Javascript HashChangeEvent Tutorial with Examples

HashChangeEvent

1. HashChangeEvent

Hash is "Anchor part" of an URL. It tells the browser to scroll the browser scrollbar to display the content area corresponding to Hash.

Ví dụ với Hash:

hash-example.html

<!DOCTYPE html>
<html>
   <head>
      <title>Hash Example</title>
      <meta charset="UTF-8">
      <style>
         .content {
            margin-top: 30px;
            padding: 5px;
            border: 1px solid #ddd;
         }
      </style>
   </head>
   <body>
       <a href="#chapter1">Go to Chapter 1</a>
        ||
       <a href="#chapter2">Go to Chapter 2</a>
        ||
       <a href="#chapter3">Go to Chapter 3</a>

      <div class="content">
         <!-- Anchor 1 -->
         <a id="chapter1"></a>
         <h3>Chapter 1</h3>
             Chapter 1 content <br/>
             Chapter 1 content <br/>
             Chapter 1 content <br/>
             Chapter 1 content <br/>
             Chapter 1 content <br/>
             Chapter 1 content <br/>
             Chapter 1 content <br/>
             Chapter 1 content <br/>
             Chapter 1 content <br/>

         <!-- Anchor 2 -->
         <a id="chapter2"></a>
         <h3>Chapter 2</h3>
             Chapter 2 content <br/>
             Chapter 2 content <br/>
             Chapter 2 content <br/>
             Chapter 2 content <br/>
             Chapter 2 content <br/>
             Chapter 2 content <br/>
             Chapter 2 content <br/>
             Chapter 2 content <br/>
             Chapter 2 content <br/> 
         <!-- Anchor 3 -->
         <a id="chapter3"></a>
         <h3>Chapter 3</h3>
             Chapter 3 content <br/>
             Chapter 3 content <br/>
             Chapter 3 content <br/>
             Chapter 3 content <br/>
             Chapter 3 content <br/>
             Chapter 3 content <br/>
             Chapter 3 content <br/>
             Chapter 3 content <br/>
             Chapter 3 content <br/>
      </div>
      <p id="log-div"></p> 
   </body>
</html>

HashChangeEvent

HashChangeEvent is a sub- interface of interface Event. It represents the event that occurs when the "Anchor part" on the URL is changed.

Events:

Event	Description
hashchange	Event occurs when the "Anchor part" on the URL is changed.

Properties:

Property	Description
newURL	Returns the URL of the document, after the Hash has been changed
oldURL	Returns the URL of the document, before the Hash was changed

Basically, the newURL, oldURL properties of HashChangeEvent are supported by all browsers excluding IE.

Example with HashChangeEvent:

https://ex1.o7planning.com/javascript/hashchangeevents/hashchangeevents-example.html

hashchangeevents-example.html

<!DOCTYPE html>
<html>
   <head>
      <title>HashChangeEvent Example</title>
      <meta charset="UTF-8">
      <style>
        .content {
           margin-top: 30px;
           padding: 5px;
           border: 1px solid #ddd;
        }
      </style>
      <script>
          function hashchangeHandler(evt)  {
              var msg = "Hash Change! \n"
                     + "event.newURL= "+ evt.newURL +"\n"
                     + "event.oldURL= "+ evt.oldURL ;
              alert(msg);
          }
      </script>
   </head>
   <body onhashchange="hashchangeHandler(event)"> 
            <a href="#chapter1">Go to Chapter 1</a>
             ||
            <a href="#chapter2">Go to Chapter 2</a>
             ||
            <a href="#chapter3">Go to Chapter 3</a>
           <div class="content">
              <!-- Anchor 1 -->
              <a id="chapter1"></a>
              <h3>Chapter 1</h3>
                  Chapter 1 content <br/>
                  Chapter 1 content <br/>
                  Chapter 1 content <br/>
                  Chapter 1 content <br/>
                  Chapter 1 content <br/>
                  Chapter 1 content <br/>
                  Chapter 1 content <br/>
                  Chapter 1 content <br/>
                  Chapter 1 content <br/>
              <!-- Anchor 2 -->
              <a id="chapter2"></a>
              <h3>Chapter 2</h3>
                  Chapter 2 content <br/>
                  Chapter 2 content <br/>
                  Chapter 2 content <br/>
                  Chapter 2 content <br/>
                  Chapter 2 content <br/>
                  Chapter 2 content <br/>
                  Chapter 2 content <br/>
                  Chapter 2 content <br/>
                  Chapter 2 content <br/> 
              <!-- Anchor 3 -->
              <a id="chapter3"></a>
              <h3>Chapter 3</h3>
                  Chapter 3 content <br/>
                  Chapter 3 content <br/>
                  Chapter 3 content <br/>
                  Chapter 3 content <br/>
                  Chapter 3 content <br/>
                  Chapter 3 content <br/>
                  Chapter 3 content <br/>
                  Chapter 3 content <br/>
                  Chapter 3 content <br/>
           </div>
   </body>
</html>

Javascript HashChangeEvent Tutorial with Examples

1. HashChangeEvent

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ECMAScript, Javascript Tutorials

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