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When the text is surrounded by an HTML comment (<!-- -->), the HTML parser doesn t attempt to process the special characters Now let s discuss the use of an iframe element as a content block For reference purposes, an iframe element is a combination of a div or span element and the XMLHttpRequest object An iframe element is like an HTML frame, except the frame can float on the HTML page For example, when writing the tests for the pages of this book, the test page would contain an iframe that references the page to be tested With iframe, you re delegating the responsibility of retrieving and displaying the content to the frame In turn, this gives you less control over how the content is retrieved and displayed Figure 3-14 illustrates the new Ajax-enabled Yahoo! Web client, which uses iframes extensively.

messages = new Label(); Controls.Add(messages); } protected override void RenderWebPart(HtmlTextWriter output) { try { //Bind results grid.DataSource = results; grid.DataBind(); } catch(Exception x) { messages.Text += x.Message; } //Display GUI output.Write("<TABLE BORDER=0>"); output.Write("<TR>"); output.Write("<TD>"); keywords.RenderControl(output); output.Write("</TD>"); output.Write("</TR>"); output.Write("<TR>"); output.Write("<TD>"); search.RenderControl(output); output.Write("</TD>"); output.Write("</TR>"); output.Write("<TR>"); output.Write("<TD>"); grid.RenderControl(output); output.Write("</TD>"); output.Write("</TR>"); output.Write("<TR>"); output.Write("<TD>"); messages.RenderControl(output); output.Write("</TD>"); output.Write("</TR>"); output.Write("</TABLE>"); } private void search_Click(object sender, EventArgs e) { try

2. http://www.w3.org/TR/xhtml-media-types/

{ //Execute Query results = query.Execute(buildQuery()); } catch(Exception x) { messages.Text += x.Message; } } } }

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This makes sense for Yahoo!, because its Webmail client is designed traditionally, and each of the elements is content that is related to the other elements on the HTML page using links For example, the navigation contains a list of emails that you can reference and display in the other window Let s look at a simple example of using the iframe element: <iframe width="200" height="200" src="/ajaxrecipes/dhtml/otherdisplayhtml"></iframe> In the example, the iframe element is declared with an initial height and width, and it is set to download the content at the URL defined by the src attribute The URL of the iframe can be anything, as the iframe will download what is requested.

Request: GET /books/3791330942 HTTP/11 Accept: */* Accept-Language: en-ca Accept-Encoding: gzip, deflate User-Agent: Mozilla/40 (compatible; MSIE 60; Windows NT 51; SV1; NET CLR 2050215; NET CLR 114322) Connection: Keep-Alive Some browsers send the Accept type identifier */*, which essentially means, Send me whatever you ve got; I will accept it Such a request is extremely unhelpful and makes it difficult to implement the separation of the resource from the representation The solution to this problem is to define a default representation for the identifier */* It s not an ideal solution, but a solution created from the necessity to send something A good default is HTML because those clients that send */* are most likely HTML-based web browsers Knowing the preferences of the client, and combining those preferences with the URL, it is possible to send a representation.

The decisions are encapsulated into a component that routes the content The component when called can contain the logic to do one of two things: send the appropriate content, or rewrite the URL that will send the appropriate content The preferred approach is to rewrite the URL to something that will send the appropriate content So, for example, if a web browser is interested in the document /book, the representation is /book/[document]html If an XML-based REST client is interested in the content /book, the E B V N representation is /book/[content]xml The URL rewrite approach is used for the following reasons: Content editors such as Microsoft FrontPage, Macromedia Dreamweaver, or Altova XMLSpy require a specific URL that can be used to edit content Content editors are not able to edit different representations associated with a single URL.

Using the QueryProvider class to execute a query and display results gives you complete control over the searching process, but it also requires you to handle every aspect of displaying, sorting, and grouping the results. This means that you are unable to use the standard sorting and grouping functionality found in the action list on Search.aspx. These actions offer significant functionality that you will have to develop yourself when you use a QueryProvider class. In many cases, what we want is a way to customize how results are displayed, but still utilize the action links shown in Figure 4-3.

If the URL falls under the same origin policy as the parent HTML page, then a script can reference the DOM within the iframe, but if the URL does not fall under same origin policy, then the content will be downloaded by the DOM and cannot be referenced by the script If the script attempts to reference the content, an access-denied exception will occur Figure 3-21 shows the example code in an HTML page..

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