How can I tell which submit button was clicked

Question

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?

Answer 1

如果request.getParameter（“button-name”）不为null，那么这是按下的按钮

Answer 2

Each Submit button should have a different 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

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

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

Answer 3

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.

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

Answer 4

<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.