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You can insert JavaScript code for any of the attributes listed in Table 29-1. For example, the following web page adds the onMouseOver attribute to two TextBox controls: protected void Page_Load(object sender, System.EventArgs e) { TextBox1.Attributes.Add("onMouseOver", "alert('Your mouse is hovering on TextBox1.');"); TextBox2.Attributes.Add("onMouseOver", "alert('Your mouse is hovering on TextBox2.');"); } When the user moves the mouse over the appropriate text box, the event occurs and the JavaScript alert() function is called, which shows a message box (as shown in Figure 29-1).

Keep in mind that ASP.NET already uses the onChange event to support the automatic postback feature. If you add the onChange attribute and set the AutoPostBack property to true, ASP.NET is intelligent enough to add both your JavaScript and the __doPostBack() function call to the attribute. Your client-side JavaScript code will be executed first, followed by the __doPostBack() function.

With all the sanity checks completed, we can be certain that the values retrieved are valid for an object that existed on the date passed to the method. Since the first value retrieved in the QuerySet was the , which isn t part of the original model, a slice is taken to retrieve the rest of the values, which are then passed to the model instead.

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Usually, you need to insert JavaScript by adding attributes to a control. However, one exception exists. If you want to handle button clicks with JavaScript code, you can use the OnClientClick property. Here s an example that gets confirmation before a page is posted back: <asp:button id="btnClick" runat="server" OnClientClick="return confirm('Post back to the server ');" text="Click Me"/> The button click still posts back the page and raises server-side events. The difference is that the OnClientClick client-side logic fires first and then the postback is performed.

You can use the OnClientClick attribute to cancel a postback. The basic pattern is to call a JavaScript method. If this method returns false, the postback is canceled.

It s impractical to place a large amount of JavaScript code in an attribute, particularly if you need to use the same code for several controls A more common approach is to place a JavaScript function in a <script> block and then call that function using an event attribute The <script> tag can appear anywhere in the header or the body of an HTML document, and a single document can have any number of <script> tags in it However, everything in the document is processed in the order in which it appears in the file, from top to bottom In other words, if you need to call a function, that function must be defined in a <script> block before the event attribute that calls it The <script> tag takes a language attribute that specifies the language and version.

The tools and techniques discussed in this book go well beyond the official Django documentation, but there s still a lot left unexplored. There are plenty of other innovative ways to use Django and Python; the rest is up to you. As you work your way through your own applications, be sure to consider giving back to the Django community. The framework is available because others decided to distribute it freely; by doing the same, you can help even more people uncover more possibilities. The Appendix explains how you can give back to the community and to the framework itself.

Browsers will ignore <script> blocks for languages or language versions they don t support (although you ll see certain quirks) A typical inline script looks like this: <script language="JavaScript"> <!-windowalert('This windows displayed through JavaScript'); // --> </script> In this case, the HTML comment markers (<!-- and -->) hide the content from browsers that don t understand script Additionally, the closing HTML comment marker (-->) is preceded by a JavaScript comment (//) This is because extremely old versions of Netscape will throw a JavaScript parsing exception when encountering the closing HTML comment marker Modern browsers don t suffer from these problems, and most browsers now recognize the <script> tag (even if they don t support JavaScript) You can also use the src attribute to reference an external file containing JavaScript, as shown here: <script language="JavaScript" src="ExternalJavaScriptjs"> </script> This technique is often used with complex JavaScript routines.

You can also embed a JavaScript resource in a DLL assembly when you build a custom control using the WebResource attribute (discussed in 28)..

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