bootstrap button disabled flags code example
Example 1: bootstrap disabled button
<button type="button" class="btn btn-lg btn-primary" disabled>Primary button</button>
<button type="button" class="btn btn-secondary btn-lg" disabled>Button</button>
Example 2: bootstrap buttons Disabled state
Make buttons look inactive by adding the disabled boolean attribute to any
<button> element.
<button type="button" class="btn btn-lg btn-primary" disabled>Primary button</button>
<button type="button" class="btn btn-secondary btn-lg" disabled>Button</button>