Table Of Content

Javascript HashChangeEvent Tutorial

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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:
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>

 

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