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POJSF h:selectOneMenu is never set even when using f:ajax
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  1. POJSF h:selectOneMenu is never set even when using f:ajax
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    copied!<p>I want to implement a filtering facility in a JSF web application as follows: The users can add as many filters as they want. They can also delete them. So I am having a dataTable of filters. Each row consists of one h:selectOneMenu which has an ajax “change” event in order to make a second h:selectOneMenu visible in the same row. The options of the second h:selectOneMenu are calculated dynamically according to the selected option of the first. </p> <p>The problem is that the value of second h:selectOneMenu is never set to the back-end object even if I added an ajax event. However the value of the first h:selectOneMenu is set.</p> <p>I have the following fragment of code in an .xhtml page:</p> <pre><code>&lt;h:form id="filterForm"&gt; &lt;h:dataTable id="filterTable" value="#{filterManager.filters}" var="filter"&gt; &lt;h:column&gt; &lt;h:outputLabel value="#{msgs.filterBy}:" for="availableFilters" /&gt; &lt;h:selectOneMenu id="availableFilters" value="#{filter.filter}"&gt; &lt;f:selectItems value="#{filterManager.getProperties(typeSelector.typeSelected)}" /&gt; &lt;f:ajax event="change" render=":filterForm" /&gt; &lt;/h:selectOneMenu&gt; &lt;/h:column&gt; &lt;h:column&gt; &lt;h:panelGroup id="filterValuesPanel" &gt; &lt;h:outputLabel value="#{msgs.value}:" for="filterValues" rendered="#{!filter.filterEmpty}" /&gt; &lt;h:selectOneMenu value="#{filter.value}" id="filterValues" rendered="#{!filter.filterEmpty}" &gt; &lt;f:selectItems value="#{filterManager.getPossibleAnswers(filter)}" /&gt; &lt;f:ajax event="change" render=":filterForm" /&gt; &lt;/h:selectOneMenu&gt; &lt;/h:panelGroup&gt; &lt;/h:column&gt; &lt;h:column&gt; &lt;h:commandButton value="#{msgs.delete}" title="#{msgs.deleteFilter}"&gt; &lt;f:ajax event="click" listener="#{filterManager.removeFilter(filter)}" render=":filterForm" /&gt; &lt;/h:commandButton&gt; &lt;/h:column&gt; &lt;/h:dataTable&gt; &lt;h:commandButton value="#{msgs.addNewFilter}"&gt; &lt;f:ajax event="click" listener="#{filterManager.addNewFilter}" render=":filterForm" /&gt; &lt;/h:commandButton&gt; &lt;/h:form&gt; </code></pre> <p>I have a bean called “FilterManager” which has a ViewScoped. Important parts are shown below:</p> <pre><code>@ManagedBean @ViewScoped public class FilterManager implements Serializable { private List&lt;Filter&gt; filters; // it has a getter private int currentFilterId; public void addNewFilter(AjaxBehaviorEvent event) { this.currentFilterId++; this.filters.add(Filter.getEmptyFilter(this.currentFilterId)); } public void removeFilter(Filter filter) { this.filters.remove(filter); } ... } </code></pre> <p>The Filter class is a normal class (not a bean) and is shown below:</p> <pre><code>public class Filter implements Serializable { private int id; private String filter; private String value; public String getFilter() { return filter; } public void setFilter(String theFilter) { if (theFilter != null &amp;&amp; !theFilter.isEmpty()) this.filter = theFilter; } public String getValue() { return value; } public void setValue(String theValue) { this.value = theValue; } public boolean isFilterEmpty() { return this.filter == null || this.filter.isEmpty(); } ... } </code></pre> <p>Notice that TypeSelector is a SessionScoped bean which has a typeSelected property along with getter and setter.</p> <p>The problem is: filter.filter is set correctly whereas filter.value is never set. I can't find the problem so I need your help please. Apologies for all this code but I needed to provide you with all the necessary details.</p> <p>Thanks in advance!</p>
 

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