Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>The <code>@ViewScoped</code> annotation ties the bean to a specific JSF view which in turn relies on the presence of <code>FacesContext#getViewRoot()</code> and subsequently <code>UIViewRoot#getViewMap()</code>. None of both are available in a "plain vanilla" servlet. There's no means of a JSF view inside a plain servlet request, let alone a JSF context. So, unfortunately, this behavior is "by design".</p> <p>You've basically 2 options:</p> <ol> <li><p>Store the desired shared information in the session scope which is keyed by an unique key which is passed around as HTTP request parameter so that both the JSF managed bean and the servlet can grab it from the session scope.</p> <p>E.g. in JSF backing bean:</p> <pre class="lang-java prettyprint-override"><code>dataId = UUID.randomUUID().toString(); externalContext.getSessionMap().put(dataId, data); </code></pre> <p>In JSF view:</p> <pre class="lang-html prettyprint-override"><code>&lt;h:outputScript&gt;var dataId = "#{bean.dataId}";&lt;/h:outputScript&gt; </code></pre> <p>In JavaScript:</p> <pre class="lang-js prettyprint-override"><code>function loadData() { $.get("servletURL", { dataId: dataId }, function(response) { // ... }); } </code></pre> <p>In servlet:</p> <pre class="lang-java prettyprint-override"><code>String dataId = request.getParameter("dataId"); Data data = (Data) session.getAttribute(dataId); </code></pre> <hr></li> <li><p>Use a true JSF backing bean instead of a plain vanilla servlet. You can definitely use <code>&lt;p:remoteCommand&gt;</code> for that. You can use <code>RequestContext#addCallbackParam()</code> in action(listener) method to "pass" ("print" is technically more correct) a JSON object from Java to JS and finally use <code>oncomplete</code> attribute to process it. Given that you're using OmniFaces, the <a href="http://showcase.omnifaces.org/components/commandScript" rel="nofollow"><code>&lt;o:commandScript&gt;</code></a> and <a href="http://showcase.omnifaces.org/utils/Ajax" rel="nofollow"><code>Ajax#data()</code></a> offers the same functionality. The <code>Ajax#data()</code> has the additional advantage that it automatically converts from Java to JSON so that you don't need to do it yourself.</p> <p>E.g. in JSF view:</p> <pre class="lang-html prettyprint-override"><code>&lt;o:commandScript name="loadData" action="#{bean.loadData}" oncomplete="processData()" /&gt; </code></pre> <p>In JSF backing bean:</p> <pre><code>public void loadData() { Ajax.data(data); } </code></pre> <p>In JavaScript:</p> <pre class="lang-js prettyprint-override"><code>function processData() { var data = OmniFaces.Ajax.data; // ... } </code></pre></li> </ol>
    singulars
    1. This table or related slice is empty.
    1. POContextNotActiveException when OmniFaces ViewScoped bean is injected in servlet
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USBalusC
    1. USBalusC
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POContextNotActiveException when OmniFaces ViewScoped bean is injected in servlet
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThe problem with #2 is that the javascript that sends the request is sent by the datatables plugin. So to set it up I would do something like this how is described here: http://datatables.net/examples/data_sources/server_side.html. So I don't know if I can call a loadData() method. I'd either have to ditch the plugin and rewrite how the table works, or go with #1 as you suggest, which is probably the approach I'll have to take. Thanks for the quick response!
      singulars
      1. PO
      1. USGreg H
    2. COI'm not familiar with that (`<p:dataTable>` with lazy data model is much easier), but couldn't you just give it the function name it needs to invoke?
      singulars
      1. PO
      1. USBalusC
    3. COWhen instantiating the plugin, one of the options is a url passed as a string, which the plugin uses to invoke the ajax request. So I don't think passing a function would work (unless it does work and I've missed that in the documentation). I'll give it a try.
      singulars
      1. PO
      1. USGreg H
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload