IN APP.JS

(currentGameState == gameStates.running)
    {
        context.textBaseline = 'middle';
        context.textAlign = "center";
        context.font = '40pt Calibri';
        policeSize = 40;
        context.fillStyle = 'white';
        context.textBaseline = 'middle';
        context.textAlign = 'center';
        clearCanvas();
        dessinerMap(1,context); // NO ERRORS BUT NOT DRAWING :(
        context.fillStyle = "#FF0000";

context.fillRect(100,100,250,175); // WORKING

context.drawImage(brique, 250, 80); // WORKING because "brique" is created at the beginning of the file

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IN MAP.JS

function drawMap(index, canvas){

    $.ajax(
    {
    url : '../map/' + "level"+index+'.json',
       type : 'GET',



       dataType : 'json',
       success: function(result){
        console.log(result.tilesets[0].name);
         var image = new Image();
        image.src = 'images/'+result.tilesets[0].name+'.png';

        image.onload = function() {
        console.log(image.src);
        canvas.drawImage(image, 0, 0);
    };


    }});
}