CODEWITHSUNDEEP
javajsf
Charaf JRA
Charaf JRA

Reputation: 8334

Dynamic h:inputtext to backing Bean Array in jsf [ClassCastException]

I'm using JSF 2.0 I have a problem to set Values of inputTexts to a table of double.

I can do this :

<h:inputText value="#{myBean.table[0]}" />

But, I would like to do it in a loop like that:

<c:forEach var="i" begin="0" end="#{myBean.inputsNumber}">              
    <h:inputText  value="#{myBean.table[i]}" />     <br/>            
</c:forEach>   
<h:commandButton action="#{myBean.calculate}" value="Calculate" /> 
Result: #{myBean.result}

Here is my backing bean : 

@ManagedBean
@SessionScoped
public class MyBean {

    private double[] table;
    private double result;

    public MyBean() {
        table = new double[100];
    }

    public void calculate() {
        for (int i = 0; i < table.length; i++) {
            result += table[i];
        }
    }

    public double[] getTable() {
        return table;
    }

    public int getInputsNumber() {
        return table.length;
    }

    public double getResult() {
        return result;
    }

}

I tried to bind all components to an array of HtmlInputText, but I could not solve it. i got this exception : ClassCastException

Upvotes: 1

Views: 2906

Answers (1)

BalusC
BalusC

Reputation: 1108722

There are 2 problems:

  1. The <c:forEach end> is inclusive. You need to take 1 off from it, otherwise you end up with ArrayIndexOutOfBoundsException when submitting.

    <c:forEach var="i" begin="0" end="#{myBean.inputsNumber - 1}">

    A better approach is however to just iterate over the array itself and get the index by varStatus.

    <c:forEach items="#{myBean.table}" varStatus="loop">
    <h:inputText value="#{myBean.table[loop.index]}" />
</c:forEach>

  2. A double in EL is treated as Double, not as double. So you need Double[] instead of double[], otherwise you end up with ClassCastException when submitting.

    private Double[] table;

Upvotes: 3

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