回答編集履歴
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`disabled`
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`disabled`プロパティの値はbool値です。
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[https://developer.mozilla.org/ja/docs/Web/API/HTMLInputElement
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](https://developer.mozilla.org/ja/docs/Web/API/HTMLInputElement)
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[https://codepen.io/anon/pen/JvQyQX](https://codepen.io/anon/pen/JvQyQX)
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# 参考
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> 4.10.19.5 Enabling and disabling form controls: the disabled attribute
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The disabled content attribute is a boolean attribute.
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> A form control is disabled if its disabled attribute is set, or if it is a descendant of a fieldset element whose disabled attribute is set and is not a descendant of that fieldset element's first legend element child, if any.
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> A form control that is disabled must prevent any click events that are queued on the user interaction task source from being dispatched on the element.
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Constraint validation: If an element is disabled, it is barred from constraint validation.
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> The disabled IDL attribute must reflect the disabled content attribute.
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[https://www.w3.org/TR/2018/SPSD-html5-20180327/forms.html#concept-fe-disabled](https://www.w3.org/TR/2018/SPSD-html5-20180327/forms.html#concept-fe-disabled)
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> 2.4.2 Boolean attributes
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A number of attributes are boolean attributes. The presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value.
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> If the attribute is present, its value must either be the empty string or a value that is an ASCII case-insensitive match for the attribute's canonical name, with no leading or trailing whitespace.
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> The values "true" and "false" are not allowed on boolean attributes. To represent a false value, the attribute has to be omitted altogether.
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> Here is an example of a checkbox that is checked and disabled. The checked and disabled attributes are the boolean attributes.
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```
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<label><input type=checkbox checked name=cheese disabled> Cheese</label>
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This could be equivalently written as this:
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<label><input type=checkbox checked=checked name=cheese disabled=disabled> Cheese</label>
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You can also mix styles; the following is still equivalent:
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<label><input type='checkbox' checked name=cheese disabled=""> Cheese</label>
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```
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[https://www.w3.org/TR/2018/SPSD-html5-20180327/infrastructure.html#boolean-attribute](https://www.w3.org/TR/2018/SPSD-html5-20180327/infrastructure.html#boolean-attribute)
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4
https://codepen.io/anon/pen/JvQyQX
test
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[https://codepen.io/anon/pen/X
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[https://codepen.io/anon/pen/JvQyQX](https://codepen.io/anon/pen/JvQyQX)
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3
https://codepen.io/anon/pen/XqLaQr?editors=1111
test
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もしくは、`if(hintBtn.disabled)`か、`if(!hintBtn.disabled)`です。
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[https://codepen.io/anon/pen/XqLaQr](https://codepen.io/anon/pen/XqLaQr)
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2
a
test
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@@ -17,3 +17,7 @@
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正しくは、`if(hintBtn.disabled === true)`か、`if(hintBtn.disabled === false)`です。
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もしくは、`if(hintBtn.disabled)`か、`if(!hintBtn.disabled)`です。
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1
a
test
CHANGED
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@@ -8,4 +8,12 @@
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-
`disabled`属性の値はbool
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`disabled`属性の値はbool値です。
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なので、`if(hintBtn.disabled === 'disabled')`の条件式だと常に`false`が返ります。
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正しくは、`if(hintBtn.disabled === true)`か、`if(hintBtn.disabled === false)`です。
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