Where do you need to use javascript MV* framework

I like following while I was reading an article on javascript frameworks: I thought it is worth repeating:

So, where will you likely need an MV* framework and where won’t you?

If you’re writing an application that will likely only be communicating with an API or back-end data service, where much of the heavy lifting for viewing or manipulating that data will be occurring in the browser, you may find a JavaScript MV* framework useful.

Good examples of applications that fall into this category are GMail and Google Docs. These applications typically download a single payload containing all the scripts, stylesheets and markup users need for common tasks and then perform a lot of additional behavior in the background. It’s trivial to switch between reading an email or document to writing one and you don’t need to ask the application to render the whole page again at all.

If, however, you’re building an application that still relies on the server for most of the heavy-lifting of Views/pages and you’re just using a little JavaScript or jQuery to make things a little more interactive, an MV framework may be overkill. There certainly are complex Web applications where the partial rendering of views can* be coupled with a single-page application effectively, but for everything else, you may find yourself better sticking to a simpler setup.

How to make call using Ajax/ JQuery

First thing you got to include Jquery library
Second thing:
create some functions inside jqueries ready function like this:
$(document).ready(
function()
{
// if you want to take any action on load
});
Third:
There are few ways to do this call and here are 3 ways of them:

1) This is a get call
$("#DivToDisplayResult).load('pageToBeCalled.cfm',{
Param1: param1value,
Param2: param2value,
Param2: param2value,
Param2: param2value,
……..
},
// following function is required, which is being called after we get the result back
function(responseText, textStatus, XMLHttpRequest){
//alert(responseText);
}
2) $.getJSON('pageToBeCalled.cfm',{UserProfileCode: userProfCode}, function(j){
// here you can put the action and you would get result in “j” variable
// like
$("#divName").html(j);
});
3) Post
$.post(
pageToBeCalled.cfm,
{
Param1: param1value,
Param2: param2value,
Param2: param2value, },
function(j) {
//here you can take action by reading “j” variable
}
);