如何使用javascript禁用和重新启用按钮？

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，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。这就是我正在做的事情：

<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工作？

3 个解决方案

#1

true and false are not meant to be strings in this context.

在这种情况下，true和false并不意味着是字符串。

You want the literal true and false Boolean values.

您需要文字的true和false布尔值。

startButton.disabled = true;

startButton.disabled = false;

The reason it sort of works (disables the element) is because a non empty string is truthy. So assigning 'false' to the disabled property has the same effect of setting it to true.

它有效的原因（禁用元素）是因为非空字符串是真的。因此，将“false”分配给disabled属性与将其设置为true具有相同的效果。

#2

<script>
function checkusers()
{
   var shouldEnable = document.getElementById('checkbox').value == 0;
   document.getElementById('add_button').disabled = shouldEnable;
}
</script>

#3

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"/>

#1