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:
- 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 =
< 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 >
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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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