自定义验证器如何知道单击了哪个commandButton [英] How can a custom-validator know which commandButton was clicked

问题描述

我的表单有几个提交"按钮， 而某些字段的验证取决于所按下的字段. 如何在我的自定义验证器中找到答案?

my form has several "submit" buttons, and the validation of some of the fields depends on which was pressed. How can I find that out in my custom validator?

推荐答案

按钮的客户端ID也作为<input type="submit">的name生成.按下的<input type="submit">的name=value也作为请求参数发送.因此，您只需在请求参数映射中进行检查即可.

The button's client ID get also generated as name of the <input type="submit">. The name=value of the pressed <input type="submit"> get also sent as request parameters. So you could just check for that in the request parameter map.

例如

<h:form id="formId">
    ...
    <h:commandButton id="button1" ... />
    <h:commandButton id="button2" ... />
</h:form>

，在validate()实现中具有以下内容:

with the following in validate() implementation:

Map<String, String> params = context.getExternalContext().getRequestParameterMap();

if (params.containsKey("formId:button1")) {
    // Button 1 is pressed.
}
else if (params.containsKey("formId:button2")) {
    // Button 2 is pressed.
}

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