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POhow to remove a row <h:datatable> programaticaly
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  1. POhow to remove a row <h:datatable> programaticaly
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    copied!<p>I have a form like the following picture. </p> <p><img src="https://i.stack.imgur.com/4txzw.jpg" alt="enter image description here"></p> <p>In the above picture you can see a green add button. When i click on it, it create a new row in a datatable via send a <code>&lt;f:ajax&gt;</code> to backing bean and render . </p> <p><img src="https://i.stack.imgur.com/JPzJD.jpg" alt="enter image description here"></p> <p>Until now all thing is good. But i Except when i click on a cross button inside of each row, that row removed. but it have a bug. for example when i click on the third row cross button, it remove this row from backing bean but not from my ui.</p> <p>in the following you can see my backing bean and .xhtml file. </p> <pre><code>@ManagedBean(name = "AddPollContorler") @ViewScoped public class AddPollControl { private List&lt;Answer&gt; answers = new ArrayList&lt;Answer&gt;(); @PostConstruct public void init(){ answers.add(new Answer()); answers.add(new Answer()); } public List&lt;Answer&gt; getAnswers() { return answers; } public void setAnswers(List&lt;Answer&gt; answers) { this.answers = answers; } public void addAnswer() { answers.add(new Answer()); } public void removeAnswer() { String index=FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("index"); if (StringUtil.isNumber(index)) answers.remove(Integer.parseInt(index)); } } </code></pre> <p>.xhtml : </p> <pre><code>&lt;div class="panel panel-success rgt"&gt; &lt;div class="panel-heading rgt"&gt; &lt;div style="float: left;"&gt; &lt;h:commandLink styleClass="btn btn-success table-button" action="#{AddPollContorler.addAnswer}"&gt; &lt;h:graphicImage library="img" name="add.png" styleClass=" table-icon" /&gt; &lt;f:ajax execute="answers" render="answers"&gt;&lt;/f:ajax&gt; &lt;/h:commandLink&gt; &lt;/div&gt; &lt;h4&gt;&lt;h:outputText value="#{msg['protected.poll.add.answers']}"/&gt;&lt;/h4&gt; &lt;/div&gt; &lt;div class="form-margin"&gt; &lt;h:dataTable value="#{AddPollContorler.answers}" var="answer" id="answers" style="width:100%;"&gt; &lt;h:column &gt; &lt;div class="input-group poll-answer" style="margin: 5px;"&gt; &lt;span class="input-group-addon no-left-radius"&gt;&lt;h:outputText value="#{CounterControler.index+1}" /&gt;&lt;/span&gt; &lt;h:inputText value="#{answer.text}" styleClass="form-control no-radius"/&gt; &lt;div class="input-group-addon no-right-radius poll-answer-remove" &gt; &lt;h:commandLink action="#{AddPollContorler.removeAnswer}"&gt; &lt;h:graphicImage library="img" name="cross.png" /&gt; &lt;f:param name="index" value="#{CounterControler.last}" /&gt; &lt;f:ajax render="answers answers" /&gt; &lt;/h:commandLink&gt; &lt;/div&gt; &lt;/div&gt; &lt;/h:column&gt; &lt;/h:dataTable&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p><strong>update: 2013/06/12</strong> </p> <pre><code>@ManagedBean(name="CounterControler") public class CounterControl { private int index=0; public int getIndex(){ return index++; } public int getLast(){ return index-1; } } </code></pre>
 

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