Enable/Disable columns in dataTable PrimeFaces

Question

I have created one dataTable in page and shown some columns but I want to show only those columns which have entries ( if any column doesn't have record then it should not be displayed on the page.) . Anyone please tell me how should I put validation on this and display table.

Answer 1

You can use the rendered attribute on the column.

For example if your current code is like in the Primefaces showcase (where the entity is Car) you create a method on the bean for every column you would want to omit if all rows are empty. For example for the column "Color":

public Boolean hasAnyCarColor() {
    for (Car car : cars) {
        if (!(car.getColor() == null) && !(car.getColor().isEmpty()))
            return true;   
    }
    return false;
}

In the view do:

<p:column rendered="#{testBean.hasAnyCarColor()}">
    ....
</p:column>

If there are many rows you would probably want to cache the Boolean's in some attributes on the bean.

Answer 2

I think this code can help you:

<p:column rendered="#{var.login != null}">
 <h:outputText value="#{var.login}" />
</p:column>

the column will be rendered only if the var is not null