How to sanitize user input to URL with an amp-bind-macro call ?

Last Updated : 21 Dec, 2020

Introduction: Sometimes you may want to sanities your input to the search URL of the Google, this can be achieved with the help of amp-bind-macro. It can be used to create a sanitized URL dynamically. A sanitized URL can be achieved by simply converting the input to lowercase and replacing the spaces with ‘%20’.

Setup: To use amp-bind-macro in our AMP page we have to import amp-bind script in the head of the document.

<script async custom-element="amp-bind" src= 
"https://cdn.ampproject.org/v0/amp-bind-0.1.js"> 
</script>

Example:

<!DOCTYPE html> 
<html amp> 
  
<head> 
    <title>GeeksForGeeks | amp-bind-macro</title> 
    <meta charset="utf-8" /> 
      
    <script async  
        src="https://cdn.ampproject.org/v0.js"> 
    </script> 
  
    <link rel="canonical" href= 
"https://amp.dev/documentation/examples/components/amp-bind-macro/index.html"/> 
  
    <meta name="viewport" content="width=device-width, 
        minimum-scale=1, initial-scale=1" /> 
  
    <!-- Import the `amp-bind` component 
        to use `amp-bind-macro`. -->
    <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; 
        } 
    </style> 
</head> 
  
<body> 
    <center> 
        <h1>GeeksForGeeks</h1> 
    </center> 
  
    <!-- The `replaceSpace` expression defined 
        in `amp-bind-macro` replaces spaces in 
        user input with `s/ /%20/` and sets all 
        letters to lowercase to match url format 
        for Google search -->
    <div style="left: 0.5em; position: absolute;"> 
        <amp-bind-macro id="replaceSpace" 
            arguments="str" expression= 
            "str.toLowerCase().split(' ').join('%20')"> 
        </amp-bind-macro> 
  
        <p> 
            Type in something you want  
            to search with spaces 
        </p> 
  
        <input type="text" placeholder="Search Query"
            on="input-throttled:AMP.setState( 
                { argumentString: event.value })" /> 
  
        <p="'You have create a sanitized link:' 
            ' https://www.google.com/search?q=' 
            'replaceSpace(argumentString)"> 
            Your sanitized link will display  
            here. You can copy and paste into 
            search bar to test. 
        </p> 
    </div> 
</body> 
  
</html> 