Mapping hashMap of Java to javascript object(DWR framework)

[aryan8481]

i needed to use hash map in javascript for my application using DWR. If you know DWR enables you to call java method in your javascript code. In my case the return type of method was hashMap so had map it and iterate it.

This is how I did it.

PersonVO is just a java class which gives me hashMap of Java. I call a method of it 'maptest' using DWR. The maptest method looks like this:

//-------java code-----------
public Map maptest(String id)
{
HashMap key = new HashMap();
key.put("key","vvaf");

return key;
}

In my javascript i make a call to this method using DWR(AJAX framework) engine which returns me a hashMap. The hashMap goes in data object. You can store it in any variable(var) of javascript. Use for ..in loop to find the key's existence in map. The important part is accessing value like you access value from an array object of javascript. Here you specify key instead of index.


//--------javascript code----------
PersonVO.maptest(fn,callback=function(data){
var key = new String("key");
for(key in data)
{
//accessing value from data map
alert(data["key"]);
}
});