How to return an array from a Javascript function ?

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  • pankajit09
    Contributor
    • Dec 2006
    • 296
    #1

    How to return an array from a Javascript function ?

    Hello,

    How to return an array from a Javascript function ?

    For eg:

    Code:
    function test()
{
    var test1 = document.getElementsByName("textarea");

    return test1;
}
    Please correct the above code.
    Tags: None
    • acoder
      Recognized Expert MVP
      • Nov 2006
      • 16032
      #2
      If you want an array of the textareas on the page, change getElementsByNa me to getElementsByTagName.

        Comment

        • pankajit09
          Contributor
          • Dec 2006
          • 296
          #3
          Originally posted by acoder
          If you want an array of the textareas on the page, change getElementsByNa me to getElementsByTagName.

          No I want to extract textareas which have a specific name.


          Also tell me how to return associative arrays ?

            Comment

            • acoder
              Recognized Expert MVP
              • Nov 2006
              • 16032
              #4
              Then replace "textarea" in your original code to the name of the textareas.

                Comment

                • pankajit09
                  Contributor
                  • Dec 2006
                  • 296
                  #5
                  Originally posted by acoder
                  Then replace "textarea" in your original code to the name of the textareas.
                  That I am already doing .


                  Also tell me how to return an object.

                  For eg:

                  Code:
                  var obj = new Object(); 
obj["firstName"]=”vijay”;
obj["lastName"]=”khambalkar”;

                    Comment

                    • acoder
                      Recognized Expert MVP
                      • Nov 2006
                      • 16032
                      #6
                      If it's an array, use [] in place of "new Object()" and then after those statements, return obj; will return an array.

                        Comment

                        • pankajit09
                          Contributor
                          • Dec 2006
                          • 296
                          #7
                          Originally posted by acoder
                          If it's an array, use [] in place of "new Object()" and then after those statements, return obj; will return an array.

                          No I want to know how to return associative arrays ?

                            Comment

                            • acoder
                              Recognized Expert MVP
                              • Nov 2006
                              • 16032
                              #8
                              What does the following do?
                              [code=html]<html>
                              <head>
                              <script>
                              function test() {
                              var obj = [];
                              obj["firstName"]="vijay";
                              obj["lastName"]="khambalkar ";
                              return obj;
                              }
                              </script>
                              </head>
                              <body>
                              <script>
                              var t = test();
                              document.write( t["firstName"]);
                              </script>
                              </body>
                              </html>[/code]

                                Comment

                                • pankajit09
                                  Contributor
                                  • Dec 2006
                                  • 296
                                  #9
                                  Originally posted by acoder
                                  What does the following do?
                                  [code=html]<html>
                                  <head>
                                  <script>
                                  function test() {
                                  var obj = [];
                                  obj["firstName"]="vijay";
                                  obj["lastName"]="khambalkar ";
                                  return obj;
                                  }
                                  </script>
                                  </head>
                                  <body>
                                  <script>
                                  var t = test();
                                  document.write( t["firstName"]);
                                  </script>
                                  </body>
                                  </html>[/code]

                                  I want to send the array to a PHP file using Ajax.

                                  How to read the array in PHP ?

                                    Comment

                                    • acoder
                                      Recognized Expert MVP
                                      • Nov 2006
                                      • 16032
                                      #10
                                      Originally posted by pankajit09
                                      I want to send the array to a PHP file using Ajax.

                                      How to read the array in PHP ?
                                      Now it makes more sense what you're trying to do.

                                      Send it as a string with a unique delimiter and then split the string using that character with PHP.

                                        Comment

                                        • pankajit09
                                          Contributor
                                          • Dec 2006
                                          • 296
                                          #11
                                          Originally posted by acoder
                                          Now it makes more sense what you're trying to do.

                                          Send it as a string with a unique delimiter and then split the string using that character with PHP.

                                          For sending it as a string I have to traverse through the array, take each value and concatenate it.

                                          Is there any other way ?

                                            Comment

                                            • acoder
                                              Recognized Expert MVP
                                              • Nov 2006
                                              • 16032
                                              #12
                                              Use the join() method to put all the elements of an array into a string.

                                                Comment

                                                • pankajit09
                                                  Contributor
                                                  • Dec 2006
                                                  • 296
                                                  #13
                                                  Originally posted by acoder
                                                  Use the join() method to put all the elements of an array into a string.
                                                  But in that case will I get the keys also ?

                                                  Its an associative array.

                                                    Comment

                                                    • acoder
                                                      Recognized Expert MVP
                                                      • Nov 2006
                                                      • 16032
                                                      #14
                                                      Do you need the keys too?

                                                      Since it's an associative array/object, use a for...in loop:
                                                      [code=javascript]var obj = new Object;
                                                      obj["whatever"] = "something" ;
                                                      ...
                                                      var str = ""
                                                      for (var i in obj)
                                                      str+=obj[i] + ":";
                                                      [/code]

                                                        Comment

                                                        • pankajit09
                                                          Contributor
                                                          • Dec 2006
                                                          • 296
                                                          #15
                                                          Originally posted by acoder
                                                          Do you need the keys too?

                                                          Since it's an associative array/object, use a for...in loop:
                                                          [code=javascript]var obj = new Object;
                                                          obj["whatever"] = "something" ;
                                                          ...
                                                          var str = ""
                                                          for (var i in obj)
                                                          str+=obj[i] + ":";
                                                          [/code]

                                                          I know this way.

                                                          I wanted a way to return the associative array.

                                                            Comment

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