Freigeben über

position property

  • Artikel

Returns the quotient of value/max when the value attribute is set (determinate progress bar), or -1 when the value attribute is missing (indeterminate progress bar).

This property is read-only.

 

Syntax

HRESULT get_position(
  [out] float *fValue
);

Property values

Type: float

If determinate, returns the result of the current value divided by the maximum value, otherwise -1.

Standards information

Remarks

When the value attribute is omitted from a progress element, the element is indeterminate. The progress element shows activity, but not how much progress has actually been made.

If the value attribute is used without a max value, the range is from 0 to 1.

The following example displays the current value of the IHTMLProgressElement::position property when the progress bar is changed.

<html>
<head>
    <title>Progress bar example</title>
    <style type="text/css">
    #pbar
    {
        /* style the progress bar */
        border: 1px solid black;
        color: Blue;
        background-color:Yellow;
        }
    </style>

    <script type="text/javascript">
        function goingUp() {
            // add 5% to value
            var pBar = document.getElementById("pbar");
            if (pBar.value <= (pBar.max - 5)) {
                pbar.value += 5;
            }
            checkStatus();
        }

        function checkStatus() {
            // Shows position and value
            // -1 for indeterminate, otherwise current value divided by max.
            var pBar = document.getElementById("pbar");
            document.getElementById("positionStatus").innerHTML = "Value: " + pBar.value;
            document.getElementById("positionStatus").innerHTML += "<br/>Position: " + pBar.position.toFixed(3);
        }

        function toggle() {
            var pBar = document.getElementById("pbar");
            if (pBar.hasAttribute("value")) {
                //  Removing the value attribute makes the progress bar indeterminate
                pBar.removeAttribute("value");
                document.getElementById("tgl").innerHTML = "Make determinate";
            } else {
                //  Setting the value attribute makes the progress bar determinate
                pBar.value = 5;
                document.getElementById("tgl").innerHTML = "Make indeterminate";
            }
            checkStatus();
        }

</script>
</head>
<body onload="checkStatus();">
<h1>Progress bar test</h1>
  <p>Click Up to change to a determinate bar and use buttons move the progress up or down by 5% increments.</p>
  <div>
    <label id="progLabel">Progress: <progress id="pbar" max="100">Put alternate display here</progress></label>
    <button onclick="goingUp();">Up</button>
    <button id= "tgl" onclick="toggle();">Make determinate</button>
</div>
<div id="positionStatus"></div>
</body>
</html>