how to get the value of name field of submit button which i can view on page source?

Question

I have created one HTML form which consists of multiple buttons of "edit" and "delete". I put them in a for loop in order to view many of them on another page.

How can I get the name field of the submit button, or whichever button I have clicked, on the next JSP page? Or, can you can provide me an alternative for this?

<% for (int t = 1; t < 10; t++) { %>
    <label>
        <input type="submit" name="<%=t %>" value="edit" onclick="this.form.action='df1.jsp?flag=1&act=1';this.form.submit();" />
        <input type="submit" name="<%=t %>" value="delete" onclick="this.form.action='df1.jsp?flag=1&act=1';this.form.submit();" />
    </label>
<% } %>

When I view the page source, it's showing the name="1" for edit and name="1" for delete till 10.

I want to get the value of name field on server side. I also can't apply request.getParameter(), because I am not aware which button will user hit.

score 0 · Answer 1 · answered Jan 05 '13 at 09:47

0

Use a hidden tag, which stores the value of the clicked button

<input type="hidden" name="hidBt" />

Place this hidden tag outside the value.

<label>
    <input type="submit" name="<%=t %>" value="edit" onclick="this.form.hidBt.value=this.value;this.form.action='df1.jsp?flag=1&act=1';this.form.submit();" />
    <input type="submit" name="<%=t %>" value="delete" onclick="this.form.hidBt.value=this.value;this.form.action='df1.jsp?flag=1&act=1';this.form.submit();" />
</label>

After that call the hidden variable

String butValue = request.getParameter("hidBt");

answered Jan 05 '13 at 09:47

Siva Charan

17,940
9
60
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this hidden tag is displaying the name of button i.e edit or delete – user1950705 Jan 05 '13 at 10:24
@user1950705: Yes, thats what you are looking for. The submit button values are **edit** and **delete**. – Siva Charan Jan 05 '13 at 10:35
i m not looking for edit or delete.........i want to get the value of name field i.e "1" for edit and "1" for delete – user1950705 Jan 05 '13 at 11:48
i am looking for the name value i e"1" for edit and "1" delete......which in can see on page src – user1950705 Jan 05 '13 at 11:55

score 0 · Answer 2 · edited May 23 '17 at 12:27

As you're already changing the form action URL in the onclick (which is a very poor practice, but that aside), why not just adding the row identifier along as well?

<input type="submit" name="<%=t %>" value="edit" onclick="this.form.action='df1.jsp?flag=1&act=1&edit=<%=t%>';this.form.submit();" />
<input type="submit" name="<%=t %>" value="delete" onclick="this.form.action='df1.jsp?flag=1&act=1&delete=<%=t%>';this.form.submit();" />

This way you can just do:

String edit = request.getParameter("edit");

if (edit != null) {
    // Edit button of row "edit" was invoked. Do your job here.
}

String delete = request.getParameter("delete");

if (delete != null) {
    // Delete button of row "delete" was invoked. Do your job here.
}

Otherwise you'd need to prefix the button name with some fixed identifier:

<input type="submit" name="edit_<%=t %>" value="edit" onclick="this.form.action='df1.jsp?flag=1&act=1';this.form.submit();" />
<input type="submit" name="delete_<%=t %>" value="delete" onclick="this.form.action='df1.jsp?flag=1&act=1';this.form.submit();" />

So that you can just do:

for (int t = 1; t < 10; t++) {
    if (request.getParameter("edit_" + t) != null) {
        // Edit button on index "t" was invoked. Do your job here.
        break;
    }

    if (request.getParameter("delete_" + t) != null) {
        // Delete button on index "t" was invoked. Do your job here.
        break;
    }
}

Unrelated to the concrete problem, writing JSPs this way with scriptlets <% %> is since a decade considered oldschool and a poor practice. See also How to avoid Java code in JSP files?

score 0 · Answer 3 · edited May 23 '17 at 12:12

There are a couple of approaches you could take to this.

Look at all the submitted fields

Get all the fields that were submitted (as per this question)
Loop over them
Pattern match their names until you find one that matches the naming convention you have for your submit buttons

Look for all possible submit button names

Generate a list of all the submit button names you could have
Loop over that list attempting to get a parameter with each name until you find one

Given your names are numeric, the number of possibilities is possibly not finite. So the first approach is probably better.

score -1 · Answer 4 · answered Jan 05 '13 at 09:34

-1

you can get button using 

String buttonName =  request.getParameter("button-name")

Then you have to pass the value as hidden value to next page;

answered Jan 05 '13 at 09:34

Mohammod Hossain

4,134
2
26
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wanna to get submit button value – Mohammod Hossain Jan 05 '13 at 09:48
i am looking for the name value i e"1" for edit and "1" delete......which in can see on page src – user1950705 Jan 05 '13 at 11:57

how to get the value of name field of submit button which i can view on page source?

4 Answers4

Look at all the submitted fields

Look for all possible submit button names