如何使用 javascript 禁用和重新启用按钮？
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How do I disable and re-enable a button in with javascript?
提问by Adam
I can easily disable a javascript button, and it works properly. My issue is that when I try to re-enable that button, it does not re-enable. Here's what I'm doing:
我可以轻松禁用 javascript 按钮，并且它可以正常工作。我的问题是，当我尝试重新启用该按钮时，它不会重新启用。这是我在做什么：
<script type="text/javascript">
function startCombine(startButton) {
startButton.disabled = 'true';
startButton.disabled = 'false';
}
</script>
<input type='button' id='start' value='Combine Selected Videos'
onclick='startCombine(this);'>
Why isn't this working, and what can I do to make it work?
为什么这不起作用，我该怎么做才能使它起作用？
回答by alex
trueand falseare not meant to be strings in this context.
true并且false在这种情况下并不意味着是字符串。
You want the literal trueand falseBooleanvalues.
你想要文字true和falseBoolean值。
startButton.disabled = true;
startButton.disabled = false;
The reason it sort ofworks (disables the element) is because a non empty string is truthy. So assigning 'false'to the disabledproperty has the same effect of setting it to true.
它有点工作（禁用元素）的原因是因为非空字符串是truthy。因此，分配'false'给disabled属性与将其设置为true.
回答by debasish
<script>
function checkusers()
{
var shouldEnable = document.getElementById('checkbox').value == 0;
document.getElementById('add_button').disabled = shouldEnable;
}
</script>
回答by Narendra
you can try with
你可以试试
document.getElementById('btn').disabled = !this.checked"
document.getElementById('btn').disabled = !this.checked"
<input type="submit" name="btn" id="btn" value="submit" disabled/>
<input type="checkbox" onchange="document.getElementById('btn').disabled = !this.checked"/>