How to pass Picklist value form one Visual Force page to another?

Question

I have 2 visual force page that I need to pass value from each other. First visual force page is for opportunity edit page. In this page I have a picklist field called Type . Value of this field are One, Two, Three.

There is another field called car and its type is lookup on the Opportunity edit visual fource page. When someone clicks on this lookup I am redirecting them to visualforce page called Carlookup . On this Carlookup visualforce page I want the value of Type from previous page which has been selected by user.

Let me clarify few things here .

In my org I use openPopup() function and pass paramenters into that like baseURL,Width,Heigh

where Variable baseurl is what I have created for different fileters in that lookup page.

Here is the code for Baseurl

var BaseURL="/apex/Looup?txt=" + txt; 

if(Cond.) 
    {baseurl = baseurl + "&txt2=" document.getElementbyId(page:form:pbs:carvalue).value; 

i have tried adding another condition for type

if(opp.type != null) baseurl = baseurl+"&type=" + document.getElementbyId(page:form:pbs:Type).value; }

but this does not go inside if(opp.type != null) even if it is not null. I have debugged that by looking at the gerated url and it does not have no parameter called type.

Anyone please can help me with this? Any suggestion is greatly appreciated.

Answer 1

it should work in following way

if('{opp.type}'!= null){
     baseurl = baseurl+"&type=" +document.getElementbyId("page:form:pbs:Type").value;
}

Edit:

To address openpoup() function having stopped working, try the following and check console for errors:

if(document.getElementbyId("page:form:pbs:Type").value!= null){ baseurl =
baseurl+"&type=" +document.getElementbyId("page:form:pbs:Type").value; } – 

Answer 2

I think you are not refreshing your JavaScript when opp.Type value is update . So pass this value when you call this Javascript method. Something like

popup('{opp.type}')

Also check you are getting picklist value in your code or you can try something like.

var e = document.getElementById("page:form:pbs:Type");
var strValue = e.options[e.selectedIndex].value;

and then pass this value in Parameter. So your complete Javascript method will look like

function popup(type) {
   var e = document.getElementById("page:form:pbs:Type");
    var strValue = e.options[e.selectedIndex].value;
    if(type != null){
        baseurl = baseurl+"&type=" +strValue ;
   }
}