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Pass Select Option's Value to a Textbox in Iframe

FrankTech asked
Last Modified: 2012-05-05
On my main page is a select box, that is not in a form (there is no <form> element on the main page):

        <select name="select1" id="select1">
          <option value="A">A</option>
          <option value="B">B</option>
          <option value="C">C</option>

That page contains an iframe named "if1" and id="if1".

The iframe contains a textbox (named "textfield" and id="textfield").

The main page and the page in the iframe are both on my own domain.

When the user changes the Select Option, the value should be passed into the textbox in the iframe.

I tried this, but it gives an error ("is null or not an object"):

     <select onChange="window.frames[if1].document.formiframe.textfield.value=this.options[this.selectedIndex].value;">

So how can I reference and pass values to the textbox inside the iframe ?
Main Page:
  <select name="select1" id="select1" onChange="window.frames[if1].document.form2.textfield.value=this.options[this.selectedIndex].value;">
    <option value="">Choose</option>
    <option value="A">A</option>
    <option value="B">B</option>
    <option value="C">C</option>
<iframe name="if1" id="if1" src="pageForIframe.php"></iframe>
Code of Other Page Inside Iframe:
<form name="form2" id="form2" method="post" action="#">
<input type="text" id="textbox" name="textbox">

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