Please see here: http://jsfiddle.net/nShQs/
Press the disable button and then the enable button. The checkbox doesn't get enabled.
HTML:
<input id="check" type="checkbox"/>
<input id="btn1" type="button" value="enable" />
<input id="btn2" type="button" value="disable" />
JS:
function enable() {
var x = document.getElementById("check");
alert(x.getAttribute("disabled"));
x.setAttribute("disabled", "false");
alert(x.getAttribute("disabled"));
}
function disable() {
var x = document.getElementById("check");
alert(x.getAttribute("disabled"));
x.setAttribute("disabled", "true");
alert(x.getAttribute("disabled"));
}
document.getElementById("btn1").addEventListener("click", enable);
document.getElementById("btn2").addEventListener("click", disable);
answer
As the answers tell it is because the disabled
attribute is a boolean attribute. See here.
Just do
function enable() {
document.getElementById("check").disabled= false;
}
function disable() {
document.getElementById("check").disabled= true;
}
With this you are setting the property of the DOM element, while setting attribute presence of attribute disabled
will disable the check box, so even if you do x.setAttribute("disabled", "false");
it will still be there on the element as attribute.
or you would just do:
function disable() {
document.getElementById("check").setAttribute('disabled', 'disabled');
}
function enable() {
document.getElementById("check").removeAttribute('disabled');
}
disabled
as attribute and disabled
as property are different.
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