Which directives in AngularJS facilitate one-way binding?

Question

Which directives in AngularJS facilitate one-way binding?

Which directives in AngularJS support one-way binding? While ng-model enables two-way binding, what about ng-bind and {{ }} expressions - do they also support one-way binding?

javascript angularjs data-binding angularjs-directive angularjs-scope

Answer 1

Answer №1

By default, AngularJS uses 2-way data-binding when utilizing ng-model. The ng-bind directive is essentially the same as using {{ }}, and serves as a one-way data binding method specifically for displaying values within HTML components as inner HTML. It's important to note that ng-bind should be used in conjunction with ng-model.

To achieve one-way data-binding, you can also create a custom directive with an isolated scope. Within this isolated scope, there are three different binding options prefaced with symbols indicating their use:

@ for Text Binding
& for One-way Binding
= for Two-way Binding

In your JavaScript file:

angular.module("myApp",[])  
  .directive("myDirective", function () {
    return {
      restrict: "AE",
      scope: {
        text: "@attrText",
        twoWayBind: "=attrTwoWayBind",
        oneWayBind: "&attrOneWayBind"
      }
    };
  }).controller("myController", function ($scope) {
    $scope.info = {name: "dhia", age: 25};
    $scope.text = "Text to be displayed";
});

HTML

<div ng-controller="myController">  
  <div my-directive
    attr-text="{{ text }}"
    attr-two-way-bind="info"
    attr-one-way-bind="text">
  </div>
</div>

NB:

Text bindings are always treated as strings.
One-way bindings can be of any type.
Two-way bindings can also be of any type.

If you're new to AngularJS directives, I recommend checking out this helpful guide on AngularJS directives to get a better understanding of how to implement custom directives, the different types of directives available, and conventional naming practices for attributes.

Answer 2

By default, AngularJS uses 2-way data-binding when utilizing ng-model. The ng-bind directive is essentially the same as using {{ }}, and serves as a one-way data binding method specifically for displaying values within HTML components as inner HTML. It's important to note that ng-bind should be used in conjunction with ng-model.

To achieve one-way data-binding, you can also create a custom directive with an isolated scope. Within this isolated scope, there are three different binding options prefaced with symbols indicating their use:

@ for Text Binding
& for One-way Binding
= for Two-way Binding

In your JavaScript file:

angular.module("myApp",[])  
  .directive("myDirective", function () {
    return {
      restrict: "AE",
      scope: {
        text: "@attrText",
        twoWayBind: "=attrTwoWayBind",
        oneWayBind: "&attrOneWayBind"
      }
    };
  }).controller("myController", function ($scope) {
    $scope.info = {name: "dhia", age: 25};
    $scope.text = "Text to be displayed";
});

HTML

<div ng-controller="myController">  
  <div my-directive
    attr-text="{{ text }}"
    attr-two-way-bind="info"
    attr-one-way-bind="text">
  </div>
</div>

NB:

Text bindings are always treated as strings.
One-way bindings can be of any type.
Two-way bindings can also be of any type.

If you're new to AngularJS directives, I recommend checking out this helpful guide on AngularJS directives to get a better understanding of how to implement custom directives, the different types of directives available, and conventional naming practices for attributes.

Answer 3

Answer №2

How you choose to utilize your scope is up to you, refer to the Angular website for guidance on one-way data binding

<body ng-app ng-init="firstName = 'John'; lastName = 'Doe';"> First name: {{firstName}} Last name: </body>

In addition, here is information on creating custom directives:

Answer 4

How you choose to utilize your scope is up to you, refer to the Angular website for guidance on one-way data binding

<body ng-app ng-init="firstName = 'John'; lastName = 'Doe';"> First name: {{firstName}} Last name: </body>

In addition, here is information on creating custom directives:

Answer 5

Answer №3

There are two ways to specify a data binding:

Using curly braces: {{value}}

Utilizing the ng-bind directive: ng-bind="variableName"

I trust this clarifies your query.

Answer 6

There are two ways to specify a data binding:

Using curly braces: {{value}}

Utilizing the ng-bind directive: ng-bind="variableName"

I trust this clarifies your query.

Which directives in AngularJS facilitate one-way binding?

Answer №1

Answer №2

Answer №3

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