Contents tagged with Module Development
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DNN World 2012
I just returned from DotNetNuke 2012 and wrote up a review of the experience at my Engage Software blog.
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DNN World 2011
We’re on the plane flying back to St. Louis from DNN World 2011. I gave a presentation titled DNN 6 UI/UX Patterns, discussing the form patterns introduced in the administrative modules in DNN 6 (the new look and feel that you immediately noticed after logging into your new DNN 6 site). Many folks asked about seeing the examples that I presented, and they are available as a repository on github, at https://github.com/bdukes/DNN-World-Demos. This includes a series of small, one-control modules that demonstrate the various parts and pieces introduced in DNN 6. I’ve also placed the slide deck on SlideShare, (though the vast majority of the content was just demonstration, don’t be expecting a wealth of information there). Feel free to let me know if you have any questions, and I’ll do my best to give clarifications.
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Why isn’t My Scheduled Task Executing?
A quick diversion from the JavaScript Common Difficulties and Misconceptions series (I have another post queued up, just need to write the sample code), for an issue I just ran into.
Created a scheduled task for DNN, but it’s sitting in the scheduler queue, just getting more and more overdue. Why won’t my task run?
Somehow I missed the constructor from the tasks I copied. Your task needs a constructor that takes a
ScheduleHistoryItemto run via the scheduler. -
Chicago Day Of DotNetNuke 2010 Recap
Saturday, October 2nd was the Day of DotNetNuke in Chicago. A number of us from Engage attended and spoke. I gave two presentations, which are now available on SlideShare (linked below). I’ve added some notes (be sure to click the “Notes on slide 1” tab when viewing on SlideShare) to give context if you weren’t able to attend the session.
Considerations with Writing JavaScript in your DotNetNuke® site Overall, we definitely were glad to participate in the event. The logistics were pulled off excellently (you certainly couldn’t tell that none of the organizers had organized an event of this magnitude before). I was also great to see the number of community leaders that were presenting and available. It really was a treasure-trove of DNN knowledge.
Nik Kalyani, the keynote speaker, did a great job of emphasizing the role that the community needs to play in guiding the development of DNN. A lot of us walked away excited about what we could contribute to move the community and platform forward.
Nik introduced the concept of a DNN Meme. This is an idea about DNN that catches on with the community in a way that it cannot be ignored. The basic idea is that if an idea is too good to resist, we need to share it so that something actually happens with it. Nik suggested that we use the hashtag #dnnmeme on twitter, and post bigger ideas to dnnmeme.com (via emailing post@dnnmeme.posterous.com). I’m not sure that the “DNN Meme” name is going to take off, but I can definitely get behind getting our ideas out there, gauging community interest, and pursuing the things that we all know that DNN needs.
In Nik’s session at the end of the day, we discussed a couple of things (documented on dnnmeme.com). The biggest of which was the need for module developers to get together and see where we can come to some agreements on how to implement our modules (whether that be a more standard set of markup/CSS, new features in the DNN core, or an agreement on how to implement large amounts of settings). Based on that discussion, Will Morgenweck created the DotNetNuke Module Standards project on CodePlex, where we can start the discussion of standardizing our approaches to modules.
If you are a module developer, we’d love your input on the patterns that you use when developing modules. Specifically, where you find yourself working around what the core provides, or find that the core doesn’t provide anything to support what you’re doing. We’ve gotten the discussion started with what we do and would like to do, but we need more voices so that we can come up with some real consensus on how to reconcile our different approaches.
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My Messages Inbox: A Mobile DotNetNuke Application for the St. Louis DNN Hackathon
This past week was the St. Louis DotNetNuke Hackathon. This was a competition for DNN developers to create a mobile application which interacts with DNN. We had one week to create something worth showing off. So, I, along with another developer at Engage, Abadi, took the challenge.
Abadi has experience developing games for Android phones, so we decided to write a Java application (rather than using Appcelerator’s Titanium Mobile product) which could connect with the Messaging feature introduced in DotNetNuke 5.3. If you have a DNN 5.3+ site, you’ll see a module titled “My Messages” on your profile page, which you can use to send messages to other users on the site.
As we were brainstorming what would make a good DNN mobile application, Rich Campbell, Engage’s president/CEO, tossed out the scenario of being notified of a football game being rained out. We all decided that going mobile would add a lot of value to DNN Messaging, and My Messages Inbox was born.
Before I go into the technical details, let me first point out that the Hackathon is currently in the voting phase (until tomorrow, August 31st, at 6:00 Central), so head on over to view the entries, and vote for your favorite!
So, technically, the application comes in two parts. I worked on an extension to your DNN site that enables communication with the Android application that Abadi wrote. The extension contains a WCF web service which allows a user of the site to authenticate and then get a listing of their messages. I’m very happy with how cleanly I was able to interface with the Messaging code (thanks, in large part, to the separation enforced by use of the Web Forms MVP pattern in the Messaging module). This was also my first big leap into using WCF, so it was great to be able to figure out how to integrate it with DNN without needing tons of configuration and setup (with much thanks to Justin Etheredge’s timely blog post on the subject, as well as Steve Fabian’s WCF DNN Security post).
Abadi was a wizard at figuring out the best way to integrate with the Android interface. He’d never worked with web services in Android before, so we had to catch up on how to get connected, how to parse JSON (and, especially, dates in JSON), and how to layout a standard interface. The most awesome feature of the entry, I think, is the ability for our application to check for new messages in the background, while you’re using other applications on your phone, and receive a notification (just like email). Since we were using Android itself, and not the common iPhone/Android abstraction that Titanium provides, we were able to take full advantage of the multi-tasking built into Android to make that happen.
Overall, it was a lot of fun, and a great learning experience all around. Many thanks for Pat Renner for his management, guidance, ideas, and filming (that’s his voice in the YouTube video), and for Anthony Overkamp for the great images we used on the Hackathon Entries page and the Codeplex site. Remember to go to the Hackathon page and vote!
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Embedding JavaScript and Other Resources In a .NET Assembly
One concept that I don’t see people using, understanding, or even being aware of much in .NET development circles is the Embedded Resource. Declaring a file as an embedded resource within your project means that it will be compiled into the assembly, so that you don’t have to distribute the actual file with the assembly.
In our projects, we embed many of the resources that we use, in order to reduce the number of files that we have to distribute. The biggest use of this policy is towards JavaScript files. We use a lot of JavaScript in our modules, but we don’t have to distribute any .js files, they all live in a .dll. This also makes it a lot easier to automatically minify the JavaScript files when building, but that’s a story for another time.
Down at the end of this post, I’ll also talk about embedding files that are intended to be loaded in memory to be used, rather than accessed through the web. In that case, it’s much more convenient to already have the file in the assembly, rather than having to search through the file system for it.
So, how do you invoke this magic to place regular, non-compiled files into your compiled assemblies? It all starts, as many things do, in Visual Studio. With the file added to your project, take a gander at the file’s properties (by pressing F4 if you don’t have some crazy keyboard setup). The property page for a file is rather short, and we need to look no farther than the first property of the file to accomplish our purpose. The Build Action property of the file is usually set to Content, meaning “[the] file is not compiled, but is included in the Content output group.” By changing this to Embedded Resource, “[the] file is embedded in the main project build output as a DLL or executable.” This is most of the magic we need, but we’re not quite done yet.
Since this is a JavaScript file that we’ll want to access on the web, we need to tell the assembly that it’s okay to give the web access to the file. If you miss this step, you’re going to get an error page instead of JavaScript when you try to reference it (and everything that depended on the script will be throwing errors both left and right).
So, to accomplish this, we need to add an assembly-level attribute. These usually live in the AssemblyInfo file, which, by default, is under the Properties folder of your project. After adding a
using/Importsof System.Web.UI, we can add the following WebResource attribute to our project (given a default namespace of “Engage.Demos.EmbeddedResources” and the file “swfobject.2.1.js” placed in a “JavaScript” folder):[assembly: WebResource("Engage.Demos.EmbeddedResources.JavaScript.swfobject.2.1.js", "text/javascript")]
So, this brings us to the issue of naming. The file is assigned a name when it is embedded into the assembly. This name is the default namespace of the project, plus the folder path, plus the file name itself, all joined together with periods. One important thing to note is that VB.NET assemblies do not have default namespaces (they have root namespaces, a source of continual confusion and frustration for C# programmers who switch back and forth). Therefore, the resource names just start with the folder path. In this case, the name would be
"JavaScript.swfobject.2.1.js".Now that we’ve handled that, how do we actually get the script on the page? The same way you get any script on the page, you use the ClientScriptManager (you do use the ClientScriptManager to manage your client scripts, right?). This is accessible through the page’s ClientScript property, from which you can call RegisterClientScriptResource (when using an embedded resource, you don’t get to choose whether it is a “startup script” [added at the bottom of the page] or “script block,” [added at the top1] it’s always a “block”, so you can’t use the ClientScriptManager if you want to use this technique for a “startup script”).
The RegisterClientScriptResource method takes a Type and the name of the resource. The Type, as far as I can tell, is just used to provide an additional “namespace” for the include, i.e. trying to include the same resource twice with the same Type will result in only one script being added to the page, but if they have different Types specified, the script’ll be added twice. So, in our case (working with a class called DemoPage), this looks like the following call during the page’s Load event:
this.Page.ClientScript.RegisterClientScriptResource(typeof(DemoPage),
"Engage.Demos.EmbeddedResources.JavaScript.swfobject.2.1.js");One notable time where this won’t work is when you are trying to add a script to the page during a partial postback. In truth, you’ll probably have the same issue whether you’re embedding your JavaScript or not, but either way, the fix is to move from the ClientScriptManager to the ScriptManager (great naming for these two, don’t you think?). For embedded scripts, use the static RegisterClientScriptResource method like you would with a ClientScriptManager instance, otherwise, pick between RegisterClientScriptBlock, RegisterClientScriptInclude, and RegisterStartupScript. When using the ScriptManager methods, you’re required to add a line to the end of your script to notify the manager control that you’re script is done loading, but if your script is embedded into the assembly, it can do it for you and you’ll never have to wonder why the stupid thing isn’t working the way (you think) it’s supposed to work.
If you have a case where you want to add a reference to an embedded script but the provided methods don’t work for you, you can use the ClientScriptManager.GetWebResourceUrl method to get a URL to that resource that you can use anywhere URLs are accepted, worldwide.
Now, finally, what about files that aren’t JavaScript? What if you have an XML schema that you want to load up to valid XML against? Or what if you have an image that you want to add as a watermark to user-uploaded pictures? In those cases, when you really want to load up the file within memory, rather than expose it to the web, the workflow is rather different. At the most basic level, you’re going to use Assembly.GetManifestResourceStream to get a stream of the file. The easiest way to get an assembly reference is to start with the type you’re in, and then access its Assembly property, like so:
using (var schemaStream = typeof(DemoPage).Assembly.GetManifestResourceStream(typeof(DemoPage),
"Schemas.DemoSchema.xsd"))
{
// validate something...
}One further note about naming. In this situation, the first Type parameter is used to lend its namespace to the resource, so, in this case, since the full name of DemoPage is Engage.Demos.EmbeddedResources.DemoPage, I don’t have to specify the Engage.Demos.EmbeddedResources part of the resource’s name.
From there, you can go wild, doing whatever you want to do with the stream of your file.
Hopefully this clears some things up, and hopefully introduces you to a tool that you may not have known about or may not have known enough about. Make sure and let me know if you have any questions, or see any better ways to go about this stuff.
1 The ClientScriptManager actually only messes with the form element on the page, so it’s really the top and bottom of the page’s form that’s where the scripts get placed.
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Compile Error Message HTML
Server Error in '/dotnetnuke_2' Application.
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: BC30451: Name 'Initialize' is not declared.
Source Error:
Line 81:
Line 82: ' stop scheduled jobs
Line 83: Initialize.Init(app)
Line 84:
Line 85: ' log APPLICATION_END event
Source File: C:\Inetpub\wwwroot\DotNetNuke\Website\App_Code\Global.asax.vb Line: 89
Show Detailed Compiler Output:Show Complete Compilation Source:
Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433
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Packaging Modules for DotNetNuke 5
So, the first thing I noticed when testing Events in [DNN] 5 was that it seemed like some of our shared base assemblies weren't being updated to the latest version that comes with Events. Looking into it further, I realized that those assemblies were associated with the other Engage module I had installed on the site, Engage: Locator. The short story is that [DNN] now keeps track of assemblies when you install them, to help keep assemblies from being uninstalled or overwritten incorrectly. When you install a [DNN] 4 module, it appears that it sets the version of the assemblies that it installs to the version of the module. So, I had installed Locator 1.4, which gave Engage.Dnn.Framework.dll a version of 1.4.0 in the [DNN] database. When I installed Events 1.1, [DNN] thought it was an older version of Engage.Dnn.Framework.dll (1.1.0), even though it was actually the most recent version.
So, to help fix this as much as we could, I decided it was time to figure out this 5.0 packaging stuff and create a 5.0 package for Engage: Events. First, I asked [DNN] to make a module package of Events, based on the [DNN] 4 package I had installed. I looked through that and updated and removed parts to get it closer to what we wanted. Specifically, I removed the <eventMessage> section from the Module component, since... I couldn't figure out any reason we'd need that. I think it might be necessary now if you implement IUpgradeable, but it's best to try it out for yourself.
I also removed all of the files other than scripts, cleanup, and assemblies, since we use a Resource File .zip to avoid having to change the manifest whenever the content files in the module change. In [DNN] 4 manifests, this looked like a <resourceFile> element in the <folder> element for your module, pointing to the file to unzip with all of your files. In [DNN] 5, that didn't work. After a bit of searching, I found Erik's blog post, DotNetNuke 5 Extention Packaging. This helped my a ways along my path, showing that these Resource File .zips have their own section in the manifest file. After a bit of trying to figure out why his example wasn't working for me, I figured out that he'd left out one of the elements (the interior <resourceFile>) in the XML. With that figured out, my section looks like this:
<component type="ResourceFile">
<resourceFiles>
<basePath>DesktopModules/EngageEvents</basePath>
<resourceFile>
<name>Resources.zip</name>
</resourceFile>
</resourceFiles>
</component>
Back to the first issue I had experienced, I could now specify my own versions for the assemblies that I included in the package. This isn't necessarily a magic bullet, though, until all of our modules have a [DNN] 5 package. This is because the correct version of some of the shared assemblies (e.g. Engage.Dnn.Framework.dll) is still lower than the version of some of our [DNN] 4 modules. (For example, the version of Engage.Dnn.Framework.dll released with Events is 1.1.0, but the latest version of Locator is 1.4.0). So, if those are installed, we'll see the same inability to overwrite the shared assemblies with newer versions. But, this is the first step towards getting there. Accurate information is better than inaccurate, in my book.
The next change to be made to the generated manifest is to fill in the <owner> section at the top of the package. We can supply a <name>, <organization>,<url>, and <email> that is shown when the module is installed. This makes sure people know who wrote the module and how to find us. From Erik's post, I also found out that you can include HTML in those fields, so you can make the <url> and <email> links, rather than plain text. Our section looks like this:
<owner>
<name>Engage Software</name>
<organization>Engage Software</organization>
<url><![CDATA[<a href="http://www.engagesoftware.com/">http://www.engagesoftware.com/</a>]]></url>
<email><![CDATA[<a href="mailto:support@engagemodules.com">support@engagemodules.com</a>]]></email>
</owner>
The last bit of new functionality in the manifest that I worked with is the License and Release Notes. These are new fields that users see when they install the module. We were already including a copy of the license in our [DNN] 4 packages, but now we can link to that file and make sure that users explicitly agree to it before installing the module. We also keep release notes on our website that we can now show upon install, rather than making folks search for them.
So, at this point, I think I'm done with this process. However, I try to install, and see the following:
Tracking this down, I realized that I had deleted elements with default values in the <moduleControls> section of the manifest. I didn't want to have a <viewOrder> element making it seem like someone was specifically setting that value, when really we don't care, it's just a default. Well, one of the elements I deleted was <controlKey> from the default module control. This is how our [DNN] 4 manifest looks, since the default module control doesn't have a key assigned. Looking at the error, it looked like that was no longer an acceptable practice, so I added a <controlKey/> to that <moduleControl> entry, and it worked like a charm. And, really, that makes sense. I care that <controlKey> is empty, I'm not just accepting the default value for lack of a better value, I'm actively choosing to use an empty <controlKey>.
So, those are the hassles, issues, and features that I encountered while creating a [DNN] 5 package for our module. Hopefully this'll give you some better understanding of some of what's involved, and get you more quickly around those obstacles that I ran up against.
[Cross-posted from http://www.engagesoftware.com/Blog/EntryId/194/Packaging-Modules-for-DotNetNuke-5.aspx]
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Understanding Module Isolation in DotNetNuke
Also known as "Why Did My Skin Just Change?" and "Why Doesn't NavigateURL work?"
When navigating to between controls within your [DotNetNuke] module, you have many options (and would do well to read Michael Washington's Module Navigation tutorial on the subject).
If you decide to use the built-in navigation mechanisms, when you want to navigate to your control with the key "EditItems", you'd get the URL by calling
EditUrl("EditItems")(or one of its overloads, depending on what other information you need on the querystring). This method returns a new URL with three pieces of information on it: the current page (tabId), the current module (mid), and the control key your provided (ctl).Here's where we encounter module isolation. When "mid" is on the querystring, [DNN] loads only that module on the page. If you try to avoid this by using the NavigateURL method instead of EditUrl, [DNN] won't know which module to load the control for, so it won't load anything.
In addition to not showing the other modules that are usually on that page, one of the biggest side effects of module isolation that you'll notice is that your skin and container change. When in module isolation, the admin skin and container are used (
though, starting in [DNN] 5.0, there is no longer an admin skin, so this shouldn't be an issue going forwardstarting in [DNN] 5.0, these are called the edit skin and container, rather than "admin"). If you have a different admin skin, this can be quite jarring to you and your users.If the consequences and side effects of module isolation work for you/your customers/your users, then it is definitely the easiest method of getting around your module's controls. However, it has its drawbacks. If you need more control, again, check out Michael Washington's Module Navigation tutorial.
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Get Module by Module ID in DotNetNuke
When building [DotNetNuke] modules, a number of times I've run up against the issue of trying to instantiate a ModuleInfo instance with only a module ID. However, the GetModule signature on ModuleController takes both a module ID and a tab ID. In this latest instance where I've come against this issue, I was actually trying to get a tab ID based on the module ID, so I obviously didn't already have one to provide.
As I started to move down the road of writing my own query to get this simple thing done, I found that the GetModule method and underlying query will take a "null" value for the tab ID! Unbeknownst to me, the solution was right in front of me, right where I expected it to be the whole time, I just couldn't see it.
So, if you need a ModuleInfo instance and you only have a module ID, call GetModule(moduleId, Null.NullInteger) and you're good to go!
(I've put in a request with the people in charge to add an overload to GetModule so that this is more obvious going forward)
