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Join Date: Nov 2006
Posts: 8
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Newbie Poster
help in validation by javascript hi
i make textarea for user to insert your comment on topic and press submit to enter comment in database , problem i want to privant user to write empty string and press submit to enter it in database and i want to make this validation on textarea or submit button.
i make textarea for user to insert your comment on topic and press submit to enter comment in database , problem i want to privant user to write empty string and press submit to enter it in database and i want to make this validation on textarea or submit button.
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Join Date: Apr 2007
Location: Birmingham
Posts: 368
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Posting Whiz
here you go
obviously it will work the same with a textarea but i just ripped it out of some of my own code. hope this helps
<script type='text/javascript'>
function isEmpty(elem, errMsg){
if(elem.value.length == 0){
alert(errMsg);
elem.focus();
return true;
}
return false;
}
</script>
<form>
Name : <input type='text' id='name'/>
<input type='button'
onclick="isEmpty(document.getElementById('name'), 'Please Enter a Value')"
value='Check Field' />
</form>obviously it will work the same with a textarea but i just ripped it out of some of my own code. hope this helps
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Join Date: Jul 2006
Location: Deptford, London
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Posting Shark
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Originally Posted by Fungus1487
<input type='button' onclick="isEmpty(document.getElementById('name'), 'Please Enter a Value')" value='Check Field' />
that won't validate on submit, it'll validate, but not submit. if you want to validate, you have to conditionally stop the submit, which is done by returning false within an onsubmit event. the function is right, but the call to it is not making full use of its potential.
keeping your function Fungus1487; try:
[incorrect]
EDIT:
I tell a lie! onsubmit is a form event not a submit button event:
<form action="anactionhandler.cgi" method="GET" onsubmit="return ! isEmpty(document.getElementById('name'),
'Please Enter a Value')">
Name : <input type='text' id='name'/>
<input type='submit' value='Submit!' />
</form> Last edited by MattEvans : Apr 30th, 2007 at 6:53 am.
If it only works in Internet Explorer; it doesn't work.
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Join Date: Apr 2007
Location: Birmingham
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Posting Whiz
sorry, my mistake
When Autumn Falls [ http://www.whenautumnfalls.co.uk ] &&
Designdotworks [ http://www.designdotworks.co.uk ] Web / Graphic / Software Design
Designdotworks [ http://www.designdotworks.co.uk ] Web / Graphic / Software Design
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