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Send JSON Data With Page Response

  • 11-07-2014 4:56pm
    #1
    SimonTemplar
    Registered Users, Registered Users 2 Posts: 2,815 ✭✭✭


    This might be an obvious question but here goes.

    I know how to implement a standard page request-response using Java (standard servlets or with Spring). I also know how to retrieve data from the server using AJAX, JSON and Javascript.

    For example, I know how to do this:

    - User requests a page
    - User selects an item from a dropdown list
    - A DIV is updated using AJAX with information from the server based on the item selected

    However, I’m unsure how to store data in JSON / JS with the actual page response. For example:

    - User requests a page
    - User selects an item from a dropdown list
    - A DIV is updated using data already contained within an existing JSON structure that was sent with the initial page response. An additional server request is not made.


    Firstly, I don’t even know if this is possible without doing a second server request. Secondly, if it is possible, how it is done?


Comments

  • #2
    Colonel Panic
    Registered Users, Registered Users 2 Posts: 2,029 ✭✭✭Colonel Panic


    If you are generating the page dynamically, why can't you put the JSON into a javascript variable when the page is built by the controller?

    That said, I would probably just get the data in a 2nd request on client side load and not really worry about it too much.


  • #3
    ChRoMe
    Registered Users, Registered Users 2 Posts: 2,021 ✭✭✭ChRoMe


    Colonel Panic wrote: »
    That said, I would probably just get the data in a 2nd request on client side load and not really worry about it too much.

    Far simpler and tidier


  • #4
    SimonTemplar
    Registered Users, Registered Users 2 Posts: 2,815 ✭✭✭SimonTemplar


    Colonel Panic wrote: »
    If you are generating the page dynamically, why can't you put the JSON into a javascript variable when the page is built by the controller?

    That said, I would probably just get the data in a 2nd request on client side load and not really worry about it too much.

    Maybe I'm a little native about the number of server requests for a page. According to Firebug, the ryanair homepage makes 79 requests for different resources (images, js files, CSS, etc). I foolishly assumed all that was sent in one response.

    If that is the case, another request for JSON data doesn't seem too bad.


  • #5
    Meritor
    Registered Users, Registered Users 2 Posts: 39 ✭Meritor


    Its always better to send another request to get data for better UI experience rather than worrying about cost of another request made from client.
    If you get all the data in very first request it definitely will take time for page to load. So, by the time User watches the loaded page and ready for another action, another request would have brought the data from server.


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