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The RollOverButton class provides two properties one URL for the original image and another URL for the image that should be shown when the user moves the mouse over the button. Here are the property definitions: public string ImageUrl { get {return (string)ViewState["ImageUrl"];} set {ViewState["ImageUrl"] = value;} } public string MouseOverImageUrl { get {return (string)ViewState["MouseOverImageUrl"];} set {ViewState["MouseOverImageUrl"] = value;} } The next step is to have the control emit the client-side JavaScript that can swap between the two pictures. In this case, it s quite likely that there will be multiple RollOverButton instances on the same page. That means you need to register the script block with a control-specific key so that no matter how many buttons you add there s only a single instance of the function. By convention, this script block is registered by overriding the OnPreRender() method, which is called just before the rendering process starts, as shown here: protected override void OnPreRender(EventArgs e) { if (!Page.ClientScript.IsClientScriptBlockRegistered("swapImg")) { string script = "<script language='JavaScript'> " + "function swapImg(id, url) { " + "elm = document.getElementById(id); " + "if(elm) elm.src=url; }" + "</script> "; Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "swapImg", script); } base.OnPreRender (e); } This code explicitly checks whether the script block has been registered using the IsClientScriptBlockRegistered() method. You don t actually need to test this property; as long as you use the same key, ASP.NET will render only a single instance of the script block. However, you can use the IsClientScriptBlockRegistered() and IsStartupScriptRegistered() methods to avoid performing potentially time-consuming work. In this example, it saves the minor overhead of constructing the script block string if you don t need it.

To really streamline your custom control code, put all your JavaScript code into a separate file, embed that file into your compiled control assembly, and then expose it through a URL using the WebResource attribute, as discussed in 28. This is the approach that ASP.NET uses with its validation controls, for example.

Remember that because RollOverButton derives from WebControl and uses <img> as the base tag, it already has the rendering smarts to output an <img> tag. The only parts you need to supply are the attributes, such as name and src. Additionally, you need to handle the onClick event (to post

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Because Django is open source, any user may make changes to Django s code and distribute those modified copies. Many developers have done so, adding significant features and enhancements and providing their work for others to use. Advanced users can make considerable alterations to the central code without impacting those who don t need the features provided by the copy. In addition, developers are allowed and encouraged to make their applications generic and distribute them to others. These sometimes become so ubiquitous that many developers include them by default in any new project they start. In contrast, Django s core is simply the code that is distributed through the main Django Web site, either as an official release or as the main trunk development code. So when a discussion includes a debate about whether something should be in core, the dilemma is whether it should go into the official distribution or in some third-party format, such as a branch or a distributed application.

back the page) and the onMouseOver and onMouseOut events to swap the image. You can do this by overriding the AddAttributesToRender() method, as follows: protected override void AddAttributesToRender(HtmlTextWriter output) { output.AddAttribute("name", ClientID); output.AddAttribute("src", ImageUrl); output.AddAttribute("onClick", Page.ClientScript.GetPostBackEventReference( new PostBackOptions(this))); output.AddAttribute("onMouseOver", "swapImg('" + this.ClientID + "', '" + MouseOverImageUrl + "');"); output.AddAttribute("onMouseOut", "swapImg('" + this.ClientID + "', '" + ImageUrl + "');"); } The last ingredient is to create the RaisePostBackEvent() method, as required by the IPostBackEventHandler interface, and use it to raise a server-side event, as shown here: public void RaisePostBackEvent(string eventArgument) { OnImageClicked(new EventArgs()); } public event EventHandler ImageClicked; protected virtual void OnImageClicked(EventArgs e) { // Check for at least one listener and then raise the event. if (ImageClicked != null) ImageClicked(this, e); } Figure 29-14 shows a page with two rollover buttons.

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