Passing Parameter from javascript to Servlet
hi,
I have 2 list boxes in my Jsp page and values for these list boxes are preloaded . These things are to be carried out using javascript onload() function.
So now i want to pass the selected parameters from both the list boxes to servlet and have to display the corresponding resulting datas in same JSP page. if i submit the form then values selelcted by the user will reset because the form has onload() function. then i thought hidden field will solve my problem. but its giving error like nullpointer exception.
so please tell me how to achive this.
When you right a new Option(...) line in javascript, there are three parameters you can give:
Option("text", "value", selected);
How you make use of this depends on how you move from the servlet back to the JSP.
So for example, if you are doing a response.sendRedirect in the servlet, you will either have to add a parameter back to the url you are re-directing to, or add the value to the session. (I like the session method myself... hides it from the user)
//in servlet
public void doGet(...)... {
String country = request.getParameter("country");
String state = request.getParameter("state");
//... Do Stuff ...
HttpSession session session = request.getSession();
session.setAttribute("country", country);
session.setAttribute("state", state);
String sendTo = response.encodeRedirectURL("theForm.jsp");
response.sendRedirect(sendTo);
//... The JSP might look like this now...
//Get the selected values from the session:
<%
String countrySelected = (String)session.getAttribute("country");
String stateSelected = (String)session.getAttribute("state");
%>
<html>
<head>
<script type="text/javascript">
/* Use this to store the values for states in JavaScript */
var state2DArray;
/* Javascript function to set up values for the states and countries */
function initSelects() {
<%
/* This is JSP scriptlet code to get the country list that we need... */
List countries = (List)application.getAttribute("countryList");
%>
countrySelect = document.form.country;
<%
/* This is JSP scriptlet code to loop through the countries and assign
* values as needed. We will break out of scriptlets to print out
* the javascript needed to assign values to the countrySelect and to
* the state2DArray
int countryCount = countries.size();
%>
state2DArray=new Array(<%=countryCount+1%>);
state2DArray[0] = new Array(1);
state2DArray[0][0]="--Select A State--";
<%
for (int co = 1; co <= countryCount; co++) {
Country country = (Country)countries.get(co-1);
List stateList = country.getStates();
int stateCount = stateList.size();
%>
//Now we add a true/false if the country should be selected...
countrySelect.options[<%=co%>] = new Option("<%=country.getName()%>","<%=country.getId()%>",
<%= (country.getId() == countrySelected)%>);
state2DArray[<%=co%>] = new Array(<%=stateCount+1%>);
state2DArray[<%=co%>][0] = "--Select A State--";
<%
for (int st = 1; st <= stateCount; st++) {
String stateName = (String)stateList.get(st-1);
%>
state2DArray[<%=co%>][<%=st%>] = "<%=stateName%>";
//We are going to call the fillInStates now at the end of initSelects so the initial
//values are passed on to the states...
fillInStates(countrySelect);
<%
%>
function fillInStates(countrySelect) {
selectedCountry = countrySelect.selectedIndex;
stateCount = state2DArray[selectedCountry].length;
stateSelect = document.form.state;
stateSelect.options.length = 0;
for (state = 0; state < stateCount; state++) {
//Again add true/false if it should be selected...
stateSelect.options[state] = new Option(state2DArray[selectedCountry][state], state2DArray[selectedCountry][state],
<%= (stateSelected == state2DArray[selectedCountry][state]) %>);
</script>
</head>
<body onload="initSelects()">
<form name="form" id="form" action="#" method="get">
<select name="country" id="country" onchange="fillInStates(this);">
<option value="">--Select A Country--</option>
</select>
<select name="state" id="state">
<option value="">--Select a State--</option>
</select>
</form>
</body>
</html>
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In Brief,
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