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POIs MVVM possible/viable in a DHTML RIA application (no Silverlight/WPF)?
 

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    <p>Note: This is a long winded question and requires a good understanding of the MVVM "design pattern", JSON and jQuery....</p> <p>So I have a theory/claim that MVVM in DHTML is <strong>possible</strong> and <strong>viable</strong> and want to know if you agree/disagree with me and why. Implementing MVVM in DHTML revolves around using ajax calls to a server entity that returns JSON and then using html manipulation via javascript to control the html.</p> <p>So to break it down. Lets say I'm building a search page that searches for People in a database.....</p> <p>The <strong>View</strong> would look something like this:</p> <pre> <code> &lt;body <strong>viewmodel="SearchViewModel"</strong>&gt; Search:&lt;br /&gt; &lt;input type="text" <strong>bindto="SearchString"</strong> /&gt;&lt;br /&gt; &lt;input type="button" value="Search" <strong>command="Search"</strong> /&gt; &lt;br /&gt; &lt;table <strong>bindto="SearchResults"</strong>&gt; &lt;thead&gt; &lt;tr&gt; &lt;th&gt;First Name&lt;/th&gt; &lt;th&gt;Last Name&lt;/th&gt; &lt;/tr&gt; &lt;/thead&gt; &lt;tbody&gt; &lt;tr&gt; &lt;td&gt;${FirstName}&lt;/td&gt; &lt;td&gt;${LastName}&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;/table&gt; &lt;/body&gt; </code> </pre> <p>Using some non standard attributes on my html elements, I have declaritively defined a <strong>View</strong> and how it will interact with my <strong>ViewModel</strong>. I've created a <strong>MVVM parser in javascript</strong> that interprets the non-standard attributes and associates the View with a JSON object that represents the ViewModel.</p> <p>The <strong>ViewModel</strong> would be a JSON object:</p> <pre> <code> //View Model SearchViewModel would be assocaited with View because of &lt;body <strong>viewmodel="SearchViewModel"</strong>&gt; var SearchViewModel = { //SearchString variable has a TwoWay binding //to &lt;input type="text" <strong>bindto="SearchString"</strong> /&gt;&lt; //if a user types into the text box, the SearchString property will "auto-magically" be updated //because of the two way binding and how the element was interpreted via my <strong>MVVM parser</strong> SearchString: '', //SearchResults has a OneWay binding to &lt;table <strong>bindto="SearchResults"</strong>&gt; SearchResults: new Array(), //Search function will get "auto-magically" get called because of //the command binding to &lt;input type="button" <strong>command="Search"</strong> /&gt; Search: function() { //using jquery to call into the server asynchronously //when the server call is completed, the PopulateSearchResults method will be called $.getJSON("www.example.com/SearchForPerson", { searchString: SearchViewModel.SearchString }, SearchViewModel.PopulateSearchResults); } PopulateSearchResults: function(data) { //set the JSON array SearchViewModel.SearchResults = data; //<strong>simulate INotifyPropertyChanged using the MVVM parser</strong> mvvmParser.notifyPropertyChanged("SearchResults"); } } </code> </pre> <p>The <strong>Model</strong> can be any server side asset that returns JSON...in this example, I used asp MVC as a restful facade:</p> <pre> <code> public JsonResult SearchForPerson(string searchString) { PersonDataContext personDataContext = new PersonDataContext(); //linq to sql..... //search for person List&lt;Person&gt; results = personDataContext.Persons .Where(p => p.FirstName.Contains(searchString) || p.LastName.Contains(searchString)) .ToList(); return Json(results); } </code> </pre> <p>So, again the question:<br> <strong>Is MVVM possible/viable in a DHTML RIA application (no Silverlight/WPF) or have I lost my mind?</strong></p> <p><strong>Could this "MVVM framework" be a good idea?</strong></p> <p><strong>Proof of Concept: <a href="http://kaboom.codeplex.com" rel="noreferrer">kaboom.codeplex.com</a>.</strong></p>
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