Validate form text box with javascript. Numeric and not blank.

Posted on 2016-08-10
Last Modified: 2016-08-11
I have a form text box that I need to validate. I need to validate that a number greater than zero is entered and it cannot be blank.

I thought they would be easy, but my script constantly fails.

Can someone assist? Thank you.

I am sending the number to the script like this:

<input type="button" id="myNumber" name="Submit" value="Submit" onclick="execute(document.getElementById('myNumber').value);">
Question by:earwig75
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Expert Comment

by:Mukesh Yadav
ID: 41750349
Can you please share code for function execute?

Author Comment

ID: 41750362

My method was not working, so I gave up and deleted it.

Expert Comment

by:Mukesh Yadav
ID: 41750381
So number should me minimum 1.

<input type="button" id="myNumber" name="Submit" value="Submit" onclick="validate();">

function validate(){
    var element = document.getElementById('myNumber');
    if(parseInt(element.value) < 1){
        element.value = 1;

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Expert Comment

ID: 41750448
which browsers are you supporting? because html5 has a pattern attribute on the input tag

Author Comment

ID: 41750534
I need to support old browsers and ONLY allow numeric inputs. I think Mukesh's solution would allow letters and numbers.
LVL 10

Accepted Solution

Paweł earned 500 total points
ID: 41750535
try this using regex in javascirpt

this will work with older browsers, not sure how far back, and it'll restrict to just numbers

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