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Drawing QR in Java JSP: The Complete Reference

JSP: The Complete Reference
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The text between the start and end tags (referred to as the body) is what s actually displayed in the list box The closing </option> tag isn t required and is frequently omitted When the form is submitted, the value of the selected item is the value associated with the select element In the previous example, if the user selected the last item in the list, the value returned in the data stream would be this:
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to=SP
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If the multiple attribute is specified on the <select> tag, and the user selects multiple items, the parameter name then appears multiple times in the data stream associated with different values So, if the user had selected not only shipping, but finance and marketing as well, the data stream would look like this:
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to=FI&to=MK&to=SP
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The textarea Element
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Whereas the text and password input fields are single-line only, the textarea element can accept multiple lines This makes the textarea element useful for entering comments or other free-form text, which could be longer than one line Both a height and width can be specified, and scrollbars are added by the browser as necessary The syntax of textarea is as follows, <textarea name= name rows= number cols= number > text </textarea> where I name= name assigns the name by which this field will be known to scripts and the server program I rows= number specifies the number of rows in the visible height of the text area This is not a limit on the number of rows that can actually be in the list box, it s only a limit on how many rows are displayed at a time as the list is scrolled I cols= number specifies the width in characters of the visible width of the text area This is not a limit on the number of columns that can actually be in the list box, only its display width
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User interface programming is inherently complex The amount of code devoted to validating input fields is often greater than what performs the actual function Required fields have to be checked to ensure they are nonempty, and optional fields must have default values assigned All fields may need to be validated against a set of acceptable values or algorithms The validity of some fields may depend on the values of others All this validation can be done by the server program, but the back-and-forth network traffic may make it too expensive in terms of response time For this reason, validation is better done on the client using a scripting language such as JavaScript A wide variety of JavaScript books are available, so I won t go into any detail about how JavaScript works, other than to present a complete example
The Contact Us Form with Validation
Let s add some minimal validation to the Contact Us form example shown in Figure 12-1 You need to do three things
Setting the Trigger
First, you need to force some code to be executed when the form is submitted To do this, set the onsubmit attribute in the form tag:
<form method="post" action="diag/ShowParmsjsp" onsubmit="return validate(this);">
JSP IN ACTION
The string specified in the onsubmit attribute is evaluated before the form is submitted Only if it evaluates to true is the form actually submitted In principle, the validation code could be entered directly as the onsubmit attribute value, but it s simpler to call a function and return its value This also makes adding new code easier as validation requirements change
Adding a Script Block
To incorporate JavaScript statements into the HTML you generate, you must enclose them in <SCRIPT> </SCRIPT> tags To ensure these tags have been loaded and evaluated, placing them in the <HEAD> </HEAD> section of the HTML is best
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