value of a checkBox within a Javascript function

Question

I need to get the value of a checkbox put on my form within a javascript function. This is the code i'm using right now:

var Excludeviv = document.getElementById("ctl00_ctl00_cphMain_cphMainMenu_chkExcludeviv").value;

i put an alert to check the value that Exludeviv contains. i always get "on", i don't understand. Can anyone help me on this ? Thanks in advance

You store the checkbox’s value in that variable at some point, but the variable won’t get updated automatically when the checkbox is clicked. You need to take care of that, e.g. by having the checkbox’s click event trigger a function that updates your Excludeviv variable. — fanaugen
– fanaugen, Commented Feb 17, 2012 at 11:53

Jeremy A. West · Accepted Answer · 2012-02-17 11:52:53Z

2

Use .checked

var Excludeviv = document.getElementById("ctl00_ctl00_cphMain_cphMainMenu_chkExcludeviv").checked;

answered Feb 17, 2012 at 11:52

Jeremy A. West

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F.P · Accepted Answer · 2012-02-17 11:51:34Z

2

You need to check for the checked attribute, not the value.

var Excludeviv = document.getElementById("...").checked;

value is the value of the attribute value, which never changes:

<input type="checkbox" value="on" />

If the user checks the checkbox, the checked attribute changes - the value stays the same!

answered Feb 17, 2012 at 11:51

F.P

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Ravi Gadag · Accepted Answer · 2012-02-17 11:55:07Z

0

var Excludeviv = document.getElementById('<%=yourCheckBox.ClientID %>')

try like this.

  if(Excludeviv && Excludeviv.checked) 
   {
     //do something 
   }

answered Feb 17, 2012 at 11:55

Ravi Gadag

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alexsuslin · Accepted Answer · 2012-02-17 11:55:29Z

0

If you want to check the status use 'checked' property of the checkbox.

In fact, when checkbox is unchecked form will not send usually the state of that checkbox, and if e.g. you have lots of checkboxes, their states will be in array with the name 'on'... so you can figure it out manually and set your own value on checkbox.

answered Feb 17, 2012 at 11:55

alexsuslin

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