A guide to activating an input field based on the value of another input field in AngularJs

An AngularJs form requires the user to input the number of hours worked. If the value entered is 0, an additional question should be displayed for the reason why no work was done.

<label>Hours worked:</label>
<input ng-model="hours" type="number" placeholder="8" />

<label ng-class="{'disabled-label': ifHoursZero}">Reason for not working:</label>
<input ng-disabled="ifHoursZero" ng-model="reason" type="text" />

How can CSS and input fields be toggled elegantly in Angular based on the value of hours, specifically when it is equal to 0? Is there a pattern or method that directly links this behavior to the hours variable?

javascriptangularjs

Answer №1

Create a function named checkIfHoursZero that will return a boolean value. Use it in your code as ng-disabled="checkIfHoursZero()"

Here is an example implementation:

function checkIfHoursZero() {
    return $scope.hours === 0;
}

Check out this jsBin link for more details.

Answer №2

Completing this task should not require adding a function to the controller:

<label>How many hours did you spend working?</label>
<input ng-model="hours" type="number" placeholder="8" />

<div ng-show="hours === 0">
  <label>What was the reason for not working at all?</label>
  <input ng-model="reason" type="text" />
</div>

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