How can I determine if a value exists in an array within an Angular template?

Is there a method to determine if a value is present in an array within an angular template? I would like something similar to this:

<div ng-class="{'myClass': 1 in [1,2,5]}">Yay</div>

If 1 is found in the array, myClass will be applied.

Is this functionality supported?

Additionally, could you provide information on the templating engine used with AngularJS? Where can I access documentation for it? My searches, including official resources, only return results related to directives or data binding.

javascriptangularjstemplate-engine

Answer №1

If you want to check if a value exists in an array, you can utilize the indexOf() method and incorporate it within your ngClass directive like this (to dynamically add "newclass"):

<div ng-class="{'newclass':([1,2,5].indexOf(2) > -1)}">Yay</div>

Alternatively, you may need to test against an array on your scope:

<div ng-class="{'newclass':(tarray.indexOf(1) > -1)}">Yay</div>

Assuming that you have defined tarray in your controller:

$scope.tarray=[1,2,5];

See demo here

Regarding a template engine, Angular already includes one. Therefore, there isn't a separate tool you need to look for. You can refer to the official template documentation and explore some great video tutorials that cover templates and other related topics.

Answer №2

You have the option to create a filter for validation purposes. For example:

app.filter('checkValue', function() {
    return function(array, value) {
        return array.indexOf(value) !== -1;
    };
});

Afterwards, you can incorporate this filter into your template like so:

<div ng-class="{'newclass': tarray | checkValue : 1}">Great!</div>

An added benefit is that it enhances the readability of your template.

Answer №3

Give this a shot:

ng-class="{'myClass':  !!~[1,2,5].indexOf(1)}"

If the value is not in the array, it will return 0, which means with double exclamation marks (!!) you get false.

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