How to access a disabled button

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An html button in the form is disabled on the fly using

document.getElementById('Btn').disabled = true;

Later, I wish to know the status of the button, if disabled or enabled. Using the following doesn't work:

if (document.getElementById('Btn').disabled == "true") {

What is the solution?

You can just use:

if (document.getElementById('Btn').disabled) {

Browser will render disabled="disabled" or just disabled. It's dependent on browser implementation. Thus, just checking true string with disabled attribute will not work.

The preceding code will just check if it has disabled attribute or say disabled attribute is available there.

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The disabled property accessor can be quite confusing. There is both an attribute and a property accessor which shadows the attribute.

You can use document.getElementById('Btn').hasAttribute('disabled') to check whether the element is disabled, or simply document.getElementById('Btn').disabled, since the property getter returns a boolean as well:

function logAttribute (btn, attr) {
  console.log(`hasAttribute ${btn.hasAttribute(attr)}`)
  console.log(`getAttribute ${btn.getAttribute(attr)}`)
  console.log(`hasOwnProperty ${btn.hasOwnProperty(attr)}`)
  console.log(`[attr] ${btn[attr]}`)
}

const btn = document.createElement('button')

console.log('----- uninitialized')
logAttribute(btn, 'disabled')
btn.disabled = true
console.log('----- set')
logAttribute(btn, 'disabled')
btn.disabled = false
console.log('----- unset')
logAttribute(btn, 'disabled')
.as-console-wrapper{max-height:100%!important;}

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The property disabled holds a boolean and not a string, so it has to be:

if (document.getElementById('Btn').disabled == true) {

Or just

if (document.getElementById('Btn').disabled) {

w3c html5: 4.10.7 The input element:

interface HTMLInputElement : HTMLElement {
   // ... 
   attribute boolean disabled;
}

So no matter what value was et to the attribute or to the property,you will always get a boolean if you access the the property disabled.

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Comments
  • document.getElementById('Btn').hasAttribute('disabled') should be sufficient.
  • if (document.getElementById('Btn').disabled) { as disabled is already a boolean (holding either true or false).
  • Don't put quotes around true.
  • Browser that behave according to the standard will return a boolean for document.getElementById('Btn').disabled. That's why the test document.getElementById('Btn').disabled == "true" fails because it would be true=="true".
  • @t.niese yes, that's what it implies. You should be reading my statement carefully: just checking true string...
  • What I meant, is that it is not relevant if the browser uses one of the standard conform ways disabled="disabled", disabled="" or disabled to represent the disbaled state for the attribute. The importatnt part is that the type of the property disabled will always be a boolean, no matter how the browser does represent it as attribute.
  • ...and last sentence verifies that.
  • @pushkin true=="true" is false not true
  • @PatrickRoberts the document.getElementById('Btn').disabled does access the proeprty, document.getElementById('Btn').getAttribute('disabled') returns the attribute, the attribute is a string, the property in this case is a boolean.