validate text box

**gits** · Aug 14 '12, 07:25 AM

what do you have done so far? please post your code. Basicly you need to decide when the validation should be executed - so find an event where you register the validation handler and where you then implement the validation logic.

**ariful alam** · Aug 14 '12, 08:02 AM

Try the below code.

Code:

<html>
<head>
<title>check array contains</title>
<script language="JavaScript">

var ids=new Array("name1","name2","name3");

function validate(userid)
{
	if(userid=="") {
		alert('user id is not given.');
	}
	else if(contains(ids,userid)) {
		document.getElementById('msg').innerHTML="<b>"+userid+"</b> found.";
	}else{
 		document.getElementById('msg').innerHTML="<b>"+userid+"</b> not found.";
	}
}

// contains function
function contains(arr, findValue) {
    var i = arr.length;

    while (i--) {
        if (arr[i] === findValue) return true;
    }
    return false;
}

</script>
</head>

<body>

<div id='msg'></div>
<label>User ID: <input type='text' size='30' id='userid' name='userid' placeholder='please enter your id'/></label>
<input type='submit' name='login' value='check' onclick="javascript:validate(document.getElementById('userid').value);"/>

</body>
</HTML>

hope it's help you. :)

validate text box

validate text box

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