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Google AMP amp-bind
  • Last Updated : 29 Oct, 2020

 

Sometimes you want to add custom interactivity to your AMP pages to make your pages look more user-friendly and user calling. Although AMP’s pre-built components are limited, so amp-bind is made to overcome this problem. It helps the developer to add custom interactivity to the pages without using AMP’s pre-built components.

Setup: To use amp-bind in your page you have to import its script in the header of the document.

HTML




<script async custom-element="amp-bind"
</script>


The amp-bind of Google AMP comprises three main concepts:



  1. State: State variables are responsible for the update on the page on the basis of user actions. It is very important to define a state variable.
  2. Expression: They are like JavaScript expressions used to refer to the state.
  3. Binding: They are a special attribute that is used to link an element’s property to a state via an expression.

Example: Dynamically adding text when the button is clicked.

HTML




<!doctype html>
<html amp>
 
<head>
    <meta charset="utf-8">
    <title>Google AMP amp-bind</title>
    <link rel="canonical" href=
 
    <meta name="viewport" content=
"width=device-width,minimum-scale=1,initial-scale=1">
 
    <script async src=
    </script>
 
    <script async custom-element="amp-bind"
    </script>
 
    <style amp-boilerplate>
        body {
            -webkit-animation: -amp-start 8s
                steps(1, end) 0s 1 normal both;
 
            -moz-animation: -amp-start 8s
                steps(1, end) 0s 1 normal both;
 
            -ms-animation: -amp-start 8s
                steps(1, end) 0s 1 normal both;
 
            animation: -amp-start 8s
                steps(1, end) 0s 1 normal both;
        }
 
        @-webkit-keyframes -amp-start {
            from {
                visibility: hidden
            }
 
            to {
                visibility: visible
            }
        }
 
        @-moz-keyframes -amp-start {
            from {
                visibility: hidden
            }
 
            to {
                visibility: visible
            }
        }
 
        @-ms-keyframes -amp-start {
            from {
                visibility: hidden
            }
 
            to {
                visibility: visible
            }
        }
 
        @-o-keyframes -amp-start {
            from {
                visibility: hidden
            }
 
            to {
                visibility: visible
            }
        }
 
        @keyframes -amp-start {
            from {
                visibility: hidden
            }
 
            to {
                visibility: visible
            }
        }
    </style>
 
    <noscript>
        <style amp-boilerplate>
            body {
                -webkit-animation: none;
                -moz-animation: none;
                -ms-animation: none;
                animation: none
            }
        </style>
    </noscript>
     
    <style amp-custom>
        h1 {
            color: forestgreen;
            text-align: center;
        }
    </style>
</head>
 
<body>
    <h1>
        Geeks For Geeks
    </h1>
 
    <div style="padding: 1em;">
        <div hidden [hidden]="hideGreeting"
            style="color: crimson;">
            Welcome to GeeksForGeeks
        </div>
 
        <button on=
"tap:AMP.setState({ hideGreeting: false })">
            Click Me!!
        </button>
    </div>
</body>
 
</html>


Output:

Explanation: When the button is click, the hidden attribute called hideGreeting got updated, as its state updated via AMP.setState() action.

Uses: The amp-bind can be used for various purposes, some of them are:

  • It can be used to dynamically change the content.
  • It can be used to dynamically update the image.
  • It can be used to dynamically change the classes of the element.
  • It can be used to change the CSS attributes the value of the element.



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