如何更新p:selectCheckboxMenu的标签,而不是在primefaces中调用ajax后关闭组件？

Question

当我尝试从辅助bean动态生成标签时,会出现一个问题.问题是每个选择的下拉列表都会消失,但标签会正确更新.这有解决方法吗？

<p:selectCheckboxMenu value="#{formBean.selectedMovies}" label="#{formBean.moviesLabel}"    id="Movies" >
    <f:selectItems value="#{formBean.movies}" ></f:selectItems>
    <p:ajax update="Movies" listener="#{formBean.populateLabel}"></p:ajax>
</p:selectCheckboxMenu>

和

//Backing bean 
public void populateLabel() {
    /* Populating the label with the selected options */
    moviesLabel = new String("");
    if (selectedMovies.size() == 0) {
        moviesLabel = "Select";
    } else {
        for (int i = 0; i < selectedMovies.size(); i++) {
            if (moviesLabel.length() == 0) {
                moviesLabel = selectedMovies.get(i);
            } else {
                moviesLabel = moviesLabel + "," + selectedMovies.get(i);
            }
        }
    }
}

Answer 1

这是怎么回事

添加widgetVar="someVarName"到您的p:selectCheckboxMenu

并p:"ajax通过添加修改您的oncomplete="someVarName.show()"

完整代码:

<p:selectCheckboxMenu widgetVar="someVarName" value="#{usersManagmentPage.selectedMovies}" 
        label="#{usersManagmentPage.moviesLabel}"   id="Movies" >
    <f:selectItems value="#{usersManagmentPage.movies}" ></f:selectItems>
    <p:ajax oncomplete="someVarName.show()" listener="#{usersManagmentPage.populateLabel}" update="Movies" ></p:ajax>
</p:selectCheckboxMenu>

在最新的PrimeFaces中你应该使用oncomplete="PF('someVarName').show()"而不是oncomplete="someVarName.show()"