如何避免重复单击表单中的按钮

Question

我的代码：

<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>

保存操作有相当多的功能。如果我反复点击按钮，它可能会在数据库中保存一些记录。这不是我的愿望。如何防止多次单击并解决此问题？

Answer 1

<p:commandButton>的客户端API小部件：

• PrimeFaces.widget.CommandButton

• 方法参数返回类型描述

• disable()-无效禁用按钮

• enable()-无效启用按钮

所以你可以这样使用：

<p:commandButton widgetVar="saveButton"
                 onclick="saveButton.disable()"
                 value="save"
                 action="#{treeTableController.saveNewNodes}" 
                 oncomplete="saveButton.enable();Dlg.hide()"
                 update="productDataForm"/>

Answer 2

对于PrimeFaces的较新版本，解决方案是：

 <p:commandButton widgetVar="saveButton"
                 onclick="PF('saveButton').disable()"
                 value="save"
                 action="#{treeTableController.saveNewNodes}" 
                 oncomplete="PF('saveButton').enable();PF('Dlg').hide()"
                 update="productDataForm"/>

Answer 3

使用Javascript和Timer

<script>
function disableClick(){
   document.getElementById('saveButton').disables = true;
   setTimeout('document.getElementById('saveButton').disables = false', 5000)"
}
</script>

 <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()" onclick="disableClick()" id="saveButton" update="productDataForm"/>
        <p:commandButton value="close" oncomplete="Dlg.hide()" />
    </h:panelGrid>
</h:form>

Answer 4

作为一种通用方法，您可以自定义按钮呈现器，这样您就可以自动对应用程序中的所有（符合条件的）按钮应用修复程序。

我将此渲染器用于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>

此渲染器已添加到PrimeFaces Extensions 8.0中。如果您正在使用PFE，您可以简单地将此渲染器添加到您的faces-config.xml render-kit部分：

<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>

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