Unique: "Best Practices for Setting Angular.js Controller Data Directly in the Code"

Question

Unique: "Best Practices for Setting Angular.js Controller Data Directly in the Code"

In this scenario, I need to initialize the data from an inline script, even though I know how to achieve this using a promise on an http request.

Currently, the controller is already defined in the header js:

var testModule = angular.module('myTestModule', []);
testModule.controller('testCtrl', function ($scope) {
    $scope.data = [];
});

Below is the HTML that loads. Let's assume that the script part takes a significant amount of time to complete:

<div ng-app="myTestModule" ng-controller="testCtrl">
...
</div>
<script type="text/javascript">
    setInitialData(['boo', 'far']);
</script>

If the inline script were loaded BEFORE the div with ng-app, everything would work fine. However, in this case, it might load after the controller has been instantiated. I want to avoid making an extra http request, but at the same time, I see the convenience of using a promise with an angular service.

Does anyone have suggestions on how to design the function setInitialData so that it can apply the data to the controller/scope?

javascript angularjs

Answer 1

Answer №1

If you want to access the scope of any DOM element in AngularJS, you can utilize the angular.element(...).scope() method. A helpful tip is to use angular.element($0).scope() in the devtools JS console to grab the scope of the currently selected element in the Elements tab.

Once you have the scope reference, you can make necessary changes to it. Remember to invoke $apply() to notify AngularJS about the modification.

For instance:

<div ng-app="myTestModule" ng-controller="testCtrl" id="testCtrl">
...
</div>
<script type="text/javascript">
    function setScopeValue(selector, scopeProp, value) {
        angular.element(selector).scope().$apply(function ($scope) {
            $scope[scopeProp] = value;
        });
    }

    function setInitialData(data) {
        setScopeValue('#testCtrl', 'data', data);
    }

    setInitialData(['boo', 'far']);
</script>

Please note that the setScopeValue() function provided only supports a single level of property access and does not allow for nested properties. If you require setting nested properties, consider using $parse() to generate a setter function that can be called with the $scope and the value to be assigned.

Answer 2

If you want to access the scope of any DOM element in AngularJS, you can utilize the angular.element(...).scope() method. A helpful tip is to use angular.element($0).scope() in the devtools JS console to grab the scope of the currently selected element in the Elements tab.

Once you have the scope reference, you can make necessary changes to it. Remember to invoke $apply() to notify AngularJS about the modification.

For instance:

<div ng-app="myTestModule" ng-controller="testCtrl" id="testCtrl">
...
</div>
<script type="text/javascript">
    function setScopeValue(selector, scopeProp, value) {
        angular.element(selector).scope().$apply(function ($scope) {
            $scope[scopeProp] = value;
        });
    }

    function setInitialData(data) {
        setScopeValue('#testCtrl', 'data', data);
    }

    setInitialData(['boo', 'far']);
</script>

Please note that the setScopeValue() function provided only supports a single level of property access and does not allow for nested properties. If you require setting nested properties, consider using $parse() to generate a setter function that can be called with the $scope and the value to be assigned.

Unique: "Best Practices for Setting Angular.js Controller Data Directly in the Code"

Answer №1

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