What value passes from a form with checkbox to the java script

Question

I take a form and wants value of checkbox. such as:

<form method="post" onSubmit="return nameempty()">

<input name="checkn1" id="check1" type="checkbox" />
<input name="checkn2" id="check2" type="checkbox" />

<input type="submit" value="submit">
</form>

Now I want to know the values of checkbox when it is selected, and also when not selected.

Now I write javascript, and get that each checkbox has value "on" whether it is selected or not.

<script>
function nameempty()
{
alert(document.getElementById('check1').value);
alert(document.getElementById('check2').value);
}
</script>

How could I get 'on' when it is selected and anything else when not selected.

I am new in this line

user3129375
– user3129375

2014-02-02 11:32:38 +00:00
Commented Feb 2, 2014 at 11:32 — user3129375
– user3129375, Commented Feb 2, 2014 at 11:32

Pranav C Balan · Accepted Answer · 2014-02-02 11:28:04Z

1

use checked instead of value which will return true if the checkbox is checked or it will return false

<script>
function nameempty()
{
alert(document.getElementById('check1').checked);
alert(document.getElementById('check2').checked);
}
</script>

answered Feb 2, 2014 at 11:28

Pranav C Balan

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Comments

Rob Sedgwick · Accepted Answer · 2014-02-02 11:39:23Z

0

One way to get the value of a 'checked' check box which includes the check if 'checked'

var check1value = document.querySelector('#check1:checked').value;

In the html you are missing a value attribute (if checked)

<input name="checkn1" id="check1" value="value-here" type="checkbox" />

edited Feb 2, 2014 at 11:39

answered Feb 2, 2014 at 11:34

Rob Sedgwick

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2 Comments

user3129375 Over a year ago

how could I get "off" when not selected ?

user3129375 Over a year ago

Actually when second box is selected and first is not selected then no alert is shown.

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