Databases
StackOverflow2013
Postsdbo
POAccessing dynamic UIComponents in JSF Managed Bean
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAccessing dynamic UIComponents in JSF Managed Bean
    primarykey
    data
    text
    <p>I have a JSF page in which I am iterating a list within <code>&lt;h:dataTable&gt;</code> to display some rows containing checkbox, some text and a textbox.</p> <p>I have to validate the <code>&lt;h:dataTable&gt;</code> so that when a user checks the checkbox, he has to enter some text inside the textbox.</p> <p>This is my JSF page.</p> <pre><code> &lt;h:form prependId="false" id="form"&gt; &lt;h:dataTable id="rm" width="100%" cellspacing="4" value="#{controller.alertTriggers}" var="alt" columnClasses="c1,c2,c3,c4"&gt; &lt;h:column&gt; &lt;h:selectBooleanCheckbox value="#{alt.checkValue}" id="checkbox"/&gt; &lt;/h:column&gt; &lt;h:column&gt; &lt;h:outputText value="#{alt.id}" /&gt; &lt;/h:column&gt; &lt;h:column&gt; &lt;h:outputFormat value="#{alt.msg1}" /&gt; &lt;/h:column&gt; &lt;h:column&gt; &lt;h:message for="emailID" id="email" styleClass="validation-error"/&gt; &lt;h:inputText value="#{alt.mailId}" id="emailID" style="width: 87%;" /&gt; &lt;/h:column&gt; &lt;/h:dataTable&gt; &lt;/h:form&gt; </code></pre> <p>I have given the id of all the checkboxes as <code>checkbox</code> and id of all textboxes as <code>emailID</code>. When the page is rendered, on checking the page source, I found that the ids of the checkboxes are 'rm:0:checkbox','rm:1:checkbox'... and those of the textboxes are 'rm:0:emailID','rm:1:emailID'..</p> <p>In the controller, I want to access these dynamic text boxes and check boxes for which I use the following code:</p> <pre><code> FacesContext context = FacesContext. getCurrentInstance(); for (int i=0;i&lt;9;i++){ UIInput u=(UIInput) FacesContext.getCurrentInstance().getViewRoot().findComponent( "form:rm:" +i+":checkbox" ); if ((Boolean) u.getValue()){ UIInput ui=(UIInput) FacesContext.getCurrentInstance().getViewRoot().findComponent( "form:rm:" +i+":emailID" ); //code } } </code></pre> <p>But this is giving java.lang.NullPointerException</p> <p>Even using the code:</p> <pre><code> UIInput u=(UIInput) FacesContext.getCurrentInstance().getViewRoot(). findComponent( "form:rm:0:checkbox" ); gives the same exception. </code></pre> <p>But if I use</p> <pre><code> UIInput u=(UIInput) FacesContext.getCurrentInstance().getViewRoot(). findComponent( "form:rm:checkbox" ); </code></pre> <p>it doesn't give a Null Pointer Exception but I don't know whether which checkbox's value is it giving.</p> <p>So, in summary,</p> <p><strong>JSF generates the ids as rm:1:checkbox,rm:2:checkbox etc., but when I try to access this UI component in JSF page, I am not able to do it.</strong> </p> <p>Am I missing something ? </p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USBalusC
    1. USJini Samuel
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POAccessing dynamic UIComponents in JSF Managed Bean
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POAccessing dynamic UIComponents in JSF Managed Bean
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POAccessing dynamic UIComponents in JSF Managed Bean
      1. USJini Samuel
      1. VTFavorite
    1. This table or related slice is empty.
 

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