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Javascript dynamically changes the height of IFrame for automatic stretching

Source: Internet
Author: User
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Dynamically change the IFrame height to automatically extend IFrame, and automatically scale down the parent page.
Principle: when loading an IFrame sub-page, call the parent IFrame object to change its height.
Implementation 1:
1. On the IFrame page (subpage), add JavaScript
Copy codeThe Code is as follows:
<Script>
Function IFrameResize (){
// Alert(this.doc ument. body. scrollHeight); // The height of the current page is displayed.
Var obj = parent.doc ument. getElementById ("childFrame"); // get the IFrame object of the parent page
// Alert (obj. height); // The height set in IFrame on the parent page is displayed.
Obj. height = this.doc ument. body. scrollHeight; // adjust the IFrame height in the parent page to the height of this page.
}
</Script>

2. Add an onload event to the body of the IFrame page (that is, the Child page ).
Copy codeThe Code is as follows:
<Body onload = "IFrameResize ()">

3. Add an ID for the IFrame label of the parent page, that is, the childFrame written by row 2nd in the method body in the first step above.
Copy codeThe Code is as follows:
<IFRAME border = 0 marginWidth = 0
FrameSpacing = 0 marginHeight = 0
Src = "frame1.jsp" frameBorder = 0
NoResize scrolling = "no" width = 100% height = 100% vspale = "0" id = "childFrame"> </IFRAME>

Implementation 2:
Copy codeThe Code is as follows:
// Dynamically change the height of the parent class iframe
// Js called on the iframe page
$ (Function (){
// Obtain the window height
Var winH = $ (window). height ();
// Obtain the page height
Var bodyH = $ (document). height ();
If (bodyH> winH ){
Optional bytes parent.doc ument. getElementById ("mainFrame"). height = bodyH;
} Else {
Optional bytes parent.doc ument. getElementById ("mainFrame"). height = winH;
}
});

The iframe of the parent page is
Copy codeThe Code is as follows:
<Iframe src = "main. action" height = "700" frameborder = "0" width = "100%" id = "mainFrame" name = "mainFrame"> </iframe>

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