将参数传递给 a4j:ajax 方法
我正在尝试使用
<h:selectOneMenu id="aa" value="#{colorClass.color}">
<f:selectItems value="#{myChoices.colorOptions}"/>
<a4j:ajax event="change" render="colorCode"
execute="#{myChoices.getColorCode(colorClass,colorClass.color)}"/>
</selectOneMenu>
表格上的颜色选择正确；
我的问题是，当我将 colorClass.color 作为执行的一部分传递时，它是空白的； 如果我将 colorClass.color 替换为文字
<a4j:ajax event="change" render="colorCode"
execute="#{myChoices.getColorCode(colorClass,'green')}"/>
，则调用该方法，查找 colorCode 并重新绘制表单
如何“获取”刚刚输入的值，以便可以将其作为参数传递给该方法？
I am trying to use <a4j:ajax> to feed a method with a value just entered on the form;
<h:selectOneMenu id="aa" value="#{colorClass.color}">
<f:selectItems value="#{myChoices.colorOptions}"/>
<a4j:ajax event="change" render="colorCode"
execute="#{myChoices.getColorCode(colorClass,colorClass.color)}"/>
</selectOneMenu>
Color on the form is selected correctly;
my problem is that when I pass colorClass.color as part of the execute, it is blank;
if I replace colorClass.color with a literal
<a4j:ajax event="change" render="colorCode"
execute="#{myChoices.getColorCode(colorClass,'green')}"/>
the method is called, finds the colorCode and repaints the form
How can I "grab" the value just entered so that I can pass it as a parameter to the method?
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您需要
listener属性而不是execute属性。execute属性应指向要提交的客户端 ID 的集合（默认为@this和@form）。但是，在您的特定情况下，它返回void并保持execute为空。listener属性应该指向 bean 操作侦听器方法。相应地修复它：请注意，
colorClass参数在这里似乎是多余的，或者至少是colorClass.color，因为您也可以只执行colorClass.getColor()code> 在getColorCode()方法中。只要通过其中一项就足够了。最好传递colorClass.color，这样您的myChoicesbean 就不会与colorCodebean 紧密耦合。You need
listenerattribute instead ofexecuteattribute. Theexecuteattribute should point to a collection of client IDs which are to be submitted (which defaults to@thisin<f:ajax>and@formin<a4j:ajax>). However in your particular case it returnsvoidand keeps theexecuteempty. Thelistenerattribute is supposed to point to a bean action listener method. Fix it accordingly:Note that the
colorClassargument seems superfluous here, or at least thecolorClass.coloras you could also just docolorClass.getColor()inside thegetColorCode()method. Just passing one of them ought to be sufficient. PassingcolorClass.colorwould be preferable so that yourmyChoicesbean is not tight coupled with thecolorCodebean.