for Default</field>
  /// <field name="Entity" type="Number" static="true">enum field summary for Entity</field>
  /// <field name="Attributes" type="Number" static="true">enum field summary for Attributes</field>
  /// <field name="Privileges" type="Number" static="true">enum field summary for Privileges</field>
  /// <field name="Relationships" type="Number" static="true">enum field summary for Relationships</field>
  /// <field name="All" type="Number" static="true">enum field summary for All</field>
  throw new Error("Constructor not implemented this is a static enum.");
 };



 var _arrayElements = ["Attributes",
  "ManyToManyRelationships",
  "ManyToOneRelationships",
  "OneToManyRelationships",
  "Privileges",
  "LocalizedLabels",
  "Options",
  "Targets"];

  function _getError(resp) {
  ///<summary>
  /// Private function that attempts to parse errors related to connectivity or WCF faults.
  ///</summary>
  ///<param name="resp" type="XMLHttpRequest">
  /// The XMLHttpRequest representing failed response.
  ///</param>

  //Error descriptions come from https://support.microsoft.com/kb/193625
  if (resp.status == 12029)
  { return new Error("The attempt to connect to the server failed."); }
  if (resp.status == 12007)
  { return new Error("The server name could not be resolved."); }
  var faultXml = resp.responseXML;
  var errorMessage = "Unknown (unable to parse the fault)";
  if (typeof faultXml == "object") {

   var faultstring = null;
   var ErrorCode = null;

   var bodyNode = faultXml.firstChild.firstChild;

   //Retrieve the fault node
   for (var i = 0; i < bodyNode.childNodes.length; i++) {
    var node = bodyNode.childNodes[i];

    //NOTE: This comparison does not handle the case where the XML namespace changes
    if ("s:Fault" == node.nodeName) {
     for (var j = 0; j < node.childNodes.length; j++) {
      var testNode = node.childNodes[j];
      if ("faultstring" == testNode.nodeName) {
       faultstring = _getNodeText(testNode);
      }
      if ("detail" == testNode.nodeName) {
       for (var k = 0; k < testNode.childNodes.length; k++) {
        var orgServiceFault = testNode.childNodes[k];
        if ("OrganizationServiceFault" == orgServiceFault.nodeName) {
         for (var l = 0; l < orgServiceFault.childNodes.length; l++) {
          var ErrorCodeNode = orgServiceFault.childNodes[l];
          if ("ErrorCode" == ErrorCodeNode.nodeName) {
           ErrorCode = _getNodeText(ErrorCodeNode);
           break;
          }
         }
        }
       }

      }
     }
     break;
    }

   }
  }
  if (ErrorCode != null &amp;&amp; faultstring != null) {
   errorMessage = "Error Code:" + ErrorCode + " Message: " + faultstring;
  }
  else {
   if (faultstring != null) {
    errorMessage = faultstring;
   }
  }
  return new Error(errorMessage);
 };

 function _Context() {
  var errorMessage = "Context is not available.";
  if (typeof GetGlobalContext != "undefined")
  { return GetGlobalContext(); }
  else {
   if (typeof Xrm != "undefined") {
    return Xrm.Page.context;
   }
   else
   { return new Error(errorMessage); }
  }
 };

 function _getUrl() {
     var url = _Context().getClientUrl();
  return url;
 };

 function _evaluateEntityFilters(EntityFilters) {
  var entityFilterArray = [];
  if ((1 &amp; EntityFilters) == 1) {
   entityFilterArray.push("Entity");
  }
  if ((2 &amp; EntityFilters) == 2) {
   entityFilterArray.push("Attributes");
  }
  if ((4 &amp; EntityFilters) == 4) {
   entityFilterArray.push("Privileges");
  }
  if ((8 &amp; EntityFilters) == 8) {
   entityFilterArray.push("Relationships");
  }
  return entityFilterArray.join(" ");
 };

 function _isMetadataArray(elementName) {
  for (var i = 0; i < _arrayElements.length; i++) {
   if (elementName == _arrayElements[i]) {
    return true;
   }
  }
  return false;
 };

 function _objectifyNode(node) {
  //Check for null
  if (node.attributes != null &amp;&amp; node.attributes.length == 1) {
   if (node.attributes.getNamedItem("i:nil") != null &amp;&amp; node.attributes.getNamedItem("i:nil").nodeValue == "true") {
    return null;
   }
  }

  //Check if it is a value
  if ((node.firstChild != null) &amp;&amp; (node.firstChild.nodeType == 3)) {
   var nodeName = _getNodeName(node);

   switch (nodeName) {
    //Integer Values 
    case "ActivityTypeMask":
    case "ObjectTypeCode":
    case "ColumnNumber":
    case "DefaultFormValue":
    case "MaxValue":
    case "MinValue":
    case "MaxLength":
    case "Order":
    case "Precision":
    case "PrecisionSource":
    case "LanguageCode":
     return parseInt(node.firstChild.nodeValue, 10);
     // Boolean values
    case "AutoRouteToOwnerQueue":
    case "CanBeChanged":
    case "CanTriggerWorkflow":
    case "IsActivity":
    case "IsAIRUpdated":
    case "IsActivityParty":
    case "IsAvailableOffline":
    case "IsChildEntity":
    case "IsCustomEntity":
    case "IsCustomOptionSet":   
    case "IsDocumentManagementEnabled":
    case "IsEnabledForCharts":
    case "IsGlobal":
    case "IsImportable":
    case "IsIntersect":
    case "IsManaged":
    case "IsReadingPaneEnabled":
    case "IsValidForAdvancedFind":
    case "CanBeSecuredForCreate":
    case "CanBeSecuredForRead":
    case "CanBeSecuredForUpdate":
    case "IsCustomAttribute":
    case "IsManaged":
    case "IsPrimaryId":
    case "IsPrimaryName":
    case "IsSecured":
    case "IsValidForCreate":
    case "IsValidForRead":
    case "IsValidForUpdate":
    case "IsCustomRelationship":
    case "CanBeBasic":
    case "CanBeDeep":
    case "CanBeGlobal":
    case "CanBeLocal":
     return (node.firstChild.nodeValue == "true") ? true : false;
     //OptionMetadata.Value and BooleanManagedProperty.Value and AttributeRequiredLevelManagedProperty.Value
    case "Value":
     //BooleanManagedProperty.Value
     if ((node.firstChild.nodeValue == "true") || (node.firstChild.nodeValue == "false")) {
      return (node.firstChild.nodeValue == "true") ? true : false;
     }
     //AttributeRequiredLevelManagedProperty.Value
     if (
  (node.firstChild.nodeValue == "ApplicationRequired") ||
  (node.firstChild.nodeValue == "None") ||
  (node.firstChild.nodeValue == "Recommended") ||
  (node.firstChild.nodeValue == "SystemRequired")
  ) {
      return node.firstChild.nodeValue;
     }
     var numberValue = parseInt(node.firstChild.nodeValue, 10);
     if (isNaN(numberValue)) {
         //FormatName.Value
         return node.firstChild.nodeValue;
     }
     else {
         //OptionMetadata.Value
         return numberValue;
     }
     break;
    //String values 
    default:
     return node.firstChild.nodeValue;
   }

  }

  //Check if it is a known array
  if (_isMetadataArray(_getNodeName(node))) {
   var arrayValue = [];

   for (var i = 0; i < node.childNodes.length; i++) {
    var objectTypeName;
    if ((node.childNodes[i].attributes != null) &amp;&amp; (node.childNodes[i].attributes.getNamedItem("i:type") != null)) {
     objectTypeName = node.childNodes[i].attributes.getNamedItem("i:type").nodeValue.split(":")[1];
    }
    else {

     objectTypeName = _getNodeName(node.childNodes[i]);
    }

    var b = _objectifyNode(node.childNodes[i]);
    b._type = objectTypeName;
    arrayValue.push(b);

   }

   return arrayValue;
  }

    //Null entity description labels are returned as <label/> - not using i:nil = true;
  if(node.childNodes.length == 0)
  {
  return null;
  }

  //Otherwise return an object
  var c = {};
  if (node.attributes.getNamedItem("i:type") != null) {
   c._type = node.attributes.getNamedItem("i:type").nodeValue.split(":")[1];
  }
  for (var i = 0; i < node.childNodes.length; i++) {
   if (node.childNodes[i].nodeType == 3) {
    c[_getNodeName(node.childNodes[i])] = node.childNodes[i].nodeValue;
   }
   else {
    c[_getNodeName(node.childNodes[i])] = _objectifyNode(node.childNodes[i]);
   }

  }
  return c;
 };

 function _selectNodes(node, XPathExpression) {
  if (typeof (node.selectNodes) != "undefined") {
   return node.selectNodes(XPathExpression);
  }
  else {
   var output = [];
   var XPathResults = node.evaluate(XPathExpression, node, _NSResolver, XPathResult.ANY_TYPE, null);
   var result = XPathResults.iterateNext();
   while (result) {
    output.push(result);
    result = XPathResults.iterateNext();
   }
   return output;
  }
 };

 function _selectSingleNode(node, xpathExpr) {
  if (typeof (node.selectSingleNode) != "undefined") {
   return node.selectSingleNode(xpathExpr);
  }
  else {
   var xpe = new XPathEvaluator();
   var xPathNode = xpe.evaluate(xpathExpr, node, _NSResolver, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
   return (xPathNode != null) ? xPathNode.singleNodeValue : null;
  }
 };

 function _selectSingleNodeText(node, xpathExpr) {
  var x = _selectSingleNode(node, xpathExpr);
  if (_isNodeNull(x))
  { return null; }
  if (typeof (x.text) != "undefined") {
   return x.text;
  }
  else {
   return x.textContent;
  }
 };

 function _getNodeText(node) {
  if (typeof (node.text) != "undefined") {
   return node.text;
  }
  else {
   return node.textContent;
  }
 };

 function _isNodeNull(node) {
  if (node == null)
  { return true; }
  if ((node.attributes.getNamedItem("i:nil") != null) &amp;&amp; (node.attributes.getNamedItem("i:nil").value == "true"))
  { return true; }
  return false;
 };

 function _getNodeName(node) {
  if (typeof (node.baseName) != "undefined") {
   return node.baseName;
  }
  else {
   return node.localName;
  }
 };

 function _setSelectionNamespaces(doc)
 {
 var namespaces = [
 "xmlns:s='https://schemas.xmlsoap.org/soap/envelope/'",
 "xmlns:a='https://schemas.microsoft.com/xrm/2011/Contracts'",
 "xmlns:i='http://www.w3.org/2001/XMLSchema-instance'",
 "xmlns:b='http://schemas.datacontract.org/2004/07/System.Collections.Generic'",
 "xmlns:c='https://schemas.microsoft.com/xrm/2011/Metadata'" 
 ];
 doc.setProperty("SelectionNamespaces",namespaces.join(" "));

 }

 function _NSResolver(prefix) {
  var ns = {
   "s": "https://schemas.xmlsoap.org/soap/envelope/",
   "a": "https://schemas.microsoft.com/xrm/2011/Contracts",
   "i": "http://www.w3.org/2001/XMLSchema-instance",
   "b": "http://schemas.datacontract.org/2004/07/System.Collections.Generic",
   "c": "https://schemas.microsoft.com/xrm/2011/Metadata"
  };
  return ns[prefix] || null;
 };

 function _xmlEncode(strInput) {
  var c;
  var XmlEncode = '';
  if (strInput == null) {
   return null;
  }
  if (strInput == '') {
   return '';
  }
  for (var cnt = 0; cnt < strInput.length; cnt++) {
   c = strInput.charCodeAt(cnt);
   if (((c > 96) &amp;&amp; (c < 123)) ||
            ((c > 64) &amp;&amp; (c < 91)) ||
            (c == 32) ||
            ((c > 47) &amp;&amp; (c < 58)) ||
            (c == 46) ||
            (c == 44) ||
            (c == 45) ||
            (c == 95)) {
    XmlEncode = XmlEncode + String.fromCharCode(c);
   }
   else {
    XmlEncode = XmlEncode + '&amp;#' + c + ';';
   }
  }
  return XmlEncode;
 };

}).call(SDK.Metadata);

//SDK.Metadata.EntityFilters
// this enum is written this way to enable Visual Studio IntelliSense
SDK.Metadata.EntityFilters.prototype = {
 Default: 1,
 Entity: 1,
 Attributes: 2,
 Privileges: 4,
 Relationships: 8,
 All: 15
};
SDK.Metadata.EntityFilters.Default = 1;
SDK.Metadata.EntityFilters.Entity = 1;
SDK.Metadata.EntityFilters.Attributes = 2;
SDK.Metadata.EntityFilters.Privileges = 4;
SDK.Metadata.EntityFilters.Relationships = 8;
SDK.Metadata.EntityFilters.All = 15;
SDK.Metadata.EntityFilters.__enum = true;
SDK.Metadata.EntityFilters.__flags = true;

另请参阅

演练：与 JavaScript 结合使用现代应用程序 SOAP 终结点
 与 Web 资源一同使用现代应用程序的现代应用程序 SOAP 终结点
 使用 Web 资源（OData 和现代应用程序 SOAP 终结点）中的 Web 服务数据
 技术文章：将选项集选项与 REST 端点结合使用 - JScript

通过

示例：使用 JavaScript 检索实体元数据

要求

演示

示例

示例

另请参阅

其他资源