Backbone.js extend view is a method under the view class that is used to extend the backbone.js view class in order to create a custom view class. For implementation, first of all, we need to create a custom view class and override the render function if required, also we can specify our own declarative events.
Syntax:
Backbone.view.extend( properties , [classProperties] )
Parameter values:
- properties: It defines the instance properties for the view class.
- classProperties: It defines the class properties of the constructor function attached to it.
Example 1: Basic example for implementing backbone.js extend the view.
HTML
<!DOCTYPE html><html><head> <title>Backbone.js view extend</title> type="text/javascript"></script> <script src= type="text/javascript"></script> <script src= type="text/javascript"></script></head><body> <h1 style="color:green;"> neveropen </h1> <button onclick="invoke()">Click me</button> <script> var example = Backbone.View.extend({ tagName: "test", className: "example_display", events: { }, initialize: function () { // Put pre-render processing code here this.render(); }, render: function () { // Put html render content here document.write( "<h2>This output is from render function</h2>"); } }); function invoke() { var obj = new example(); } </script></body></html> |
Output:
Example 2: In this example, we are using a simple boilerplate for the reference implementation.
HTML
<!DOCTYPE html><html><head> <title>Backbone.js view extend</title> <script src= </script> <script src= type="text/javascript"> </script> <script src= type="text/javascript"> </script></head><body> <h1 style="color:green;">neveropen</h1> <script> var example = Backbone.View.extend({ tagName: "test", className: "example_display", events: { }, initialize: function () { //put pre-render processing code here window.alert('Initialization function invoked'); this.render(); }, render: function () { //put html render content here window.alert('render function invoked'); } }); var obj = new example(); </script></body></html> |
Output:
Reference: https://backbonejs.org/#View-extend
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