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CHAPTER 3 DYNAMIC CONTENT RECIPES
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span: Defines an assignable content block that is nearly identical to a div element, with one exception. A span element is an inline division and places content beside the element. Using a span element, you could define a paragraph of text, and within the text use the span element to identify individually replaceable pieces of text without disrupting the flow of the paragraph. The remainder of this recipe illustrates the different scenarios where you would use a content block. Let s start with the simplest scenario: a data placeholder. When a content block is a data placeholder, its role is to define a chunk that you can reference from a script. From the perspective of the user interface, you don t know that a content block exists. Figure 3-15 illustrates an example of a data placeholder content block.
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Figure 3-15. Example HTML page that contains a data placeholder
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Figure 3-15 features a text box, a button, and some text. Users can replace the current text of the data placeholder by entering some text in the text box and clicking the button. The script then replaces the text in the data placeholder, as illustrated in Figure 3-16.
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Figure 3-16. Text that replaces the data placeholder
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In Figure 3-16, the replaced text is [[REPLACE]]. Notice how it is not obvious where the data placeholder resides. This is the intent of the span element. The code for Figure 3-15 is as follows. Source: /website/ROOT/ajaxrecipes/dhtml/dataplaceholder.html <html> <head> <title>Data Placeholder Example</title> </head> <script language="JavaScript" type="text/javascript"> function Replace() { document.getElementById( "word").innerHTML = document.getElementById( "toreplace").value; } </script> <body> <p> <input type="text" size="20" id="toreplace" />  <input type="button" value="Replace" onclick="Replace()" /> </p> <p>This is a runalong text that contains a <span id="word">word</span> that can be replaced</p> </body> </html>
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CHAPTER 3 DYNAMIC CONTENT RECIPES
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The example code shows a simple wiring of the onclick event to a function that uses the getElementById method to find, extract, and replace text. For illustration purposes, let s replace span with div and see what results. Figure 3-17 is the result of using div and is the same test as shown in Figure 3-16.
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Figure 3-17. Text using the div element that replaces the data placeholder
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The difference between Figures 3-16 and 3-17 is that the replaced text is a lone block with its own area. As indicated earlier, it would mean that a span element is used for inline text, and div is not. While the default case is correct, it is not completely correct. It is possible to make a span element behave like a div element and vice versa. Figure 3-18 shows an example of how you can switch the behavior of the elements. In Figure 3-18, the roles of div and span have been reversed. This is possible because the style attribute s subproperty display controls how the element is placed. The first italic text in Figure 3-18 is a div element with the display subproperty set to inline. The second italic text is a span element with its display subproperty set to block. In the context of a content block, it doesn t matter if you choose a span or div element, since each can be made to look and behave like the other. The following code illustrates how to define the div and span elements: Some text with embedded ( <div style="display:inline"><i>inline div element</i></div>). and more text with embedded ( <span style="display:block"><i>block span element</i></span>). You can also use the span and div elements to display content in an HTML page that can be directly referenced without having to manipulate the referenced elements surrounding HTML. Now suppose you want to create error messages. You should not display error messages before an error occurs, so you should keep the error message hidden. You can use the following HTML code to hide a span element: (<span id="hidden" style="visibility:hidden">empty space</span>)
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