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JavaScript Arrays: Pushing, Popping and Shifting


This series of articles mainly concentrates on working with JavaScript arrays. This is the fourth article in the series and mainly concentrates on working with multiple arrays effectively. You can reuse these scripts to inject into server side controls easily (especially in .NET and Java).

Author Info:
By: Jagadish Chaterjee
Rating: 4 stars4 stars4 stars4 stars4 stars / 35
March 21, 2006
TABLE OF CONTENTS:
  1. · JavaScript Arrays: Pushing, Popping and Shifting
  2. · How to append an element to an array using JavaScript: discussion
  3. · How to pop (or delete at end) an element from an array using JavaScript
  4. · How to delete an element at the top from an array using JavaScript
  5. · How to add an element to the top of an array using JavaScript

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JavaScript Arrays: Pushing, Popping and Shifting
(Page 1 of 5 )

I already covered single dimensional and two dimensional arrays in my first article.  If you are new to JavaScript arrays, I strongly suggest you go through that article.  All of the examples in this series can be directly tested, by simply copying and pasting the entire code (of each section) into any text file with the extension .HTM and opening it using a browser.

How to append an element to an array using JavaScript

I already covered different kinds of arrays in my first article.  I explained combining (joining) and splitting of arrays in my second article.  The third article covered copying, transferring and merging data.  And in this section I focus on “pushing” (also called “appending”) an element to an array.

Now, let us try to develop a simple script (JavaScript) which adds (or pushes) a single element at the end of an array.  Have a look at the following code:

<html>
      <head>
            <meta  name=vs_targetSchema  content="http://schemas.microsoft.com/intellisense/ie5">
<script  id="clientEventHandlersJS"  language="javascript">
<!--
functionShow()
{
      var myArray = new Array();
      myArray[0] = "Jag";
      myArray[1] = "Chat";
      myArray[2] = "Win";
      myArray[3] = "Dhan";
      document.write("Before adding<br>-------------<br>");
      for (var i = 0; i < myArray.length; i++) 
      {
            document.write(myArray[i] + "<BR>");
      }
      myArray.push("aaa");
      document.write("<br>After adding<br>-------------<br>");
      for (var i = 0; i < myArray.length; i++) 
      {
            document.write(myArray[i] + "<BR>");
      }
}

function ButtonPush_onclick() {
      Show();
}
//-->
            </script>
      </head>
      <body>
      <form  id="form1">
                  <input  type="button"  value="Push and Show"  id="ButtonPush"  name="ButtonPush"  onclick="return ButtonPush_onclick()">
            </form>
      </body>
</html>

Actually, within the above code, the “meta” tag is not necessary.  Because I developed the above code using Visual Studio.NET 2003 Enterprise Architect, it was automatically added to provide its full-featured mechanisms. 

When the above code is executed we get the following output:

Before adding
-------------
Red
Green
Blue
White

After adding
-------------
Red
Green
Blue
White

aaa

The explanation for the above code is in the next section.


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