fabric js bold italic not working because of font styles object in json

Question

I am facing 1 typical issue in fabric js, I am converting canvas to json using canvas.toJson and saved it into database. Later i am loading that json into canvas using loadFromJSON which all working ok.

Now issue is, i have json which has many layers and one layer is textbox which has some styles on fonts, so json of that layer is like,

 {
     "type":"textbox",
     "originX":"center",
     "originY":"top",
     "left":1200.84,
     "top":573.63,
     "width":312.81,
     "height":127.46,
     "fill":"rgb(0, 0, 0)",
     "stroke":null,
     "strokeWidth":1,
     "strokeDashArray":null,
     "strokeLineCap":"butt",
     "strokeLineJoin":"miter",
     "strokeMiterLimit":10,
     "scaleX":1,
     "scaleY":1,
     "angle":0,
     "flipX":false,
     "flipY":false,
     "opacity":1,
     "shadow":null,
     "visible":true,
     "clipTo":null,
     "backgroundColor":"",
     "fillRule":"nonzero",
     "globalCompositeOperation":"source-over",
     "transformMatrix":null,
     "lockMovementX":false,
     "lockMovementY":false,
     "evented":true,
     "overrideSecondary":1,
     "text":"NATURAL\nVENEERS",
     "fontSize":63,
     "fontWeight":"",
     "fontFamily":"'trebuchet ms'",
     "fontStyle":"",
     "lineHeight":0.9,
     "textDecoration":"",
     "textAlign":"left",
     "textBackgroundColor":"",
     "styles":{
        "0":{
           "0":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "1":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "2":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "3":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "4":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "5":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "6":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "7":{
              "fontSize":62.666651
           }
        },
        "1":{
           "0":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "1":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "2":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "3":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "4":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "5":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           },
           "6":{
              "fontSize":62.666651,
              "fontFamily":"'trebuchet ms'",
              "fontWeight":"",
              "fontStyle":""
           }
        }
     },
     "minWidth":20
  },

After load json i am doing bold and italic effect using this code.

canvas.getActiveObject().set("fontWeight", "bold");
canvas.renderAll();

Which is working but when i do this,

canvas.getActiveObject().set("fontWeight", "");
canvas.getActiveObject().set("fontWeight", "100");
canvas.getActiveObject().set("fontWeight", "normal");

It will not working. After some investigation i can figure that styles attribute from json causing the issue, If i remove styles from main json object using this code,

delete index['styles'];

Then bold , italic and normal text works for me. See how it behaving before removing and after removing styles HERE .

What is the possible solution for this?

Answer 1

as of now with current fabricjs version there is this problem.

You can just delete the fontWeight property every time you set one new.

example:

function cleanFontWeightStyle(obj) {
    if (obj.styles) {
        var style = obj.styles;
        for (rowIndex in style) {
            var row = style[rowIndex];
            for (letterIndex in row) {
                letter = row[letterIndex];
                if (letter.fontWeight && letter.fontWeight=='') {
                    delete letter['fontWeight'];
                }
            }
        }
    }
}

Ugly. This should be fixed in the library itself that should not create meaningless styles objects.