top property

發行項
05/02/2017

Sets or retrieves the position of the object relative to the top of the next positioned object in the document hierarchy.

Syntax

Integer value = object.put_top(Variant v);Integer value = object.get_top(Variant* sTop);

Property values

Type: VARIANT

one of the values listed in Possible Values.

auto (auto)

Default. Default position according to the regular HTML layout of the document.

length (length)

Floating-point number, followed by an absolute units designator (cm, mm, in, pt, or pc) or a relative units designator (em, ex, or px). For more information about the supported length units, see CSS Values and Units Reference.

percentage (percentage)

Integer, followed by a percent sign (%). This value is a percentage of the height of the parent object.

String format

<length> | <percentage> | auto

CSS information

Applies To	All elements
Media	visual
Inherited	no
Initial Value	auto

Standards information

CSS 2.1, Section 9.3.2

Remarks

The IHTMLCurrentStyle::top attribute should be used only when the IHTMLCurrentStyle::position attribute is set; otherwise, the value of the IHTMLCurrentStyle::top attribute is ignored.

Because the value of the IHTMLCurrentStyle::top property is a string, you cannot use the property to calculate the position of the object in the document.

For more information about how to access the dimension and location of objects on the document through the Dynamic HTML (DHTML) Document Object Model (DOM), see Measuring Element Dimension and Location with CSSOM in Internet Explorer 9.

Examples

The following example uses the IHTMLCurrentStyle::top property to change the position of the green div. In the example below, there are four div elements with absolute positioning. The green div is positioned 50 pixels from the top.

Code example: http://samples.msdn.microsoft.com/workshop/samples/css/positioning/positioning.html

#green {            
   height: 175px;
   width: 175px;
   background-color: #7FBA00;
   position: absolute;
   top: 50px;
}

This example uses inline script to change the position of the image set by an inline style. The change occurs during HTMLFrameSiteEvents::onmouseover and HTMLFrameSiteEvents::onmouseout events.

Code example: http://samples.msdn.microsoft.com/workshop/samples/author/dhtml/refs/top_s.htm

<img src="cone.jpg" style="position:absolute; top:80px;" 
  onmouseover="this.style.top='100px''"    
  onmouseout="this.style.top='80px'">

Requirements

Minimum supported client	Windows XP
Minimum supported server	Windows Server 2003
Header	Mshtml.h
IDL	Mshtml.idl
DLL	Mshtml.dll

共用方式為