Java 如何判断点击了哪个提交按钮

How can I tell which submit button was clicked

提问by crauscher

I have several different submit buttons on my JSP in one form tag that all point to the same servlet. I need to know which submit button was clicked. How can I find out which button was clicked?

我的 JSP 上的一个表单标记中有几个不同的提交按钮，它们都指向同一个 servlet。我需要知道点击了哪个提交按钮。我怎样才能知道点击了哪个按钮？

采纳答案by Maurice Perry

if request.getParameter("button-name") is not null then this is the button that was pressed

如果 request.getParameter("button-name") 不是 null 那么这是被按下的按钮

回答by matt b

Each Submit button should have a different name:

每个提交按钮应该有不同的name：

<input type="submit" value="This is a submit button" name="submit1">
<input type="submit" value="Another submit button" name="submit2">
<input type="submit" value="Yet another submit button!" name="submit3">

Then, the name of the input should appear in the parameters sent to wherever the form is posting to, something like

然后，输入的名称应出现在发送到表单发布到的任何位置的参数中，例如

post.jsp?key=value&submit3=&....

http://www.w3schools.com/tags/tag_input.asp

http://www.w3schools.com/tags/tag_input.asp

回答by Gary Kephart

This is kind of similar to the DispatchAction in Struts. What they do is to have a hidden field, and when you submit the form, have onClick() set the value to specify which action is taken.

这有点类似于 Struts 中的 DispatchAction。他们所做的是有一个隐藏字段，当您提交表单时，让 onClick() 设置值以指定要执行的操作。

<input type="hidden" name="dispatchAction"/>
<input type="submit" value="Edit"   onClick="setDispatchAction('edit')">
<input type="submit" value="Delete" onClick="setDispatchAction('delete')">

回答by The Surrican

<button type="submit" name="somename" value="button1">some text</button>
<button type="submit" name="somename" value="button2">some other text</button>

you will have the post variable "somename" set to the according value, no matter the dispalyed value.

无论显示的值如何，您都会将帖子变量“somename”设置为相应的值。