javascript - Storing $.getJSON() response to local var -

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this question has answer here:

i need use function several times , wanted avoid writing same method on , over. wanted use $.getjson() response , store in var returned. way can call method.

function startfilter(){             var grid = [];             $.getjson('data/griddata1.json',function(json){                 grid = json;                 console.log(grid);             });             console.log(grid);             return grid;         }

the grid var set inside of .getjson not outside of .getjson. ideas why, , if more info needed let me know?

the ajax calls async. here how things positioned in time.

function startfilter(){     var grid = []; // (1)     $.getjson('data/griddata1.json', function(json){  // (2)         grid = json;  // (5)         console.log(grid); // (6)     });     console.log(grid);  // (3)     return grid;  // (4) }

you should use callbacks build logic:

function startfilter(callback) {     $.getjson('data/griddata1.json', callback); }  var grid = []; startfilter(function(json) {     grid = json;     // logic here });

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