Bean属性未更新 [英] Bean properties not being updated

问题描述

我的bean被视域化了.我有一个简单的带有getter和setter的字符串属性. getter可以正常工作(通过初始化属性进行检查)，但是setter不能正常工作.在setter方法中，我正在使用每个传入参数构建一个Stringbuffer.

My bean is viewscoped. I have a simple string property with a getter and setter. The getter works fine(checked by initialising the property), but not the setter. In the setter method I am building a Stringbuffer using each of the incoming parameter.

代码:

public String getParamval() {
    return paramval;
}

public void setParamval(String paramval) {
    logger.info("Incoming value:" + paramval);
    pvals.append(paramval);
    this.paramval = "VAL";
}

那是错的吗?我已经在设置器中进行了测试，以查看是否传递了输入字符串，但显然该方法根本没有被调用/调用.在视图中，我使用#{}表示法.

Is that wrong? I have tested within the setter to see if the input string is being passed but apparently the method is not being called/invoked at all. In the view am using a #{} notation.

查看:

<c:forEach items="${gdsiGeodataBean.requiredfields}" var="reqs">
        <h:outputLabel  value="#{reqs}:* " />  
        <pou:inputText value="#{gdsiGeodataBean.paramval}" required="true" requiredMessage="Input is required."/> 
</c:forEach>

为什么我要在setter方法中构建字符串缓冲区?因为，inputtext是基于动态列表动态创建的.我只有一个要绑定的bean属性.

And why would I wanna build a stringbuffer in a setter method? because, the inputtext are created dynamically based on a dynamic list. I only have one bean property to bind to.

我知道我可以使用地图，但是由于与上述相同的原因，我似乎无法在setter方法中更新地图值.这与我在这里提出的问题有关

I know I could use a map, but for the same reason as above, i seem not able to updated a map values in the setter method. This is connected to the question I asked here Updating a map value in a managed bean

推荐答案

即使方法是完全错误的(提交表单后，getter不会返回正确的值！)，我已经回答了您的关于使用地图的先前问题，在这种特殊情况下，应该真正调用设置器.

Even though the approach is entirely wrong (the getter won't return the right value after you submit the form!) and I have already answered your previous question as to using the map, the setter should really be called in this particular case.

未调用setter的原因可能有多种.最著名的是该表单未放置在<h:form>内，或者您在彼此之间错误地嵌套了多个<h:form>.另一个原因是输入组件或其父项之一具有rendered属性，该属性恰巧在提交请求期间评估false.

That the setter is not called can have several causes. The most famous is that the form isn't been placed inside a <h:form> or that you're incorrectly nesting multiple <h:form>s inside each other. Another cause is that the input component or one of its parents have a rendered attribute which happen to evaluate false during the submit request.

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