Posts Tagged ‘javascript’

Note:

Instead of editing my previous post to pieces, I thought it might be best if I repost my script with a better description of how it works. I’ve written up documentation of the script on the CornEmpire Software wiki which is available at http://wiki.cornempire.net. The documentation directly related to this script is available at http://wiki.cornempire.net/doku.php?id=d2l:bulkdeactivate

Introduction

One of the often requested features is to be able to bulk deactivate courses in D2L after they have completed. You can currently deactivate courses, but this is a one at a time effort. This has become more important as version 8.3 of D2L brought along a new My Courses widget, which allows users to see updates from each of their courses. Unfortunately, when course access ends, they can still see the updates. This has caused confusion for many users.
Another reason to deactivate courses is minimize the amount of clutter in the view of users. If course access has ended, and they cannot access the course, there is no need for the course to remain active (this could vary depending on how your roles are configured). A way around this is to script the bulk deactivation of courses. Through the use of some Javascript coding, we can instruct the web browser to visit each course, and deactivate it for us.

See the script in action.

Would you like to see more? I have the script, and it’s documentation available on this page: http://wiki.cornempire.net/doku.php?id=d2l:bulkdeactivate

If you have any questions, please post them below.

Update

Please see my new post on this topic. Available at: http://www.cornempire.net/2009/07/07/d2l-bulk-deactivation-part-2/

Introduction

One of the often requested features is to be able to bulk deactivate courses in D2L after they have completed. You can currently deactivate courses, but this is a one at a time effort. This has become more important as version 8.3 of D2L brought along a new My Courses widget, which allows users to see updates from each of their courses. Unfortunately, when course access ends, they can still see the updates. This has caused confusion for many users.

Another reason to deactivate courses is minimize the amount of clutter in the view of users. If course access has ended, and they cannot access the course, there is no need for the course to remain active (this could vary depending on how your roles are configured). A way around this is to script the bulk deactivation of courses. Through the use of some Javascript coding, we can instruct the web browser to visit each course, and deactivate it for us.

Example

Take a look here for this script in action.

If you think that this might be useful for your organization, you can download the html file which includes the javascript.

For D2L Version 8.3
For D2L Version 8.4 (Thanks Dennis!)

Instructions on Use

• You will need to edit the file and modify line 5. This contains the URL to your learning environment, and the URL to your Course Offering Information screen.
• This file will need to be placed in one of your courses in your learning environment in the Manage Files area.
• You need to open the file from your Manage Files section and provide the script with the OU numbers of the courses you need to deactivate. (Take a read below to see how we get the ou numbers)
• Once the OU numbers are loaded, you can click the Start Processing button and your web browser should go to all the courses and deactivate them.

Limitations

• You are required to have administrative access to any courses you need to deactivate (I haven’t been able to figure out why this is, but a javascript error is thrown if you do not have admin access)
• This has been tested in Firefox 3 on Windows XP and Ubuntu 9.04 as well as a Chrome Development Beta for Linux but may not work in other web browsers (especially IE).
• This has been tested on D2L Version 8.3 MR01. I’d suspect it would work on any version of 8.3 but not sure about 8.4 yet, or any earlier versions.
• I’m not responsible if this code melts your CPU. or causes any other horrible damage to your D2L installation (although it shouldn’t….it’s only about 35 lines of Javascript. :p)

Getting a List Of Courses

The tricky part in all of this is actually getting the OU numbers for each of the courses you need to deactivate. For those who don’t know, the OU number is the org unit number, and is an internal identifier for D2L. You will notice the ou number in the URL of courses as ou=#####.

We run a report using the reporting tool that gives us the ou numbers (in one, non-ideal form. Hopefully D2L web services will eliminate the need for this).

In the Reporting tool, create a report using the Org Units dataset. With in the report, include the column for the course Path. This path contains the OU number for the course. Under the filter tab, add a few filters that will narrow down your search to the information you require. Our organization adds a semester code to all of our courses, so all courses that end in 200802 are courses that ran in the last semester. We can query these courses, and get a list of the ou numbers through the course offering paths. See below for some images of our report in action.

Then you have to do some work in manipulating the report to filter out the OU numbers. I select the whole column using firefox, and dump it into OpenOffice. Customize the import to break the lines on all of the dividing characters, and then I have a column of ou numbers. Then take that, and add in commas after all of the entries using a find and replace. You will need a text editor that can find and replace on characters you cannot see. Replace the new lines with commas.

Hopefully you can find a better way to get your list of OU numbers . If you have a good way, leave a comment and let me know.

I’ve been recently doing some Javascript coding and ran across an error in IE that I wasn’t noticing in Firefox (well…there are hundreds of these, but this one is a show stopper).

It is a small validation script for a form to do some checking before submitting.  It’s pretty simple, take a look:

function validateForm(){
	/*
	 * First, get the fields.
	 */
	var name = document.getElementById('name').value;
	var title = document.getElementById('title').value;
	var phone = document.getElementById('phone').value;
	var email = document.getElementById('email').value;
	var description = document.getElementById('description').value;
	var cost = document.getElementById('cost').value;
	//pic1 = document.getElementById('pic1').value;
	//pic2 = document.getElementById('pic2').value;
	if(name == ""){
		alert('You must enter your name.');
	}
	else if(title == ""){
		alert('You must enter give your ad a title.');
	}
	else if(phone == "" && email == ""){
		alert('You must enter a phone number or email address.');
	}
	else if(description == ""){
		alert('You must enter a description of the item you want to buy, sell or trade.');
	}
	else if(isNaN(cost)){
		alert('You must enter a numeric cost, without the $ symbol.');
	}
	else{
		document.getElementById('submit').style.display = 'block';
		alert('Please press the submit button below.');
	}
}

Executing the script on a blank form in FF would give the correct response, Enter in a name. In IE, I would get an error on Line 15 about Object Expected (in the script, line 15 is actually a commented out line, so that error isn’t very helpful).

I then remembered something about IE automatically creating variables from a form by the name/id of the form field on the page. Since my variable name, and field name were the same, it would try to compare its self created object against my test, instead of the variable that I was assigning, thus creating an error.

To work around this, I had to rename all of my variables (I could have also renamed all of my fields):

function validateForm(){
	/*
	 * First, get the fields.
	 */
	var bsname = document.getElementById('name').value;
	var bstitle = document.getElementById('title').value;
	var bsphone = document.getElementById('phone').value;
	var bsemail = document.getElementById('email').value;
	var bsdescription = document.getElementById('description').value;
	var bscost = document.getElementById('cost').value;
	//pic1 = document.getElementById('pic1').value;
	//pic2 = document.getElementById('pic2').value;
	if(bsname == ""){
		alert('You must enter your name.');
	}
	else if(bstitle == ""){
		alert('You must enter give your ad a title.');
	}
	else if(bsphone == "" && bsemail == ""){
		alert('You must enter a phone number or email address.');
	}
	else if(bsdescription == ""){
		alert('You must enter a description of the item you want to buy, sell or trade.');
	}
	else if(isNaN(bscost)){
		alert('You must enter a numeric cost, without the $ symbol.');
	}
	else{
		document.getElementById('submit').style.display = 'block';
		alert('Please press the submit button below.');
	}
}

After this, it runs fine in both browsers. I remember hitting my head off the wall for a LONG time when I originally encountered this error, so hopefully this will save someone else some time.

Introduction

The picture library built into Desire2Learn doesn’t allow for instructors to create their own libraries. Rather, all images are shared across all courses. I wrote this bit of javascript to simulate and extend the idea of a picture library in D2L (this code can also be used for any HTML page). There are two parts to the library:

The Widget Code (or HTML code for any page)

This code is the skeleton of the library. The javascript code modifies this code in order to display the images.

The Javascript Code

This is the brain of the library. It must be installed somewhere locally and linked to the widget/HTML page. There is a configuration section at the top of the file where you can configure the library.

Here is the widget/HTML code that must be displayed on the pages.
You should not edit this code as it will cause the library to malfunction.

<html>
<head>
	<script src="picturelibrary.js" type="text/javascript"></script>
</head>
<body>

	<div id="imgwdgt">
		<img src="piclibimages/test.png" id="imghldr" />
		<p id="imgcptn"></p>
	</div>
	<script type="text/javascript">
		startLibrary();
	</script>

</body>
</html>

Here is the javascript code: picturelibrary.js
You will need to right click this link and save the file to your computer before you can upload it to your D2L shell/website.

Notes About The Code

Not all the variables need to be set a certain way in order for the code to function. However, it is a good idea to set up any variables that you don’t want to use to be false. Some variables require others, so read the comments in the code carefully. I’ve also included them below:

/**
	This script presents a picture library to the user.  It has several configurable
	options which are outlined below.
	With this script, you can:
		1) Present a slide show to users
		2) Present a navigatable interface for users to scroll through the library
		3) Release an image to them based on a set date/time
		4) Release a random image from the library
**/
/**
	=== CONFIG START ===
	Here you need to specify the path to this script.  To do this you must go to the
	Edit Course section of the site, and go to Manage Files.  Then, copy the URL for
	this javascript file.  Paste the URL into the variable below.  Then remove the
	filename at the end of the URL "picturelibrary.js".  Replace the file name with
	"piclibimages/" (no quotes)
*/
var path = "http://online.mun.ca/content/Sandbox/TT/Sp07/piclibimages/";

/**
	List your images here.  By default, it will look under the piclibimages folder
	in your course files.  Change the path above if you want to load from a different
	location.

	Place the file names in the array below.  A comma must be placed after each entry
	except for the last entry in the list.
*/

var images = new Array(
	"dataspace-code.gif",
	"MedSchoolCrestSmall.gif",
	"crest-toothpaste.png"
);

/**
	List your captions here.  

	If you enable captions below, you must have at least as many captions as you have images
	above or you will probably get a javascript error when the script scrolls through the
	images.  You can have blank captions, denoted with "" in the array below.
*/
var captions = new Array(
	"The icon I created for the phpLive -> Dataspace integration.",
	"Medicine School Crest",
	"Crest Toothpaste"
);

/**
	This array contains dates for the date release function of this script.  If you do not
	want to use date release, you can leave this blank.

	Each entry goes with an entry in the images array and should be formatted with
	the startdate-enddate for the image.  Only one image can be displayed at a time
	with this method.
	A sample entry is: 200809190000-200809222359
		This will allow the	image to be viewed on Friday the 19th until Monday the 22nd.

	If you want your images	to rotate through a day, you can place a * for the date and
	just include the time.
	A sample entry is: *0000-*1200
		This will allow your image to appear on the site between midnight and noon every
		day.
*/

var releasedates = new Array(
	"*0000-*1230",
	"*1231-*1300",
	"*1301-*2359"
);
//var releasedates = new Array(
//	"200809170000-200809182359",
//	"200809190000-200809202359",
//	"200809210000-200809222359"
//);

/**
	Here you can set your options for the script.
	resize = controls if images are automatically resized.  If true, width and
			 height must be set.  These are measured in pixels.  Be careful using this
			 as it will likely distort your pictures horribly.  It is much better to
			 resize your pictures before uploading them to the system.
	navigation = controls if users can navigate through images, or if they see
				 a loop of images.
	imagepause = the amount of time in milliseconds that an image appears before
				 changing.  Only used if navigation is false. 4000 = 4 seconds
	captionsdisplay = if this is set to true, the caption is pulled from the above array
			   		  and displayed with the picture.
	daterelease = Shows an image on a specific date/for a specific time.  The datearray
			      must store the dates in the format yearmonthday-yearmonthday or *time-*time.
			      the first date/time being when the image is displayed, and the second
			      when it ends.
	imagestyle = This is a CSS style tag that will be added to the image tag.
	captionstyle = This is a CSS style take that will be added to the caption.
	widgetsytle = This is a CSS style tag that well be added to the div around the image
				  and caption.
	randomstart = This variable controls whether or not the script begins on a random image.
	singlerandom = If true, this displays a single random image when the page is loaded.
*/			      

var resize = false;
var width = "";
var height = "";
var navigation = true;
var imagepause = "5000";
var captionsdisplay = true;
var daterelease = true;
var imagestyle = "margin: 0 auto; display: block; padding: 2px;";
var captionstyle = "margin: 1px; text-size: 10px; text-align: center; border: 1px dashed gray;";
var widgetstyle = "border: 2px solid black;";
var randomstart = true;
var singlerandom = false;

/**
	=== CONFIG END ===
	This is the end of configurable items for this script.  Do not edit the code below.
*/

Also of note is the use of CSS styles. I cannot figure out how to apply an arbitrary CSS style string to an HTML element. I can change specific things, but I cannot allow any style tags. If anyone knows how, please contact me.

Because of this limitation, the CSS code will only recognize:

• border
• text-align
• font-size
• margin
• display
• padding

You can add in your own code to the bottom by editing the doStyle function, or you can apply your own styles to the raw widget/HTML code. You must leave the style variables blank in this script.

Final Thoughts

I hope you find this useful, either for your D2L course, or for your personal homepage. I’ll probably post updates from time to time on this script depending on the feedback I receive. If you have any comments, you can leave them below. Take a look at some of the variable configurations below to see examples of how the code can be used.

Examples