Google AMP amp-bind
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" src = "https://cdn.ampproject.org/v0/amp-bind-0.1.js" > </ script > |
The amp-bind of Google AMP comprises three main concepts:
- 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.
- Expression: They are like JavaScript expressions used to refer to the state.
- 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 = "https://amp.dev/documentation/examples/components/amp-bind/index.html" > < meta name = "viewport" content = "width=device-width,minimum-scale=1,initial-scale=1" > < script async src = "https://cdn.ampproject.org/v0.js" > </ script > < script async custom-element = "amp-bind" src = "https://cdn.ampproject.org/v0/amp-bind-0.1.js" > </ 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 > Beginner For Beginner </ h1 > < div style = "padding: 1em;" > < div hidden [hidden]="hideGreeting" style = "color: crimson;" > Welcome to w3wiki </ 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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