qr code library java free download Using the HTML Script Tags in Java

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Using the HTML Script Tags
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Script tags are used to tell the browser where some type of scripting language will begin and end in an HTML document In their most basic form, script tags appear just like any other set of HTML tags:
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<script> JavaScript code here </script>
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Tells the browser where script code begins Tells the browser where script code ends
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As you can see, there is the opening <script> tag, the JavaScript code, and then the closing </script> tag When you use just the basic opening and closing tags like this, many browsers will assume that the scripting language to follow will be JavaScript However, some browsers may need to be told which scripting language is being used Besides distinguishing where a script begins and ends for the browser, script tags can also tell the browser which scripting language will be used and define the address for an external JavaScript file These additional functions are achieved through the type and src (source) attributes
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Identifying the Scripting Language
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The scripting language between the opening and closing script tags could be JavaScript, VBScript, or some other language Even though JavaScript is usually set as the default scripting language in browsers, there may be some browsers that do not default to JavaScript
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2: Placing JavaScript in an HTML File
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To be safe, it is a good idea to explicitly identify the language as JavaScript You do this by adding the type attribute with the value of text/javascript to the opening script tag:
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<script type="text/javascript"> JavaScript code here </script>
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Tells the browser the scripting language will be JavaScript
The type attribute in the opening script tag is also required in XHTML in order for the Web page to validate In older versions of HTML, the script tag was not case sensitive However, with XHTML, the script tag must be in lowercase JavaScript is case sensitive in all versions, so you will need to be more careful with it In this book, I will use XHTML 10 Transitional for the HTML code (all tag and attribute names will be in lowercase) For the JavaScript code, I will use the case that is needed for it to function correctly
Calling External Scripts
Script tags are also useful if you wish to call an external JavaScript file in your document An external JavaScript file is a text file that contains nothing but JavaScript code, and it is saved with the js file extension By calling an external file, you can save the time of coding or copying a long script into each page in which the script is needed Instead, you can use a single line on each page that points to the JavaScript file with all of the code You can call external scripts by adding an src (source) attribute to the opening script tag:
<script type="text/javascript" src="yourfilejs"></script>
This example calls a JavaScript file named yourfilejs from any page on which you place the line Be sure there are no spaces or code between the opening and closing script tags, as this may cause the script call to fail If the script is extremely long, using the src attribute to add the script to multiple pages can be much quicker than inserting the entire code on each page Also, the browser will cache the external JavaScript file the first time it is loaded, making subsequent Web pages that use the script render faster Using an external script is also helpful when dealing with page validation and when trying to keep script code separated from markup (HTML) code
Using <noscript></noscript> Tags
One way of providing alternate content for those viewers without JavaScript (or with JavaScript turned off) is to use the noscript tag The <noscript></noscript> tags may be placed anywhere in the HTML document and can contain any content needed for those viewers browsing without JavaScript (such as viewers using mobile browsers like the ones on a Blackberry or iPhone) For example:
<script type="text/javascript"> documentwrite("The color is red"); Displays for those viewers with JavaScript </script> Begins noscript content for those <noscript> viewers without JavaScript The color is red </noscript> Ends noscript content
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