javascript: Unchecking all checkboxes

Question

I have problem dealing with unchecking all checkboxes. When I click on a toggle all checkbox, it could check all checkboxes. But if I uncheck the toggle all checkbox, nothing happens. All checkboxes are not unchecked. Below is my coding in javascript: ``` ``` I had even tried this coding, but still failed: ``` ```…

Accepted Answer

The problem boils down to how you're setting the `checked` property of the checkox. You're assigning a string with "true" where you should be assigning the boolean value `true`.

So to fix your code is easy:

```
if( isAllCheck == false ){
    cbarray[i].checked = true;
}else{ 
    cbarray[i].checked = false;
}
```

or, more succinctly

```
cbarray[i].checked = !isAllCheck
```

Live example: http://jsfiddle.net/SEJZP/

javascript: Unchecking all checkboxes

Solution

Problem