首页 \ 问答 \ 通过ajax显示和隐藏primefaces选项卡(show and hide primefaces tab via ajax)

通过ajax显示和隐藏primefaces选项卡(show and hide primefaces tab via ajax)

我有下面的primefaces选项卡视图的版本。

<p:tabview>
    <p:tab id="1">
        <p:selectOneMneu value="#{bean.answer}>
            <f:selectItem itemValue="yes"/>
            <f:selectItem itemValue="no" />
        </p:selectOneMenu>
    </p:tab>
    <p:tab id="2" rendered=#{bean.answer eq 'yes'} >
        <h:outputText="answer is Yes."/>
    </p:tab>
    <p:tab id="3" rendered=#{bean.answer eq 'no'} >
        <h:outputText="answer is No."/>
    </p:tab>
</p:tabView>

有一个托管bean捕获“yes”或“no”的选定值。 评估值时,取决于答案,其中一个选项卡将被隐藏。 一旦您对所做的选择感到满意,他/她就会点击一个提交按钮来发布数据。

我的问题是如果用户在按提交按钮之前改变了他/她的想法。 返回到下拉菜单(selectOneMenu),然后将值从“是”更改为“否”。 然后,我希望动态的豆将检索更新的答案,而不刷新整个xhtml页面。 这似乎是阿贾克斯的答案,但我不知道如何解决它。


I have following water down version of primefaces tab view.

<p:tabview>
    <p:tab id="1">
        <p:selectOneMneu value="#{bean.answer}>
            <f:selectItem itemValue="yes"/>
            <f:selectItem itemValue="no" />
        </p:selectOneMenu>
    </p:tab>
    <p:tab id="2" rendered=#{bean.answer eq 'yes'} >
        <h:outputText="answer is Yes."/>
    </p:tab>
    <p:tab id="3" rendered=#{bean.answer eq 'no'} >
        <h:outputText="answer is No."/>
    </p:tab>
</p:tabView>

There is a managed bean which captures the selected value of either "yes" or "no". When the value is evaluated, depends on the answer, one of the tabs will be hidden. Once you are satisfied with the choice made, he/she clicks a submit button to post the data.

My question is what if a user changes his/her mind before pressing a submit button. Go back to drop down menu (selectOneMenu) then changes the value from "yes" to "no". Then I am hoping dynamically the bean would retrieve updated answer without refreshing entire xhtml page. It seems like ajax is the answer but I am not sure how to resolve it.


原文:https://stackoverflow.com/questions/41190800
更新时间:2022-03-22 21:03

最满意答案

这在PHP中不是本地可能的。 有些解决方法像使用数组来传递所有参数而不是一行参数, 但是它们有很大的缺点

我能想到的最好的手动解决方法是定义一个常数值,该常数值不能与实际值相冲突。 例如,对于不能为-1的参数:

define("DEFAULT_ARGUMENT", -1);

并为此进行测试:

function($foo = DEFAULT_ARGUMENT, $bar = false){}

This is not natively possible in PHP. There are workarounds like using arrays to pass all parameters instead of a row of arguments, but they have massive downsides.

The best manual workaround that I can think of is defining a constant with an arbitrary value that can't collide with a real value. For example, for a parameter that can never be -1:

define("DEFAULT_ARGUMENT", -1);

and test for that:

function($foo = DEFAULT_ARGUMENT, $bar = false){}

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