Not receiving values in request.getParameterValues.

rahul8 · 03-13-2011, 11:42 AM

I tired of solving this problem but believe I'm missing something.

I'm not receiving values from request.getParameterValues of "mmsTitleAdded"

Here is the process I'm using:

This <tr> contains the MMSCategory list and onChange a javascript function is called which gets the the list of all the mmsTitles of that category:

Code for <tr> of MMSCategory & mmsTitles:

Code:

<tr class=blackbold>
	<td class=TextFont>MMS Category</td>
	<td class=TextFont>
		<select name="MMSCategory" id="MMSCategory" style="width:148" onchange="javascript:fetchCannedMessaged(this.value);">
			<%
				%>
					<option value="Select MMS Category">Select MMS Category</option>
				<%
				for(int i=0;i<mms_category.size();i++){
					%>
						<option value="<%=mms_id.get(i) %>"><%=mms_category.get(i) %></option>							
					<%
				}
			%>
		</select>
	</td>
</tr>
<tr class=blackbold>
	<td class=TextFont>MMS Title</td>
	<td class=TextFont>
	<div id="render">
		<select multiple="multiple" size=5 name="mmsTitle" id="mmsTitle" style="width:148" onchange="javascript:alert();">
			<option value="Select MMS Title">Select MMS Title</option>
		</select>
	</div>
	</td>
</tr>

This is JavaScript/AJAX function is called on onChange of a select list and gets the list of mmsTitles for the selected category.

Code:

function fetchCannedMessaged(val){
	if(val == 'Select MMS Category'){
		return;
	}else{
		document.getElementById('selected_MMSCategory').value = val;
		alert("document.getElementById('selected_MMSCategory').value "+document.getElementById('selected_MMSCategory').value );
		var xhttp;
		if (window.XMLHttpRequest){
			xhttp=new XMLHttpRequest();
		}
		else{
			xhttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
		xhttp.onreadystatechange = function(){
			if((xhttp.readyState == 4) && (xhttp.status == 200)){
				var resp = xhttp.responseText;
				alert(resp);
				document.getElementById('render').innerHTML=resp;
				
				
			}else{
			}
		}
		var url = "Process_CannedMessages.jsp?mms_id="+val;
		xhttp.open("POST",url,false);
		xhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
		xhttp.send(null);
	}
}

Here is the relevant code of Process_CannedMessages.jsp which is called above in the AJAX function:

Code:

<%
Connection connlocal = null;
connlocal = DBUtils.getConnection("default");
System.out.println("->getPARAMETER: "+request.getParameter("mms_id"));
String mms_id = request.getParameter("mms_id");
String query = "select canned_id,title from proxy_canned_details where mms_categoryid='"+mms_id+"' ORDER BY canned_id DESC;";
Vector results = null;
String render ="";
render =	"<table> <tr> <td> <select multiple='multiple' size=8 name='mmsTitle' id='mmsTitle' style='width:148' onchange=''>";
results = DBUtils.getVectorResult(connlocal,query);
String[]arr = new String[results.size()];
for(int i=0;i<results.size();i++){
	arr = (String[])results.get(i);
	render	=	render + "<option value='"+arr[0]+"'>"+arr[1]+"</option>";
}

render = render + "</select></td>";

render = render +"<td align ='top'><input type='button' value='<<' onClick='javascript:moveOptions(this.form.mmsTitleAdded,this.form.mmsTitle);'/>"
				+"<input type='button' value='>>' onClick='javascript:moveOptions(this.form.mmsTitle, this.form.mmsTitleAdded);'/><NOBR></td>"
				+"<td><select multiple='multiple' size=8 name='mmsTitleAdded' id='mmsTitleAdded' style='width:148'>"
				+"</select></td> </tr> </table>";

String resp = ""+arr[0]+","+arr[1]+"";
	System.out.println("resp:"+resp);
	out.println(render);
%>

And Finally, (thank you for bearing this far)
I am submitting the form in which <tr> are defined (First Code above) whose action"Submit_package_details.jsp"
Here is the Code for Submit_package_details.jsp:

Code:

String pack_name 		= request.getParameter("selected_pack_name");
String mmsCategory		= request.getParameter("selected_MMSCategory");
String scheduled_date 	= request.getParameter("scheduled_date");
String[]mmsTitleAdded 	= request.getParameterValues("mmsTitleAdded");   // PROBLEM AREA: NOT GETTING VALUE HERE

System.out.println(pack_name);			// GETTING VALUE
System.out.println(mmsCategory);		// GETTING VALUE
System.out.println(scheduled_date);		// GETTING VALUE


	for(int i=0;i<mmsTitleAdded.length;i++){
		System.out.print(mmsTitleAdded[i]+" ");		//NOT GETTING VALUE 
	}

NOT GETTING VALUES IN ABOVE CODE IN

String[]mmsTitleAdded = request.getParameterValues("mmsTitleAdded");

SINCERE THANK YOU FOR READING THIS FAR.

servlet · 03-14-2011, 10:40 AM

I can't find a form with action Submit_package_details.jsp, where's it ?
Again, honestly, this code is horrible, follow certain best practices, No scriptlet's if possible, otherwise keep it minimum, No database calls from JSP, instead of using bare XMLHttpRequest you are better at using some library like jquery.

I just can't find the relevant code from what you have posted, otherwise getting the paramterer values is straight forward, Look at this Servlet request article. Try firebug to see if the form is submitted properly.