Working with multiple buttons on a jsp form....!
Hi guys...!
I have a jsp form, which has 3 buttons (submit, update, cancel), and I also have a java Servlet that processes that form.
In my java Servlet, i have a method called submitData(). I also want to have a method called updateData(), which will be called when the user clicks on the update button.
These are the codes in my jsp form:
<SCRIPT language="JavaScript" type="text/javascript">
function submitFunction (i) {
if (i==1) {
document.theForm.action="/MyWebApp/FormServlet";
if (i==2) {
document.theForm.action="/MyBugWebApp/FormServlet";
if (i==3) {
document.theForm.action="/MyWebApp/DisplayForm.jsp";
document.theForm.submit()
</SCRIPT>
<form name="theForm">
<input type="button" value="Submit" onClick="submitFunction(1)"></input>
<input type="reset" value="Reset"></input>
<input type="button" value="Cancel" onClick="submitFunction(3)"></input>
<input type="button" value="Update" onClick="sumbitFunction(2)"></input>
</form>
As u can see, both the submit and the update button use the same java servlet file. But inside that java servlet file, I want to have methods that will be called inside my doPost() method when the user clicks on update or submit.
I've tried to pass a value through the httpRequest but it doesn't work... This is what I did.
In my javaScript, I added this value in the action attribute:
document.theForm.action="/MyWebApp/FormServlet?id=submit";
document.theForm.action="/MyWebApp/FormServlet?id=update";
I did that because I wanted to be able to retrieve the value of the "id" in my servlet and check which type of action was sent and then call the appropriate function in my servlet.
But, it doesn't work. It returns "null" as the value for "id"
Does anyone know how to do this task??...or what am I doing wrong in my code???
Thanks...
So there are really two solutions to this:
1) Use <input type="submit" instead of buttons. Give all three buttons the same name but different values. Then the button used to submit will be added to the list of parameters.
2) Add a hidden input to the form, and when the form determines which button was pushed, set a different value for the hidden input field. For example of both, take a look at this code:
<html>
<head>
<script type="text/javascript">
function formSubmit(i)
var toSubmit = document.getElementById("myForm")
if (i == 1) toSubmit.doThis.value="one"
if (i == 2) toSubmit.doThis.value="two"
if (i == 3) toSubmit.doThis.value="three"
toSubmit.submit()
</script>
</head>
<body>
<form id="myForm" action="" method="get">
<input type="hidden" name="doThis" /><br />
<input type="submit" name="whatToDo" onclick="formSubmit(1)" value="Submit" />
<input type="submit" name="whatToDo" onclick="formSubmit(2)" value="Cancel" />
<input type="submit" name="whatToDo" onclick="formSubmit(3)" value="Update" />
</form>
</body>
</html>For method one, if the servlet did:
String whatToDo = request.getParameter("whatToDo");
if ("Submit".equals(whatToDo)) {
//doSubmit();
} else if ("Update".equals(whatToDo)) {
//doUpdate();
} else if ("Cancel".equals(whatToDo)) {
//doCancel();
} else if ("Reset".equals(whatToDo)) {
/doReset();
} else {
//error situation
}Or you could instead look at the hidden value:
String doThis = request.getParameter("doThis");
if ("1".equals(doThis)) { ... }I personally like the submit button with the same names and different values, since the second method breaks if the user has javascript disabled.
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Multiple submit buttons in a jsp form?
I've been doing some research and found out that multiple buttons in a JSP form are possible by two ways:
- We can obtain the value of the submit button to know which one was clicked in the parameters of the request using the name of the buttons (which should be the same for all the submit buttons).
- We can change the submit destination using Javascript (Horrible solution since I want my web site to be safe to be used even if Javascript isn't active in clients browsers. I will use it of course since we can do amazing things with it but I want my website to be able to work without it also)
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