php - Global Variables with jQuery -


just got footable responsive table plugin work. trying setup php script pull postgresql , return json encoded array.

everything working fine far. close making jquery script work, i'm not sure why variables not passing along.

here script:

  var columns_json;   var rows_json;    jquery(function($){    $.ajax(     {       type: "post",       datatype:"json",       url: "a.php",       data: {action: 'test'},        success: function(data)         {           columns_json = data[0];           rows_json = data[1];            console.log(columns_json);           console.log(rows_json);         },        failure: function(data)          {           alert("something went wrong");         }     });      $('.table').footable(     {        "paging": {"enabled": true},        "filtering": {"enabled": true},        "sorting": {"enabled": true},        "columns": columns_json,        "rows": rows_json                           }); });

if @ console, can see 2 data arrays returned correctly... tried output data make sure correct (no issue there):

console.log(json.stringify(columns_json))

so not understanding jquery is: when update variables declared @ top of scripts within $.ajax function, why json arrays not available @ $('.table').footable( function?

admitting i've been playing jquery little on month new me.

i did find 1 workaround work , suggestion on post. modified script , got work. console throws warning:

"synchronous xmlhttprequest on main thread deprecated because of detrimental effects end user's experience.".

like always, thoughts , suggestions appreciated.

move logic fills table inside success callback.

alternatively can encapsulate logic in function , call function success callback.

the reason code not working, because $.ajax async, meaning not wait server request finish, instead next code executed immediately.

in answer linked find async: false - wich (bad) alternative, because make ajax call wait server response - user if browser frozen.

suggestion: show loading animation/overlay, while you're doing ajax calls may take few seconds finish.

after you've modified code, check if variables still need global.

var columns_json;  var rows_json;    jquery(function($) {      $.ajax({      type: "post",      datatype: "json",      url: "a.php",      data: {        action: 'test'      },        success: function(data) {        columns_json = data[0];        rows_json = data[1];          $('.table').footable({            "paging": {            "enabled": true          },            "filtering": {            "enabled": true          },            "sorting": {            "enabled": true          },            "columns": columns_json,            "rows": rows_json          });      },        failure: function(data) {        alert("something went wrong");      }    });      });


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