more than one submit button to change differnently
[nobr]i have two buttons on one form, one needs to read save the changes and change page
the other needs to refresh the page and increment a varable
i looked at creating two forms, but the data required for the second button is within the scope of the first button, is there a way to assign the jstl varable to another form from within another?
the var i need to increment
<c:set var="rows" value="1" />
the two buttons
<INPUT TYPE=SUBMIT VALUE="+">
<br> </br>
<INPUT TYPE=SUBMIT VALUE="Save">
[/nobr]
[693 byte] By [
h1400046a] at [2007-11-26 15:25:34]
# 1
Why not one form with two buttons that post to a servlet that then processes based on the button clicked.
# 2
thanks... ok how do i go about creating a servlet?
# 3
try this example:
<%@ page contentType="text/html;charset=windows-1252"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>untitled</title>
<script language="javascript">
function submitForm(process){
if(process=="add"){
var val = document.myForm.hiddenField.value;
document.myForm.hiddenField.value = parseFloat(val)+1;
document.myForm.submit();
}else{
document.myForm.action="save.jsp";
document.myForm.submit();
}
}
function setHidden(){
document.myForm.hiddenField.value='<%=request.getParameter("hiddenField")!=null?request.getParameter("hiddenField"):"0"%>';
document.myForm.textField.value=document.myForm.hiddenField.value;
}
</script>
</head>
<body onload="setHidden()">
<form name="myForm">
<input type="text" name="textField"/>
<input type="hidden" name="hiddenField" value="0" />
<input type="button" value="+" onclick="submitForm('add')"/>
<input type="button" value="Save" onclick="submitForm('save')" />
</form>
</body>
</html>
# 4
that works but how do you place the value of the hidden field
<input type="text" name="hiddenField" value="0" />
into
<c:set var="rows" value=" " />
# 5
alternativly is it possible to set the jstl varable from the javascript code?im really stuck on this.. any help be great!
# 6
><input type="text" name="hiddenField" value="0" />
The value from this hidden field will be accessible via a request parameter:
In a servlet you can get it with request.getParameter("hiddenField")
with EL, ${param.hiddenField.
Your <c:set> tag then becomes:
<c:set var="rows" value="${param.hiddenField"/>
>alternativly is it possible to set the jstl varable from the javascript code?
No, you cannot affect JSP/JSTL from javascript code.
- JSP/Java runs on the server.
- It generates an HTML page that gets sent to the client.
- Java stops running
- javascript runs on the client (button click events etc)
The only way to run java again is to submit a request either by
- clicking a link
- submitting a form
- using AJAX
# 7
thanks
but i have now realised i have a error on the page when it loads caused by the set hidden function
the error is
document.myForm.textField is null or not an object
? any ideas?
function setHidden(){
document.myForm.hiddenField.value='<%=request.getParameter("hiddenField")!=null?request.getParameter("hiddenField"):"0"%>';
document.myForm.textField.value=document.myForm.hiddenField.value;
}
</script>
<body onload="setHidden()">
<FORM name="myForm" METHOD=POST ACTION="workexp.jsp">
<input type="text" name="hiddenField" value="0" />
# 8
>document.myForm.textField is null or not an objectDo you have an input component on your form with the name "textField" ? I can see "hiddenField", but not "textField".<input type="text" name="textField" value="0" />
# 9
good point in the javascript it should read hiddenFieldthanks alot for your help i have to working now :)
# 10
thnx to evnafets for the explanation..
