Convert millimeters to inches with a unique AngularJS filter that activates on click

I am currently working on a UI that requires users to enter dimensions for width and height.

Within the UI, there are 2 buttons available - one for 'mm' and the other for 'inches'. When either of these buttons is pressed, the active class should switch from the default (mm) to inches, which is functioning correctly.

Additionally, when either button is clicked, it should update the field icons displayed from 'mm' to 'inches', also working as intended.

My challenge lies in implementing a filter that functions on-click. I already have a function in my controller that executes on-click and updates the active class of the button and field icons by setting $scope.activeUnit = currentUnit. The code snippet for the filter is provided below:

.filter('convertUnits', function() {
    return (function(unit) {
        if (unit == 'inches') {
            return Math.floor(input * 0.0393701);
            console.log('hello-inches');
        }
        else if (unit == 'mm') {
            return Math.floor(input / 0.0393701);
            console.log('hello-mm');
        }
    });
})

The function responsible for handling the on-click event is outlined below:

$scope.changeUnits = function(unit) {
        $scope.activeUnit = unit
        console.log(unit);

        // Implement filter logic here?
        // Update all instances of mm to inches on the view and vice versa
    }

I aim to incorporate this functionality within the on-click function in my controller, converting all dimensions on the view to inches when prompted and reverting back when switching to mm.

Your assistance in enabling this feature would be greatly appreciated.

Answer №1

Is it possible to pass activeUnit as a parameter to the filter in the template? Have you tested this approach? Modifying activeUnit should automatically update the value through binding.

<span ng-bind="length | convertUnits : activeUnit"></span>

<span>{{length | convertUnits : activeUnit}}/span>

Your custom filter is missing a parameter. Additionally, using console.log after return will not work.


.filter('convertUnits', function() {
    return (function (input, unit) {
                      ----^

However, maintaining the same value in the model while only changing units can be confusing.

value = 10
unit = mm

value = 10
unit = inches

If the value is meant to always be in either mm or inches, it could lead to incorrect and confusing data.

Perhaps providing more details about your original requirement would help clarify things.

  1. Are you displaying a static value that users can view by switching units?
  2. Do you have an input field where users can enter values in any unit?

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