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Form Validation

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Jun 19.2007

I have some form validation done, but it’s not very good. How do i make sure that users can only use a-z, A-Z, 0-9. (there for users would not be able to use special characters) – note: i have the php server side validation done but i want javascript also, thanks

Here is the code i have so far:

[code=html]function validate_username(field,alerttxt)
{
with (field)
{
numofchar=value.length;
if (numofchar<5)
{alert(alerttxt);return false}
else {return true}
}
}[/code]

[code=html]function validate_form(thisform)
{
with (thisform)
{

if (validate_username(username,”Ooops… Username must be at least 5 characters in length”)==false)
{username.focus();return false}[/code]

how can i make sure that the $username only can have a-z, A-Z, 0-9

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JavaScript

1 Comments(s) ↴

Copy linkTweet thisAlerts:
@samanyoluJun 19.2007 —  <br/>
&lt;script type="text/javascript"&gt;

function check(){

var el = document.getElementById('inputid');
var re = /^[a-zA-Z0-9]{5,}$/
if(re.test(el.value)) { alert("okey");return true; }
if(!re.test(el.value)) { alert(" not okey"); el.focus() ; return false; }
}

&lt;/script&gt;
&lt;input type="text" id="inputid" onchange="check()"&gt;
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