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The CSS file is linked to the document here
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<head> <link rel="stylesheet" type="text/css" href="dyn_01css" </head> <body> <div id="div1"> I am in div1 It seems like a nice place </div> <div id="div2"> I am in div2 It's a little fancier here </div> <script type="text/javascript" src="dyn_01js"></script> </body>
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The div element with an id of div1 The div element with an id of div2
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The JavaScript file is called here
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The HTML code is linked to the CSS code via the link tag Thus, the div1 element is going to display as simple black text on a white background and the div2 element is going to have a plain, solid-black border around it As you can see, this page is using ids for each div element so not only can you access those elements ids with the CSS code, you can also access the elements via their ids in the JavaScript code So, you can start out your JavaScript file (called in the preceding HTML code save as dyn_01js) with some code to grab both div elements by their ids by using the documentgetElementById() method:
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var d1 = documentgetElementById("div1"); var d2 = documentgetElementById("div2");
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Now you have variables for both elements
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9: The Document Object
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If you want to alter the styles that were set up in the CSS code via JavaScript, you ll need to make use of the style property that is a part of each element node Then, JavaScript uses the same name as the CSS selector to access that particular property For instance, if you wanted to change the color of the text in the div1 element to green, you would use the following code:
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var d1 = documentgetElementById("div1"); var d2 = documentgetElementById("div2"); d1stylecolor = "#00FF00";
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In the CSS code, the selector color is used to alter the element s foreground color In JavaScript, it is also the name of the property used to alter it after accessing the element s style property What if the CSS selector is not all one single word For example, the background-color selector would not work in JavaScript if you used it the same way as in the CSS code The following code attempts to change the background color to green:
var d1 = documentgetElementById("div1"); var d2 = documentgetElementById("div2"); d1stylebackground-color = "#00FF00";
This wouldn t work, because JavaScript doesn t allow the hyphen (-) character as part of a property name Instead, JavaScript puts both words together and capitalizes the first letter of any additional words after the first word Thus, the CSS selector background-color becomes backgroundColor in JavaScript (also, something like border-right-color would become borderRightColor) The JavaScript code could be rewritten as follows to make the change effective:
var d1 = documentgetElementById("div1"); var d2 = documentgetElementById("div2"); d1stylebackgroundColor = "#00FF00";
This will change the background color of the div1 element to green The only issue now is that this will happen as soon as the script runs, which in this case is probably before the viewer ever notices there was another background color on the div1 element in the first place To make this more useful, you can use this ability to access an element s style and combine it with your knowledge of handling events (covered in 7) to create a script that makes style changes in reaction to user events
Coding a Dynamic Script
Now that you know how to alter an element s style properties, you can alter them in reaction to user events to create dynamic scripts This offers you numerous possibilities to alter just about any style property in reaction to just about any event Here, you will continue with the same CSS, HTML, and JavaScript files you have been using to create a dynamic, event-driven script With the current CSS and HTML code in place, you now can code the JavaScript to create the reactions to the events that will trigger your changes Thus, if you want to alter the background
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