Shortcuts for $scope variables in AngularJS templates

Question

Shortcuts for $scope variables in AngularJS templates

Within my controller, I often set:

$scope.currentThing.data

For different parts of my template, sometimes I require

currentThing.data.response[0].hello

and other times

currentThing.data.otherStuff[0].goodbye
//or
currentThing.data.anotherThing[0].goodMorning

I've been contemplating the possibility of creating shortcuts for these variables directly within the templates. For instance:

{{response = currentThing.data.response[0]}}

This would allow me to simplify and use it as {{response.hello}}.

Overall, I'm curious if it's feasible to assign temporary variables from the template without requiring data-binding. These variables only serve the purpose of generating the template before disappearing entirely.

javascript angularjs angularjs-scope angular-template

Answer 1

Answer №1

If you want to achieve this functionality in the controller, you can refer to the code snippet below:

app.controller('firstCtrl', function($scope){
 $scope.currentThing = {

   data: [

     {response:[
       {hello:1},
       {hello:2}
     ]}
   ]

 };
 $scope.temp = $scope.currentThing.data[0];

});

Here is an example of how you can display the 'response' object in HTML:

 <div ng-controller="firstCtrl">
  {{temp.response |json }}
      </div>

Answer 2

If you want to achieve this functionality in the controller, you can refer to the code snippet below:

app.controller('firstCtrl', function($scope){
 $scope.currentThing = {

   data: [

     {response:[
       {hello:1},
       {hello:2}
     ]}
   ]

 };
 $scope.temp = $scope.currentThing.data[0];

});

Here is an example of how you can display the 'response' object in HTML:

 <div ng-controller="firstCtrl">
  {{temp.response |json }}
      </div>

Answer 3

Answer №2

If you're looking for a solution, consider using ngInit. Check out the documentation here: https://docs.angularjs.org/api/ng/directive/ngInit

It's worth noting that some developers frown upon using ngInit outside of ngRepeat.

<div ng-init="myvar = currentThing.data.response[0]">
    <span>{{myvar.hello}}</span>
</div>

I haven't personally tested this approach, but it might be worth trying as a potential solution to your issue.

Answer 4

If you're looking for a solution, consider using ngInit. Check out the documentation here: https://docs.angularjs.org/api/ng/directive/ngInit

It's worth noting that some developers frown upon using ngInit outside of ngRepeat.

<div ng-init="myvar = currentThing.data.response[0]">
    <span>{{myvar.hello}}</span>
</div>

I haven't personally tested this approach, but it might be worth trying as a potential solution to your issue.

Answer 5

Answer №3

A great way to achieve this is by utilizing the following syntax:

{{ variable = ( expression ) }}

This can be done anywhere in an HTML template, not limited to just using ng-init as commonly suggested.

Utilizing this approach can be incredibly beneficial when you need to use a calculated variable multiple times, as it eliminates the need to recalculate it each time.

Here is an example:

<!-- Calculate value before -->
<p> Calculated value is {{calculated}} </p>

<div ng-repeat="item in calculated = ( allItems | filter1 | filter2 | filter3 ) ">
   {{item}} 
</div>

<!-- Calculate value after-->
<p> Calculated value is still {{calculated}} </p>

Edit: Therefore, in your specific case, you can do:

{{response = ( currentThing.data.response[0] ) }}

Answer 6

A great way to achieve this is by utilizing the following syntax:

{{ variable = ( expression ) }}

This can be done anywhere in an HTML template, not limited to just using ng-init as commonly suggested.

Utilizing this approach can be incredibly beneficial when you need to use a calculated variable multiple times, as it eliminates the need to recalculate it each time.

Here is an example:

<!-- Calculate value before -->
<p> Calculated value is {{calculated}} </p>

<div ng-repeat="item in calculated = ( allItems | filter1 | filter2 | filter3 ) ">
   {{item}} 
</div>

<!-- Calculate value after-->
<p> Calculated value is still {{calculated}} </p>

Edit: Therefore, in your specific case, you can do:

{{response = ( currentThing.data.response[0] ) }}

Shortcuts for $scope variables in AngularJS templates

Answer №1

Answer №2

Answer №3

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