JAVASCRIPT

Working with IFRAME in JavaScript

This article starts by explaining the differences between FRAME, FRAMESET, and IFRAME and concludes with the concept of using JavaScript with IFRAME.

Author Info:

By: Jagadish Chaterjee

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March 01, 2006

TABLE OF CONTENTS:

The two previous sections demonstrated how to write content dynamically to an IFRAME. But the example I showed you earlier may not be suited for real-world requirements. Now, I would like to present you with another, better example, which could be really helpful! Let us have a look at the following code.

<html>
      <head>
            <meta name=vs_targetSchema content="http://schemas.microsoft.com/intellisense/ie5">
<script id="clientEventHandlersJS" language="javascript">
<!--
function Show()
{
      // get our iframe
        var testFrame = document.getElementById("myFrame");
            var val;
            val = "<TABLE border=1>";
            val += "<TR><TD>SlNo</TD><TD>Name</TD></TR>";
            val += "<TR><TD>1</TD><TD>Jag</TD></TR>";
            val += "<TR><TD>2</TD><TD>Chat</TD></TR>";
            val += "<TR><TD>3</TD><TD>Win</TD></TR>";
            val += "<TR><TD>4</TD><TD>Dhan</TD></TR>";
            val += "</TABLE>";
        // now write out the new contents
        var doc = testFrame.contentDocument;
        if (doc == undefined || doc == null)
            doc = testFrame.contentWindow.document;
        doc.open();
        doc.write(val);
        doc.close();

document.all.myFrame.style.visibility="visible";
}

function Button1_onclick() {
Show();
}
//-->
            </script>
      </head>
      <body>
      <iframe id="myFrame" frameborder="0" vspace="0" hspace="0" marginwidth="0"
marginheight="0" width="100" scrolling=yes height="100"
style="BORDER-RIGHT: black 1px solid; BORDER-TOP: black 1px solid; Z-INDEX: 999; LEFT: 20px; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid; POSITION: absolute; TOP: 100px; visibility:hidden;"></iframe>

Within the above code, the only important issue is the following:

            var val;
            val = "<TABLE border=1>";
            val += "<TR><TD>SlNo</TD><TD>Name</TD></TR>";
            val += "<TR><TD>1</TD><TD>Jag</TD></TR>";
            val += "<TR><TD>2</TD><TD>Chat</TD></TR>";
            val += "<TR><TD>3</TD><TD>Win</TD></TR>";
            val += "<TR><TD>4</TD><TD>Dhan</TD></TR>";
            val += "</TABLE>";

A new variable, “val,” is defined, which can contain any string (including any HTML). You can observe that I concatenated some HTML script (which forms a TABLE) to the same variable. Now, this variable is directly written to IFRAME, which makes you to see a dynamic TABLE in an IFRAME!

Any comments, suggestions, ideas, improvements, bugs, errors, feedback etc. are highly appreciated at jag_chat@yahoo.com.

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