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Test <input> field length


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Isn't this code correct? 
I'm trying to test for the length of an input field when submit is clicked. 

function formcheck() 
{if(stdcd.value.length < 9){alert(\"MUST BE 9 CHARACTERS.\");return false;}
return true;} 


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The variable "stdcd" is not defined, you need to assign an input element to it before you can use it. You can access an element using one of many DOM methods such as getElementById() or querySelector()

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  • 3 months later...

Hello, @mickeymouse

Try this code : 

        function countlength() {
            var textval = document.getElementById("val");
            if (textval.value.length < 9) {
                alert("MUST BE 9 CHARACTERS." + "\n\nYour input characters length is :- " + textval.value.length);
                return false;
            return true;
    <title>Input value length checked</title>

    <h2>Input value length checked</h2>
    <input type="text" name="val" id="val" />
    <br /><br />
    <input type="submit" value="Submit" name="Submit" onclick="countlength()" />

I hope above code will be useful for you.
Thank you.

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  • 4 weeks later...

Try this way

<input type="text" id="txtName" name="usrname" >
<input type="submit" value="Submit" name="Submit" onclick="chklength()" />

  function chklength()
    var name=$("#txtName").val();
    if(name.length < 9){
    alert("Name must be nine characters ");
Edited by AjayGohil
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