How to avoid repeatedly click a button in a form?

user_669125 0
Viewed 23255

My code:

<h:form id="newBSTypePanel" >
    <h:panelGrid columns="2" id="newRecod" >
        <h:outputText value="Name"/><h:inputText value="#{treeTableController.newBStypeBean.currentObject.TYPENAME.value}" required="true" />
        <p:commandButton value="save" action="#{treeTableController.saveNewNodes}" oncomplete="Dlg.hide()" update="productDataForm"/>
        <p:commandButton value="close" oncomplete="Dlg.hide()" />
    </h:panelGrid>
</h:form>

There is quite a bit of functionality associated with the save action. If I click the button repeatedly, it may save a few records in the database. That's not my wish. How can I prevent multiple clicks and resolve this?

primefaces jsf
4 Answers

As a generic approach you could customize the button renderer, so you can automatically apply a fix to all (eligible) buttons in your application.

I use this renderer for a PrimeFaces p:commandButton:

public class CommandButtonSingleClickRenderer extends CommandButtonRenderer {

    @Override
    protected void encodeMarkup(FacesContext context, CommandButton button) throws IOException {
        if (isEligible(button)) {
            final String widgetVar = button.resolveWidgetVar(context);
            final String onClick = getAttributeValue(context, button, "onclick");
            final String onComplete = getAttributeValue(context, button, "oncomplete");
            button.setOnclick(prefix(onClick, getToggleJS(widgetVar, false)));
            button.setOncomplete(prefix(onComplete, getToggleJS(widgetVar, true)));
        }
        super.encodeMarkup(context, button);
    }

    protected boolean isEligible(final CommandButton button) {
        final ActionListener[] listeners = button.getActionListeners();
        return button.isAjax()
                    && button.isRendered()
                    && (button.getActionExpression() != null || (listeners != null && listeners.length > 0))
                    && !button.isDisabled()
                    && !isConfirmation(button);
    }

    protected boolean isConfirmation(final CommandButton button) {
        final String styleClass = button.getStyleClass();
        return styleClass != null && styleClass.contains("ui-confirm");
    }

    protected String getToggleJS(final String widgetVar, final boolean enabled) {
        return String.format("var w=PrimeFaces.widgets['%s'];if(w){w.%sable();};", widgetVar, enabled ? "en" : "dis");
    }

    protected String getAttributeValue(final FacesContext context, final CommandButton button, final String attribute) {
        final ValueExpression ve = button.getValueExpression(attribute);
        if (ve != null) {
            return (String) ve.getValue(context.getELContext());
        }
        String key = attribute + "CommandButtonSingleClickRenderer";
        String value = (String) button.getAttributes().get(key);
        if (value == null) {
            value = (String) button.getAttributes().get(attribute);
            button.getAttributes().put(key, value == null ? Constants.EMPTY_STRING : value);
        }
        return value;
    }

    protected String prefix(final String base, final String prefix) {
        return base == null ? prefix : prefix + base;
    }

}

faces-config.xml:

<render-kit>
  <renderer>
    <component-family>org.primefaces.component</component-family>
    <renderer-type>org.primefaces.component.CommandButtonRenderer</renderer-type>
    <renderer-class>com.whatever.CommandButtonSingleClickRenderer</renderer-class>
  </renderer>
</render-kit>

This renderer was added to PrimeFaces Extensions 8.0. If you are using PFE, you can simply add this renderer to your faces-config.xml render-kit section:

<renderer>
  <component-family>org.primefaces.component</component-family>
  <renderer-type>org.primefaces.component.CommandButtonRenderer</renderer-type>
  <renderer-class>org.primefaces.extensions.renderer.CommandButtonSingleClickRenderer</renderer-class>
</renderer>

See https://www.primefaces.org/showcase-ext/sections/renderers/commandButtonSingleClick.jsf

user_8806190
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