如何在与按钮相同的数据表行中获取输入组件的值? [英] How to get the value of an input component in the same datatable row as the button?

问题描述

我有一个数据表，其中的行是动态的，每行都包含一个selectOneMenu.如果我在每行上都有一个按钮，并且想要在selectOneMenu上获取选定的项目，那么最好的方法是什么?

I have a datatable where the rows are dynamic and each row contain a selectOneMenu. If I have a button on each row and I want to get the selected item on the selectOneMenu, what's the best way to do it?

推荐答案

在 (本例中的Item只是代表每一行的javabean类，例如Person，Product等)

(the Item in this example is just the javabean class representing every row, e.g. Person, Product, etc)

将其绑定到数据表的value.

<h:dataTable value="#{bean.model}" var="item">

如果下拉列表绑定到Item的属性，并且按钮绑定到同一bean的方法...

If the dropdown is bound to a property of Item and the button to a method of the same bean ...

<h:column>
    <h:selectOneMenu value="#{item.value}">
        <f:selectItems value="#{bean.values}" />
    </h:selectOneMenu>
</h:column>
<h:column>
    <h:commandButton value="submit" action="#{bean.submit}" />
</h:column>

...，那么您可以通过

... then you can grab the current item by DataModel#getRowData() and corrspondingly also the selected value in action method as follows:

public void submit() {
    Item item = model.getRowData();
    String value = item.getValue();
    // ...
}

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