I have 5 checkboxes with name and id attribute:

<input type="checkbox" name="category" value="One" id=11>One<br/> 
<input type="checkbox" name="category" value="Two" id=12>Two<br/> 
<input type="checkbox" name="category" value="Three" id=13>Three<br/> 
<input type="checkbox" name="category" value="Four" id=14>Four<br/>

I want Javascript code to enable checkbox1 using that checkbox id.

I have 5 checkboxes with name and id attribute:

<input type="checkbox" name="category" value="One" id=11>One<br/> 
<input type="checkbox" name="category" value="Two" id=12>Two<br/> 
<input type="checkbox" name="category" value="Three" id=13>Three<br/> 
<input type="checkbox" name="category" value="Four" id=14>Four<br/>

I want Javascript code to enable checkbox1 using that checkbox id.

• javascript
• checkbox

• enable how? are they initially disabled? – amosrivera Commented Jan 19, 2011 at 8:25
• <input type="checkbox" name="category" value="One" id=11>One<br/> <input type="checkbox" name="category" value="Two" id=12>Two<br/> <input type="checkbox" name="category" value="Three" id=13>Three<br/> <input type="checkbox" name="category" value="Four" id=14>Four<br/> <script type="text/javascript">/*JS Code to enable the Checkbox 1*/ </script> – Ankit Commented Jan 19, 2011 at 8:28
• If you are generating the code on the server side (or even if it is static code), you know you can make a checkbox be ticked by default by adding checked="checked" as attribute? – Felix Kling Commented Jan 19, 2011 at 8:29
• I agree but I want to enable the checkbox after their declaration through javascript. – Ankit Commented Jan 19, 2011 at 8:32
• @ankitjava: So you are creating them with JS. You did not say that ;) (at least not that it was clear to me :D) – Felix Kling Commented Jan 19, 2011 at 8:34

4 Answers 4

Try this for checking the checkbox:

document.getElementById(<id of first checkbox>).checked = true;

Try this for enabling the checkbox:

document.getElementById(<id of first checkbox>).disabled = false;

try

   document.myform.box1.checked = true;

or

document.getElementById('myid').checked = true;

see an full example : http://www.rgagnon./jsdetails/js-0007.html

document.getElementById('checkbox1').checked = true;

To check a check box you can use :

document.getElementById("Checkbox_ID").checked = true;

And to uncheck a check box you can use :

document.getElementById("Checkbox_ID").checked = false;

And for more info visit this page