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validate a textfield help

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Jan 06.2007

do u know how to validate a textfield so that it only accepts letters?

THX

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JavaScript

3 Comments(s) ↴

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@mrhooJan 06.2007 — This expression returns true or false based on the textboxvalue:

var isonlyletters= /^[a-z]+$/i.test(textboxvalue)

Or, this code prevents anything that isn't an English letter being allowed in the textbox:

[CODE] mytextbox.onkeyup= function(){
var txt= mytextbox.value;
txt= txt.replace(/[^a-zA-Z]/g,'');
mytextbox.value= txt;
}[/CODE]
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@samanyoluJan 06.2007 —  <br/>
&lt;html&gt;
&lt;head&gt;
&lt;script type="text/javascript"&gt;

function verifyAlpha(){

var e = document.getElementById('text');

if (!/^[a-zA-Zs]+$/.test(e.value)) { e.value = e.value.substring(0,e.value.length-1);}
}

&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;

Some alpha: &lt;textarea id="text" onkeyup="verifyAlpha()"&gt;&lt;/textarea&gt;



&lt;/body&gt;
&lt;/html&gt;
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@forty2Jan 06.2007 — <i>
</i>&lt;html&gt;
&lt;head&gt;
&lt;script type="text/javascript"&gt;
function CheckValue(e){
e=(window.event) ? event : e;
return (/[a-zsb]/i.test(String.fromCharCode(e.keyCode)));
} <br/>
&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;textarea onkeydown="return CheckValue(event)"&gt;&lt;/textarea&gt;
&lt;/body&gt;
&lt;/html&gt;
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