Textbox of Fabric.js does not wrap a long word

Question

I am using the Textbox of Fabric.js. I have given a fixed width. But if a user types a long word without any space that exceeds the given width of

Answer 1

For Fabric.js 3.0.0+ you can use the splitByGrapheme property.

On a Textbox, set it to true:

const letterBreakingTextBox = new fabric.Textbox(yourLongText, {
    width: 200,
    textAlign: 'left', // you can use specify the text align
    splitByGrapheme: true
});

Answer 2

Yes there is a solution that you may like or not to implement word breaking:

override the fabric default function for line breaking:

fabric.Textbox.prototype._wrapLine = function(ctx, text, lineIndex) {
var lineWidth        = 0,
    lines            = [],
    line             = '',
    words            = text.split(' '),
    word             = '',
    letter           = '',
    offset           = 0,
    infix            = ' ',
    wordWidth        = 0,
    infixWidth       = 0,
    letterWidth      = 0,
    largestWordWidth = 0;

for (var i = 0; i < words.length; i++) {
    word = words[i];
    wordWidth = this._measureText(ctx, word, lineIndex, offset);
    lineWidth += infixWidth;

    // Break Words if wordWidth is greater than textbox width
    if (this.breakWords && wordWidth > this.width) {
        line += infix;
        var wordLetters = word.split('');
        while (wordLetters.length) {
            letterWidth = this._getWidthOfChar(ctx, wordLetters[0], lineIndex, offset);
            if (lineWidth + letterWidth > this.width) {
                lines.push(line);
                line = '';
                lineWidth = 0;
            }
            line += wordLetters.shift();
            offset++;
            lineWidth += letterWidth;
        }
        word = '';
    } else {
        lineWidth += wordWidth;
    }

    if (lineWidth >= this.width && line !== '') {
        lines.push(line);
        line = '';
        lineWidth = wordWidth;
    }

    if (line !== '' || i === 1) {
        line += infix;
    }
    line += word;
    offset += word.length;
    infixWidth = this._measureText(ctx, infix, lineIndex, offset);
    offset++;

    // keep track of largest word
    if (wordWidth > largestWordWidth && !this.breakWords) {
        largestWordWidth = wordWidth;
    }
}

i && lines.push(line);

if (largestWordWidth > this.dynamicMinWidth) {
        this.dynamicMinWidth = largestWordWidth;
    }

    return lines;
};

Usage:

var breakingTextbox = new fabric.Textbox(longText, {
        width: 200,
        breakWords: true
});

Answer 3

For fabric 2.0+ Please see Fabric.js 2.0 breakWords Implementation for an implementation for word wrapping long words without spacing.