String length validation in javascript

Question

I have a small problem with a task I've been asigned. I'm trying to make an alert message appear if the length of the inputted number does not equal 7. The message appears even if the length of the number is equal to 7 and I can't figure out why, any help would be appreciated! thanks.

var msg = "";

if (document.Entry.Number.length!== 7) {
            msg+="Your Number should be 7 digits. Please check this. \n";
            document.Entry.Number.focus();
            document.getElementById('Number').style.color="red";
            result = false;
        }
        if(msg==""){
            return result;
        }

        {
            alert(msg)
            return result;
        }

Ashis Kumar · Accepted Answer · 2013-09-14 17:24:36Z

4

You can use document.Entry.Number.value.length in the if condition,

var msg = "";

if (document.Entry.Number.value.length!== 7) {
            msg+="Your Number should be 7 digits. Please check this. \n";
            document.Entry.nNumber.focus();
            document.getElementById('Number').style.color="red";
            result = false;
        }
        if(msg==""){
            return result;
        }

        {
            alert(msg)
            return result;
        }

edited Sep 14, 2013 at 17:24

answered Sep 14, 2013 at 17:07

Ashis Kumar

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1 Comment

user2696190 Over a year ago

got it to work just by adding a .value before the length in the original script. Thanks for your help!

Community · Accepted Answer · 2017-05-23 12:18:15Z

0

That should work:

if (document.Entry.Number.toString().length!== 7) {

If document.Entry.Number is a number, you'll have to convert it to a string to find out the length. (Ref Length of Number in JavaScript)

edited May 23, 2017 at 12:18

CommunityBot

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answered Sep 14, 2013 at 17:05

Lorenz

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2 Comments

user2696190 Over a year ago

Thank you for the quick reply! I'll remember that in future. However I'm still receiving the alert after editing that. Hmm, any more suggestions?

Lorenz Over a year ago

Then alert document.Entry.Number or try trim()

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