Question

Dynamically include a JavaScript file

Asked by: chen_avinadav

Let's say I have two buttons. When button 1 is clicked, I want the page to include the file button1.js, and when button 2 is clicked I want to include the file button2.js. Please note that I do not want to include all files at the beginning of the page; I know how to do this but it's not what I'm looking for.

Chen

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Asked On
2003-05-11 at 02:02:31ID20612556
Tags

dynamically

,

files

,

include

,

javascript

Topics

Web Languages/Standards

,

Server Side Includes (SSI)

Participating Experts
5
Points
125
Comments
12

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Answers

 

by: fargoPosted on 2003-05-11 at 04:38:06ID: 8503573

Hii,

use the following way...

<script type="text/javascript">

function LoadScript(url)
{
   var e = document.createElement("script");
   e.src = url;
   e.type="text/javascript";
   document.getElementsByTagName("head")[0].appendChild(e);
}

function change(src_url)
{
   LoadScript(src_url);
}

</script>

in the onclick button function...use the url u want to include...

hope this helps
thanks and regards
fargo

 

by: chen_avinadavPosted on 2003-05-11 at 05:19:06ID: 8503660

Does that work on all browsers?

Chen

 

by: avnerPosted on 2003-05-11 at 05:59:55ID: 8503749

No, fargo's  suggested code will work on Version 5 and up only.
What versions do you need to support ?

 

by: fargoPosted on 2003-05-11 at 06:09:38ID: 8503762

Hii,

Avner is correct...mine previous will work only for >IE5.
But, may be the following will help you...loads a script file with NN4, IE5+ and NN6.2+

<script type="text/javascript">
function LoadScript (url) {
  if (document.layers)
    window.location.href = url;
  else if (document.getElementById) {
     var e = document.createElement("script");
  e.src = url;
  e.type="text/javascript";
  document.getElementsByTagName("head")[0].appendChild(e);
}
}
</script>

Hope this helps
fargo

 

by: avnerPosted on 2003-05-11 at 06:23:55ID: 8503798

chen_avinadav,
Although you suggested you already know how to do it at load time, I have a feeling you are going to the wrong direction.
Maybe if you can describe the problem we can suggested a solution that will feet your needs.
Dynamically loading a JS is not something common to do and I can't really understand in what case this would be the choosen solution.

 

by: ahosangPosted on 2003-05-11 at 07:02:01ID: 8503907

just to clarify:
fargo's original method is good not just for IE5+, but also for all Gecko/Mozilla browsers(Netscape 6+)

 

by: chen_avinadavPosted on 2003-05-11 at 07:46:15ID: 8504020

Thank you fargo for your help so far.

Avner: Here's what I want to do... I'm using a script that is similar to this:
http://www.brainjar.com/dhtml/windows/demo.html
What I would like to do, is NOT load the content of every window at load time, because it would slow things down a lot. So what I had in mind was loading getdata1.js, that will define the variable window1 and I wil use that inside the window. Obviously this procedure only has to be done once per window.

I hope this makes things more clear. :)

Chen

 

by: dleblanc12Posted on 2003-05-11 at 09:40:01ID: 8504447

The following functions will allow a bit more compatibility with 4.x browsers, but will only be available -AFTER- the current javascript <script> blob has finished executing. The reason why I declare DEF_{filename w/o Extension}_JS is so that we won't include the same javascript file twice. It's a typical #INCLUDE senario very simular to that in C++ compilers.

Avner, this approach is very useful for developers of objects used in JavaScript. We only need to load the support files for the methods, properties, events and interfaces we need. This cuts down on the client page load times dramatically.

<!-- Begin Example HTML file -->
<html>
<head>
      <title>Sample Page</title>
      <script language="javascript" src="base.js" type="text/javascript"></script>
      <script language="javascript"><!--
            // Load myObjType definition
            _include("myObjType.js");
            
            // -->
      </script>
      <script language="javascript"><!--
            function init() {
                  var obj = new myObjType;
                  
                  //alert(_def("myObjType"));
                  
                  alert(obj.isDOM);
                  alert(obj.test("Hello "));
            }
            
            init();
            
            // -->
      </script>
</head>
<body>

<!-- Your Page Here -->

</body>
</html>
<!-- End Example HTML file -->

<!-- Begin base.js -->
/**********************************************************************************
*      FILE DEFINITION
**********************************************************************************/
var DEF_BASE_JS;

/**********************************************************************************
*      GLOBAL FUNCTION DEFS
**********************************************************************************/
function _defFunction(object, type, description) {
      try {
            if(description)
                  object.toString = new Function('return "['+type+'] Usage: '+description+'";');
            else
                  object.toString = new Function('return "['+type+']";');
      } catch(e) {
            // Fail and return
            return;
      }
}
_defFunction(_defFunction, "Function _defFunction", "Void _defFunction(Object object, String type, String description)");

function _def() {
      try {
            var args = arguments;
            if(args && args.length > 0) {
                  var _defA = null;
                  // Build a custom check for each argument
                  for(var ptr=0; ptr < args.length; ptr++) {
                        _defA = new Function('' +
                              'try {' +
                                    'if('+args[ptr]+') {' +
                                          'return true;' +
                                    '} else {' +
                                          'return true;' +
                                    '}' +
                              '} catch(e) {' +
                                    'return false;' +
                              '}');
                        if(!_defA())
                              // If the global variable doesn't exist, halt and return failure immediately
                              return false;
                  }
                  // _def will return true only if all watched global variables exist
                  return true;
            } else
                  // No arguments were passed
                  return false;
      } catch(e) {
            // There was an error during the check
            return false;
      }
}
_defFunction(_def, "Function _def", "Boolean _def(String expr1[, String expr2...exprN])");

function _include() {
      try {
            var args = arguments;
            if(args && args.length > 0) {
                  var filename = "";
                  var defName = "";
                  var ext = "";
                  for(var ptr=0; ptr < args.length; ptr++) {
                        filename = defName = args[ptr];
                        if(defName.lastIndexOf(".") > 0) {
                              ext = defName.substring(defName.lastIndexOf(".")+1, defName.length);
                              defName = defName.substring(0, defName.lastIndexOf("."));
                              defName = "DEF_" + defName + "_" + ext;
                              defName = defName.toUpperCase();
                              
                              if(!_def(defName)) {
                                    var Location = filename;
                                    if(_def("_BASE_PATH"))
                                          Location = _BASE_PATH + Location;
                                    document.writeln("<scr"+"ipt language=\"javascript\" src=\"" + Location + "\" type=\"text/javascript\"></scr"+"ipt>");
                              }
                        }
                  }
            }
      } catch(e) {
            // Fail and return
            return;
      }
      return;
}
_defFunction(_include, "Function _include", "Void _include(String expr1[, String expr2...exprN])");

/* PLEASE NOTE: The following two functions are only needed to simplify object support and are used in myObjType.js example */
function _addProperty(object, name, pProperty) {
      try {
            // Property has not been added, add it
            object[name] = pProperty;
            
            return;
      } catch(e) {
            // Fail and return
            return;
      }
}
_defFunction(_addProperty, "Function _addProperty", "String _addProperty(Object object, String name, *Unknown pProperty)");

function _addMethod(object, name, pfunction) {
      //try {
            // Method has not been added, add it
            var args = arguments;
            if(args.length < 4)
                  object[name] = new Function("return "+pfunction+"();");
            else {
                  var paramString = "";
                  var argCount = 0;
                  for(var ptr=3; ptr < args.length; ptr++) {
                        if(args[ptr].length > 2 && args[ptr].substring(0, 2) == "__") {
                              paramString = paramString + ", arguments["+argCount+"]";
                              argCount++;
                        } else
                              paramString = paramString + ", " + args[ptr];
                  }
                  paramString = paramString.substring(2, paramString.length);
                  object[name] = new Function("return "+pfunction+"("+paramString+");");
            }
            
            return;
      //} catch(e) {
            // Fail and return
      //      return;
      //}
}
_defFunction(_addMethod, "Function _addMethod", "Void _addMethod(Object object, String name, String pfunction, String expr4[, String expr5...exprN])");
<!-- End base.js -->

<!-- Begin myObjType.js -->
/**********************************************************************************
*      FILE DEFINITION
**********************************************************************************/
var DEF_MYOBJTYPE_JS;

/**********************************************************************************
*      CLASS IMPLEMENTATION
**********************************************************************************/
function myObjType_test(index, sample) {
      return index+sample;
}

/**********************************************************************************
*      INTERFACE DEFS
**********************************************************************************/
var myObjType = new Function('' +
      // Private members
      'this.pMembers = new Object;' +
      'this.pMembers.isDOM = (document.getElementById)?true:false;' +
      'this.pMembers.sample = "World!";' +
      
      // Define the Interface Properties
      '_addProperty(this, "isDOM", this.pMembers.isDOM);' +
      
      // Define the Interface Methods
      '_addMethod(this, "test", "myObjType_test", "__Index", "this.pMembers.sample");' +
      
      // Bind to requested interface
      'return this;');
_defFunction(myObjType, "Object myObjType");
<!-- End myObjType.js -->

 

by: whammyPosted on 2003-05-11 at 18:16:20ID: 8506192

brainjar is good, isn't he?

 

by: avnerPosted on 2003-05-11 at 21:55:48ID: 8506727

chen_avinadav,
For your needs the obvious solution would be IFRAME.
using IFRAME you can dynamically change the SRC attribute and point to different HTML files (you won't have to save the content of the page in  JS file).
If you need to support browsers back to NS4.x (god knows why..) you can use ILAYER that will also support the same thing.

 

by: chen_avinadavPosted on 2003-05-13 at 11:03:43ID: 8518889

whammy, what do you mean by that?

 

by: chen_avinadavPosted on 2003-05-13 at 11:08:07ID: 8518925

dleblanc12, after calling _include('test1.js') the script executes but the whole page disappears.

Chen

20120131-EE-VQP-002

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