Question

157

rated 0 times [ 161] [ 4] / answers: 1 / hits: 92488 / 14 Years ago, fri, march 19, 2010, 12:00:00

How do I check if a textarea contains nothing?

I tried with this code:

if(document.getElementById("field").value ==null)

{

    alert("debug");

    document.getElementById("field").style.display ="none";

 }

But it doesn't do what I expect.
I expect that it should appear a messagebox "debug" and that the textarea is not shown.

How can I fix that issue?

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Member since Fri, May 7, 2021

3 Years ago

answered 15 Years ago ellisw · Accepted Answer

You wanna check if the value is == , not NULL.

if(document.getElementById(field).value == '')

{

    alert(debug);

    document.getElementById(field).style.display =none;

}

UPDATE

A working example

And another one using TRIM in case you wanna make sure they don't post spaces

Implementation for TRIM()

String.prototype.trim = function() {

  return this.replace(/^s+|s+$/g,);

}