How servlet can discover that button was pressed in jsp page?

Question

I have jsp page with many buttons. When I pressed some button it handle in servlet, but how I can identify that button was pressed? I do that:

private String getPressedBtn(HttpServletRequest request){
    Enumeration<String> parameterNames = request.getParameterNames();
    String pressBtn = "";
    if(parameterNames.hasMoreElements()){
        pressBtn = parameterNames.nextElement();
    }
    return pressBtn;
}

But I think that it's very bad way. Wich way is properly?

Why don't you just submit a form to that `Servlet` when the button is pressed? — brso05, Jan 18 '16 at 14:36
You know the button was clicked because you submit the form to that `Servlet` only when it is clicked... — brso05, Jan 18 '16 at 14:45
Or use a hidden input to pass a value that says whether the button was clicked or not. — brso05, Jan 18 '16 at 14:47
Your way is "good enough", since you've localized the `value` of the buttons and can't use the same `name` for them all. It's not the prettiest way, but it's not a "very bad way". — Kayaman, Jan 18 '16 at 14:49

score 0 · Answer 1 · answered Jan 18 '16 at 14:36

0

If you want to get pressed button in servlet, there is better way to do it: At first, use input tag for buttons, define common name attribute for buttons and specific value for each button.

Example:

<input type="button" name="button" value="button1" />
<input type="button" name="button" value="button2" />
...

Then in servlet you can get it by this way:

private String getPressedBtn(HttpServletRequest request){
    return request.getParameter("button");
}

answered Jan 18 '16 at 14:36

eg04lt3r

2,467
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but value in button localized.. – dzrkot Jan 18 '16 at 14:38
What does it means "localized"? – eg04lt3r Jan 18 '16 at 14:40
" class="register" /> – dzrkot Jan 18 '16 at 14:42
So, do you expect that you will receive not localized button value? – eg04lt3r Jan 18 '16 at 14:55

score 0 · Answer 2 · answered Jan 18 '16 at 14:44

0

In each button, you put a link inside, all link have the same request address, but differrent button name in parameters.

answered Jan 18 '16 at 14:44

Mai Hữu Lợi

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u wont say that I must use href? I do that in differ case...In that case I msut use button.. – dzrkot Jan 18 '16 at 14:53
Use onClick="location.href='link'" in the button – Mai Hữu Lợi Jan 18 '16 at 15:00

How servlet can discover that button was pressed in jsp page?

2 Answers2