When reviewing certain Angular JS files, I often come across the following syntax. What is the significance of a double colon "::" in this context?
<span>{{::x}}</span>
<div>{{::y.z()}}</div>
When reviewing certain Angular JS files, I often come across the following syntax. What is the significance of a double colon "::" in this context?
<span>{{::x}}</span>
<div>{{::y.z()}}</div>
A unique function known as one-time data binding was introduced in Angular 1.3. For users with older versions, a similar solution called bindone can be used.
According to the documentation of Angular JS:
An expression that begins with :: is recognized as a one-time expression. These expressions cease recalculating once they become stable, usually after the initial digest if the result is a non-undefined value.
Essentially, if you input :
{{::x}}
Angular will eliminate the watcher once x becomes defined. However, the downside is that if the value of x changes after this elimination, it will not be updated in the view.
A recently added feature modified using AngularJS version 1.3 and above.
The concept of one-time binding is implemented in this code snippet. It allows data to be displayed once and remain unchanged even if the Model is updated later on. For more information, you can check out the following link:
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