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Download Advanced JavaServer Pages by David Geary PDF

By David Geary

Hundreds of thousands of builders have stumbled on that JavaServer Pages characterize the optimum resolution for cross-platform web-based improvement. Now that they have mastered the fundamentals of JSP, many are seeking for to deepen and improve their services. In complicated JavaServer Pages, best-selling Java writer and previous JavaSoft developer David Geary grants the subtle enterprise-class suggestions they're trying to find. Geary tackles JavaServer Pages 1.1 with an identical exhaustive, authoritative method that made his picture Java books such a success. He starts with a radical evaluate of JSP components, servlets, and JavaBeans; then introduces customized and physique tags; and provides subtle insights into JSP-based net program layout. complicated JavaServer Pages comprises targeted chapters on internationalization, safety, databases, electronic mail integration, and company JavaBeans. for each Java developer drawn to developing server-side courses with JavaServer Pages and Sun's servlet applied sciences

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Example text

Figure 3-3. Using JavaScript for Client-side Validation The left picture in Figure 3-3 shows the form partially filled in, and the right picture shows the result of submitting a partially filled in form. The JSP page shown in Figure 3-3 is listed in Example 3-3.

Subsequently, doAfterBody returns EVAL_BODY_TAG, forcing a reevaluation of the tag's body content. If there are no more items in the collection, body content is written out, SKIP_BODY is returned, and the iteration terminates. The iterate tag handler does not implement a release method because that class does not contain any information that needs to be reset in order for an iterate tag to be reused. At first glance, it may seem rather curious that the iterate tag writes its body content to something known as the previous out.

That bean is subsequently used to restore the state of the checkboxes and options. a includes another JSP page that displays form values. b. length; ++i) { %> <%= strings[i] %> <% } } %> The JSP page listed above displays the selected categories and years. b. c , the bean listed above provides JavaBeans-compliant accessories for form elements. c deals in arrays because request parameters for checkboxes and options are represented by arrays of strings. 59 Advanced JavaServer Pages Because checkboxes are selected with a "checked" attribute and options are selected with a "selected" attribute, the methods categorySelectionAttr and yearSelectionAttr return "checked" and "selected", respectively, when a checkbox or option is selected.

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