Resize iframe height dynamically

Posted on 2008-10-26
Last Modified: 2013-11-19
My website currently uses two iframes in the left menu navigation bar. Their heights are too large so I cannot fit anything else there but those two. I want them started out collapsed at a defined height (~ 250 px) when the page is loaded. Then I want to give user option to expand (by clicking on + sign). When + sign is clicked, iframe should expand. Then, + sign should change to - sign and use can click on it to collapse back to previous height. I have looked all the previous questions but did not find exact solution I need. Could you help? Suggested solution should work in IE, Netscape and Firefox browsers.

Question by:shwekhaw
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Accepted Solution

bluV11t earned 500 total points
ID: 22806697
I used to gif's for plus and minus but if you want to use links and + - link text let me know.
Try this:
//I the head tag:
<script language=javascript>
function fnToggle(framename, buttonname){
    if (document.getElementById(buttonname).name=='small'){
    //iframe closed
    document.getElementById(buttonname).src = 'plus.gif';
    document.getElementById(buttonname).name = 'big';
    //iframe open
    document.getElementById(buttonname).src = 'minus.gif';
    document.getElementById(buttonname).name = 'small';
//Iframes and buttons:
<IMG src="plus.gif" id="expButton" name="small" onclick="fnToggle('firstframe', 'expButton');"><br />
<iframe id="firstframe" height=250 width=200></iframe>
<IMG src="plus.gif" id="expButton2" name="small" onclick="fnToggle('secondframe', 'expButton2');"><br />
<iframe id="secondframe" height=250 width=200></iframe>

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Author Comment

ID: 22807923
It is great. Just one thing. I tried to put the plus and minus sign image below iframe tage so they would appear at the bottom corner of the table box. Like this
<iframe id="secondframe" height=250 width=200></iframe>
<IMG src="plus.gif" id="expButton2" name="small" onclick="fnToggle('secondframe', 'expButton2');"><br />
 However, image does not appear. I think image is hidden behind the iframe. Is it possible to position image in such location?

Expert Comment

ID: 22808581
Shouldn't be a problem but if the tables are styled with somthing like overflow:hidden that could easily hide the gif.  

Author Comment

ID: 22808674
I just placed image inside separate <tr> tag. Thanks for the solution.

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