validate text box

seethal

how to validate a text box compare with the values stored in an array. the text box is for username.

Aug 14 '12 #1

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Expert Mod 4TB

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.

Aug 14 '12 #2

ariful alam

185

100+

Try the below code.

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 <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. :)

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