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Editorial Team
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Asked: 2026-05-26T13:10:54+00:00

I have a text area form like this one: <input id=sg_0 name=sjalfgefid type=text class=letur

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I have a text area form like this one: 

<input id="sg_0" name="sjalfgefid" type="text" class="letur hvitur" size="8" maxlength="40" value=""></td>

and a Checkbox next to it:

<input type="Checkbox" id="cb0" name="innsent" tegund="val" gildi="eink" value="0" number="0" parents="1" onclick="hakaVid(this)">

I want the checkbox to be filled when some text is written in the text area. And when the user deletes all the text from the textbox, I want the checkbox to update immediately
How can I possibly do this ?

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1 Answer

  1. Editorial Team

    Attach an onKeyUp event handler to the <input> and modify the checkbox’s value according to this.value.length.

    <input id="sg_0" name="sjalfgefid" type="text" class="letur hvitur" 
       size="8" maxlength="40" value="" 
       onkeyup="document.getElementById('cb0').checked = this.value.length > 0;">

    Example: http://jsfiddle.net/qG5Cu/

    UPDATE You might be interested on using the onInput event handler instead of onkeyup. See this link for more information: Using the oninput event handler with onkeyup/onkeydown as its fallback

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