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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.

A web server gives a cookie to a client by including a Set-Cookie field in an HTTP response To illustrate, consider the preceding solution, in which we used session-ids to serve as pointers to state in the web server s database Instead of sending the session-id from the server to the client as a hidden form field, we could have sent a cookie as follows: HTTP/10 200 OK Set-Cookie: session-id=3927a837e947df203784d309c8372b8e; secure <HTML> <HEAD> <TITLE>Pay for Pizza</TITLE> </HEAD> <BODY> <FORM ACTION="submit_order" METHOD="GET"> The total cost is 550 Are you sure you would like to order <INPUT TYPE="submit" NAME ="pay" VALUE="yes"> <INPUT TYPE="submit" NAME ="pay" VALUE="no"> </BODY> </HTML> We show the HTTP response header in addition to the confirmation form issued by the server to illustrate the use of the Set-Cookie HTTP response header field, whereas we typically did not need to show the HTTP response header in previous examples.

The user selected a different item from the list, or your code made a call to gtk_combo_box_set_active_iter(). This signal will also be emitted when the user types into a GtkComboBoxEntry.

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.

Note that in addition to the session-id specified in the cookie, a secure attribute is used to specify that the client should only send the cookie back to the server over an SSL connection In the preceding example, when the user clicks the submit button, the browser sends the following HTTP request to the server: GET /submit_order pay=yes HTTP/10 Cookie: session-id=3927a837e947df203784d309c8372b8e The algorithm that the server uses to process the order is still more or less the same, except that the value of the session-id variable is retrieved from the cookie instead of the URL parameters In general, using a cookie is different from using hidden form fields because a wellbehaved browser will typically send the cookie back to the web server on each HTTP request, without requiring a form submission or tacking on additional parameters to the URL.

A child widget was added or packed into the container. This signal will be emitted even if you do not explicitly call gtk_container_add() but use the widget s built-in packing functions instead. The container checked whether it needs to be resized before adding a child widget. A child widget was removed from the container. A container s child widget gained focus from the window manager.

<% 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> <% } %>

A call was made to gtk_curve_set_gamma(), gtk_curve_reset(), or gtk_curve_set_curve_type().

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.