Know the length of an input in Javascript

Question

how to know the length of an input in Javascript

alert("Size: "+document.getElementById('champ').length)

not work undefined

Pointy · Accepted Answer · 2010-07-29 11:32:28Z

11

alert("Size: "+document.getElementById('champ').value.length)

You have to pluck the "value" attribute from the DOM element, and get the length of that.

answered Jul 29, 2010 at 11:32

Pointy

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Pavel Strakhov · Accepted Answer · 2010-07-29 11:48:20Z

1

<input type='text' id='champ' length=3 value="ab">

document.getElementById("champ").getAttribute("length")
//returns 3

document.getElementById("champ").value.length
//returns 2

answered Jul 29, 2010 at 11:48

Pavel Strakhov

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