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POJSTL - Dynamic dropdown/dropright menu creation in JSP, extracting data from a list (java.util.List)
 

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  1. POJSTL - Dynamic dropdown/dropright menu creation in JSP, extracting data from a list (java.util.List)
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    <p>MVC pattern: servlets + JSP pages. I have a class <code>Category</code>with (basic) look:</p> <pre><code>public class Category{ private Integer id; private String name; private Category parentCategory; ... //getters and setters } </code></pre> <p>This class should represent category-subcategory concept: one category can have multiple subcategories, category does not need to have a parent (top level category, parentCategory field is null), if it is a subcategory then its parentCategory field represents its parent).</p> <p>In servlet, i extract all categories from database to a java.util.List object. Then i attach this list to application scope(servlet context) and forward it to JSP page.</p> <pre><code>List&lt;Category&gt; categories = categoryDao.findAll(); ServletContext servletContext = getServletContext(); servletContext.setAttribute("categories", categories); </code></pre> <p>Now, in JSP page, i have a navigator menu, you can see it here: <a href="http://jsfiddle.net/vvozar/tMz9A/1/" rel="nofollow">http://jsfiddle.net/vvozar/tMz9A/1/</a> (<code>see menu look in jsfiddle link</code>) Dropdown menus are simple unordered lists in HTML, and its submenus are nested unordered lists under certain menu items. Example (static):</p> <pre><code>&lt;nav&gt; &lt;!-- Navigation --&gt; &lt;ul class="dropdownMenu"&gt; &lt;li&gt;&lt;a href="#"&gt;Home&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Categories&lt;/a&gt; &lt;ul class="droprightMenu"&gt; &lt;li&gt;&lt;a href="#"&gt;All&lt;/a&gt; &lt;ul class="droprightMenu"&gt; &lt;li&gt;&lt;a href="#"&gt;Category 1&lt;/a&gt; &lt;ul class="droprightMenu"&gt; &lt;li&gt;&lt;a href="#"&gt;Category 1.1&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Category 1.2&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Category 1.3&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Category 1.4&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Category 2&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Category 3&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Category 4&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Manage&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Profile&lt;/a&gt; &lt;ul class="droprightMenu"&gt; &lt;li&gt;&lt;a href="#"&gt;Login&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Register&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Edit Profile&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;My Posts&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Logout&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Help&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/nav&gt; </code></pre> <p>I would like to create these menus and submenus (dynamically) by reading categories/subcategories from the list, following category hierarchy.(categories with same parent belong to same dropdown menu).</p> <p>How should JSTL loop for creating categories menu look?</p>
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    1. COAnswered here: http://stackoverflow.com/questions/20689865/jstl-loop-in-jsp-for-nested-unrodered-lists
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