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CSS Color and Background Properties
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Here s an example, letterhtml, that styles a business letter s colors and background colors:
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<html> <head> <title> Styling Foregrounds and Backgrounds </title> </head> <body style="background-color: #EEDDDD"> <div align="left"> Chief Web Designer <br> Pretty Pleasing Web Designs, Inc <br> Los Angeles </div> <p> Dear you: <br> <br> <div align="center" style="color: #FF0000; background-color: #55FF55; font-weight: bold; font-size: 16pt"> <br> What do you think of this style <br> <br> </div> <div align="right"> <br> <p> Chief Stylist <br> Dynamo CSS Stylers, Inc <br> London </div> </body> </html>
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7: Working with Cascading Style Sheets with Ajax
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You can also add a button that, when clicked, can change the background of the <div> in the middle of the letter You ve seen that you can refer to elements such as the <body> element like bodystylebackgroundColor but how do you refer to a specific <div> element You can use the getElementById method to get an object corresponding to that <div> element, as we did in the beginning of this chapter, but there s another way as well You can give the <div> element an ID value, and refer to that element in JavaScript simply using that ID value no need to call the getElementById method For example, if you give the <div> element the ID div1, you could refer to its background color like this: div1style backgroundColor Here s how we change the <div> element s background color to white when the user clicks a button:
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<html> <head> <title> Styling Foregrounds and Backgrounds </title> </head> <body style="background-color: #EEDDDD"> <div align="left"> Chief Web Designer <br> Pretty Pleasing Web Designs, Inc <br> Los Angeles </div> <p> Dear you: <br> <br> <div align="center" id="div1" style="color: #FF0000; background-color: #55FF55; font-weight: bold; font-size: 16pt"> <br> What do you think of this style <br> <br> </div> <div align="right"> <br> <p> Chief Stylist
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<br> Dynamo CSS Stylers, Inc <br> London </div> <center> <form> <input type = "button" value = "Change background color" onclick = "div1stylebackgroundColor = '#FFFFFF'"> </form> </center> </body> </html>
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That s useful in Ajax applications when just making the text flash isn t enough you want to make the change you ve made in the web page really stand out by making the background of the element change color (particularly useful when you re dealing with cells in an HTML table) You can see this example at work in Figure 7-5, where clicking the button has changed the color of the central <div> element to white Nice
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Figure 7-5
Setting a <div> element s background
7: Working with Cascading Style Sheets with Ajax
Try This
Use Preassigned Colors
Besides letting you use color values to set colors (like '#FFCCEE'), modern browsers also support dozens of predefined color names like green, red, ivory, sand, viridian, and more Try changing the background of the central <div> element in letterhtml to coral instead of white Here s the code:
<center> <form> <input type = "button" value = "Change background color" onclick = "div1stylebackgroundColor = 'coral'"> </form> </center>
Setting Element Location in Web Pages
A major use in Ajax for CSS is setting absolute positions of the elements in a web page, such as when you create pop-up menus, dialog boxes, drop-down auto-complete list boxes, and so on Table 7-3 lists and describes the CSS properties you use when setting absolute positions
NOTE
By default, the top, bottom, left, and right measurements are taken to be in pixels You can append px to the end of these values to make sure the browser interprets the measurement as pixels, as in 50px
Property
position top bottom left right z-order
Description
Set to absolute for absolute positioning Offset of the top of the element on the screen Offset of the bottom of the element in the browser s client area Offset of the left edge of the element in the browser s client area Offset of the right edge of the element in the browser s client area Sets the stacking order of the item with respect to other elements
Table 7-3
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