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elements within a context (for example, $('input:button', someContainer)) Create HTML dynamically (for example, $('<span>updating...</span>')) Extend an existing element with jQuery functionality (for example, $(textbox))
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To have some code executed when the DOM is ready, rather than putting the script at the bottom of the page you can put it in the <head> like this:
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$(document).ready(function() { /* your code here */ });
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The preceding line is the same as this:
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$().ready(function() { /* your code here */ });
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It can be shortened even further, like so:
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Ajax in ASP.NET MVC
There s usually a shorter way of doing anything in jQuery. The nice thing about $(document).ready is that it will fire as soon as the DOM is loaded, but it doesn t wait for images to finish loading. This results in a faster startup time than with window.onload. The $.ajax([options]) function can be used to send Ajax requests to the server. The $.get() and $.post() functions are also useful simplifications of the $.ajax() function. To serialize a form s values into name1=val&name2=val2 format, use $(form).serialize(). This just scratches the surface. For a real introduction to jQuery, visit the jQuery website (http://docs.jquery.com). I also highly recommend the book jQuery in Action by Bear Bibeault and Yehuda Katz for more serious studies. Our first example in this chapter used a button click to fire the request. There were no parameters sent to the server, so the same message would always be returned. This is hardly a useful way to build Ajax applications. A more realistic approach (and one that s quite popular) is to take a form and hook into the onsubmit event. The form values are sent via Ajax instead, and the standard form submission is canceled. Jeremy Keith (author of the excellent DOM Scripting book) calls this technique Hijax.
12.3.2 Implementing the Hijax technique
The following example will be a conference application. This application will manage local, one-day conferences, and the conference administrator needs to be able to add sessions to the conference. We ll implement the Hijax technique. Let s take a look at the user story for this feature: As a potential speaker, I would like to add sessions to the conference (with a name and description) so that the organizer can review them and approve the ones that fit. I would like the interaction to be seamless so that I can add multiple sessions very quickly.
NOTE
If you aren t familiar with user stories, they re small requirements artifacts used in iterative development methods. You can learn more at http://en.wikipedia.org/wiki/User_story.
Figure 12.2 shows a form where viewers can add sessions to a conference. It consists of two text boxes, a drop-down list, and an Add button to submit the form. When the form is submitted, a session is created and added to the conference, and the page is rendered again with a styled list of current tracks. When you submit the form, the session is added, and the user is redirected back to /session/index to view the updated table. The markup in this view is shown in listing 12.4.
Ajax in ASP.NET MVC
Figure 12.2 These form values are serialized and sent to the server via Ajax. The result is a seamless method of adding sessions without a page refresh. When you disable JavaScript, it continues to work, but with page refreshes.
Ajax in ASP.NET MVC
Listing 12.4 The view, which remains simple
<% using(Html.BeginForm( "add", "sessions", FormMethod.Post, new {@class="hijax"})) { %> <fieldset> <legend>Propose new session</legend> <label for="title">Title</label> <input type="text" name="title" /> <label for="description">Description</label> <textarea name="description" rows="3" cols="30"></textarea> <label for="level">Level</label> <select name="level"> <option selected="selected" value="100">100</option> <option value="200">200</option> <option value="300">300</option> <option value="400">400</option> </select> <br /> <input type="submit" value="Add" /> <span id="indicator" style="display:none"><img src="../../content/ load.gif" alt="loading..." /></span> </fieldset> <% } %>
It s important to ensure that your application works without Ajax, because your users might decide to run with JavaScript turned off, or they might be using a mobile browser without JavaScript support. Our example works, so we can now focus on spotwelding Ajax onto this form without touching the HTML. We can apply a simple jQuery script that will hijack this form post and provide the seamless Ajax experience instead (when the user has enabled JavaScript). This is called progressive enhancement. Let s see how that s implemented. When the user clicks the Add button, the browser physically posts to the server. We need to cancel this action so the browser doesn t go anywhere. If we add an onsubmit JavaScript handler to the form and call event.preventDefault(), we can capture the form post and circumvent the actual post operation. We can then gather the form values and submit the form post instead with Ajax. Listing 12.5 shows the setup for the JavaScript.
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