Deselect checkbox if confirm is false

[KeredDrahcir]

I have a series of checkboxes that uses can click on which will cause a form to submit. Before I submit the form I wasn't them to confirm that's what they want to do.
I can't seem to uncheck the box if they choose cancel and I'm not sure what is wrong with the code I'm using. Can anyone help?

<input type="checkbox" name="box_1" id="box_1" value="1" onclick="javascript:if (confirm('Are you sure?')){this.form.submit();}else{document.getElementById('box_1').checked = 'false';};" />

Am I missing something obvious?

[gits]

since you are setting a javascript property of the dom-element you should set it as a boolean value and not as a string. basically it can be simplified as well like this:

<input type="checkbox" name="box_1" id="box_1" value="1" onclick="
    if (confirm('Are you sure?')) {
        this.form.submit();
    } else {
        this.checked = false;
    };
"/>
 

[KeredDrahcir]

That makes sense. Thanks. I'll give it a try and let you know. The reason I was setting it as a string was becuase it hadn't worked so I'd tried something else but I have a feeling it's going to work. Thanks.