Load Json file

[Long Zachary]

Hi all,

I have really go crazy on one problem, how could I load the json data from another source.

I mean, I have a function to generate a json data in back, and get the data in a JSP webpage, as I do alert() function, I could see the data is perfected structured in the screen. But as I use a variable to storage it and use the infoVis to plot it, it only plot one point in the centre also with messy code (BTW, I am doing a small project in Chinese )

please, tell me how could I input the json data that generated outside the js function.

Thanks a lot in advance.

Best Regards,

Long 

[Scott]

Hi Long,

You could just write a JSON file onto your web server and then use an Ajax call in your js to get the JSON into a js variable. For example (assuming use of JQuery):
        var json = null;
        var fd = new $jit.ForceDirected({...
       
        $.ajax({
            type: 'GET',
            url: '/script-to-get-JSON-string.php,
            dataType: 'json',
            async: false,
        success: function(data)
        {
            json = data;
        },
        error: function(XMLHttpRequest, textStatus, errorThrown)
        {
            alert('error obtaining data from server');
            return;
        }
        });

fd.loadJSON(json);

        fd.computeIncremental({
            iter: 5,
            property: 'end',
               onComplete: function(){
                 fd.animate({
                    modes: ['linear'],
                    transition: $jit.Trans.Elastic.easeOut,
                    duration: 5000
                  });
            }
            });

You could also use jQuery's getJSON call if easier (see http://api.jquery.com/jQuery.getJSON/)

Scott.

[Long Zachary]

Dear Scott,

First thank you very very much. and now I have take the json data from server into the page, and I do the alert(json) in the JSP page, it could displayed very well, but as us this variable, it only plot a point in the centre, named "undefined".

As I replace the json variable into the particular string, that displayed by the alert(), it works very well.

Do you know how to fix this, thanks a lot in advance.

Best Regards,

Long

在 2013年3月27日星期三UTC+8上午6时30分47秒，Scott写道：

[Scott]

You probably need to post the relevant code as it's difficult to say what's wrong without seeing the code. If you're getting 'undefined' that would indicate a problem with the variable scope, the JSON object is not being assigned correctly, you are not referencing the right variable or something else altogether.

[Long Zachary]

Dear Scott, 

Thank you very much, I have solve the problem, the reason why it comes as a undefined is that, I have send a String variable from back to front, but in fact the function needs a object variable.

Cheers,

Long

在 2013年4月3日星期三UTC+8上午6时27分57秒，Scott写道：

[Ricky]

long I spend hours trying to figure it out, that eval() function! good luck