javascript - fabric.js 加载带有插入图像的 json 正在破坏 Canvas-6ren

javascript - fabric.js 加载带有插入图像的 json 正在破坏 Canvas

转载作者：行者123 更新时间：2023-11-29 21:45:45

每当我将图像添加到 fabric.js 上的 Canvas 时，我将其保存并在隐藏字段中将其字符串化为 JSON，从 JSON 数据加载的 Canvas 在 console.log 上有 0 个对象，隐藏字段中有 JSON 数据/变量不完整。如果我加载已字符串化的 JSON 数据，图像将被插入并且是我可以编辑的 JSON 中的唯一对象。我的程序可以通过添加文本、形状等保存到 JSON，但是当我添加图像时会发生这种情况。

这是我用来添加图像的代码。

function insertImage(src){
    fabric.Image.fromURL(src, function(image) {
        var scale = 200 / image.width;  
        image.set({ left: 40, top: 40, scaleX: scale, scaleY: scale });

        canvas.centerObject(image);
        canvas.add(image);
        canvas.renderAll();
    });
}

$( ".image-graphic" ).click(function(){
    var imageGraphic = $( this ).attr('src');
    insertImage(imageGraphic);
});

这是之后运行的代码，将其转换为隐藏字段中的 JSON 数据。

$( "#testImage" ).click(function(){
    var $additionalPropertiesData = canvas.toJSON(['selectable','lockmovementX', 'lockmovementY', 'hasControls', 'hasBorders', 'id']);
    $( ".frontData" ).val(JSON.stringify($additionalPropertiesData));
    var $frontPreviewData = $( ".frontData" ).val();
});

这是插入图像之前 JSON 数据的样子

{
  "objects": [
    {
      "type": "i-text",
      "originX": "center",
      "originY": "top",
      "left": 544.68,
      "top": 144.16,
      "width": 307.75,
      "height": 65.54,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "fullName",
      "text": "YOUR NAME",
      "fontSize": "50",
      "fontWeight": "bold",
      "fontFamily": "PT Serif",
      "fontStyle": "",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "center",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "center",
      "originY": "top",
      "left": 544.68,
      "top": 228.48,
      "width": 135.85,
      "height": 28.84,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "jobTitle",
      "text": "Your Job Title",
      "fontSize": 22,
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "center",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "left",
      "originY": "top",
      "left": 45.02,
      "top": 472.44,
      "width": 109.35,
      "height": 20.97,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "phoneNumber",
      "text": "O:888.888.8888",
      "fontSize": "16",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "left",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "center",
      "originY": "top",
      "left": 544.68,
      "top": 384.88,
      "width": 237.27,
      "height": 28.84,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "companyName",
      "text": "COMPANY NAME HERE",
      "fontSize": 22,
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "center",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "left",
      "originY": "top",
      "left": 461.61,
      "top": 436.56,
      "width": 122.17,
      "height": 18.35,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "addressLineOne",
      "text": "Company Address 1",
      "fontSize": "14",
      "fontWeight": "normal",
      "fontFamily": "Open Sans",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "left",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "center",
      "originY": "top",
      "left": 544.68,
      "top": 474.64,
      "width": 87.47,
      "height": 18.35,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "addressLineTwo",
      "text": "Address Line 2",
      "fontSize": "14",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "center",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "left",
      "originY": "top",
      "left": 47.08,
      "top": 433.17,
      "width": 107.83,
      "height": 20.97,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "cellNumber",
      "text": "C:888.888.8888",
      "fontSize": "16",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "left",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "right",
      "originY": "top",
      "left": 1044.34,
      "top": 433,
      "width": 153.52,
      "height": 20.97,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "emailAddress",
      "text": "youremail@email.com",
      "fontSize": "16",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "right",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "right",
      "originY": "top",
      "left": 1042.98,
      "top": 472.44,
      "width": 172.43,
      "height": 20.97,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "webAddress",
      "text": "www.websiteaddress.com",
      "fontSize": "16",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "right",
      "textBackgroundColor": "",
      "styles": {}
    }
  ],
  "background": "",
  "backgroundImage": {
    "type": "image",
    "originX": "left",
    "originY": "top",
    "left": 0,
    "top": 0,
    "width": 1088,
    "height": 638,
    "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",
    "src": "/images/sample.jpg",
    "filters": [],
    "crossOrigin": "",
    "alignX": "none",
    "alignY": "none",
    "meetOrSlice": "meet"
  }
}

这是插入图像后发生的情况。此 JSON 数据无法正确加载并在 console.log 上显示带有 0 个对象的 Canvas 。

{
  "objects": [
    {
      "type": "i-text",
      "originX": "center",
      "originY": "top",
      "left": 544.68,
      "top": 144.16,
      "width": 307.75,
      "height": 65.54,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "fullName",
      "text": "YOUR NAME",
      "fontSize": "50",
      "fontWeight": "bold",
      "fontFamily": "PT Serif",
      "fontStyle": "",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "center",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "center",
      "originY": "top",
      "left": 544.68,
      "top": 228.48,
      "width": 135.85,
      "height": 28.84,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "jobTitle",
      "text": "Your Job Title",
      "fontSize": 22,
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "center",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "left",
      "originY": "top",
      "left": 45.02,
      "top": 472.44,
      "width": 109.35,
      "height": 20.97,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "phoneNumber",
      "text": "O:888.888.8888",
      "fontSize": "16",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "left",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "center",
      "originY": "top",
      "left": 544.68,
      "top": 384.88,
      "width": 237.27,
      "height": 28.84,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "companyName",
      "text": "COMPANY NAME HERE",
      "fontSize": 22,
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "center",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "left",
      "originY": "top",
      "left": 461.61,
      "top": 436.56,
      "width": 122.17,
      "height": 18.35,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "addressLineOne",
      "text": "Company Address 1",
      "fontSize": "14",
      "fontWeight": "normal",
      "fontFamily": "Open Sans",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "left",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "center",
      "originY": "top",
      "left": 544.68,
      "top": 474.64,
      "width": 87.47,
      "height": 18.35,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "addressLineTwo",
      "text": "Address Line 2",
      "fontSize": "14",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "center",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "left",
      "originY": "top",
      "left": 47.08,
      "top": 433.17,
      "width": 107.83,
      "height": 20.97,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "cellNumber",
      "text": "C:888.888.8888",
      "fontSize": "16",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "left",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "right",
      "originY": "top",
      "left": 1044.34,
      "top": 433,
      "width": 153.52,
      "height": 20.97,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "emailAddress",
      "text": "youremail@email.com",
      "fontSize": "16",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "right",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "i-text",
      "originX": "right",
      "originY": "top",
      "left": 1042.98,
      "top": 472.44,
      "width": 172.43,
      "height": 20.97,
      "fill": "#000",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 1.36,
      "scaleY": 1.36,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": true,
      "hasControls": true,
      "hasBorders": true,
      "id": "webAddress",
      "text": "www.websiteaddress.com",
      "fontSize": "16",
      "fontWeight": "normal",
      "fontFamily": "PT Serif",
      "fontStyle": "italic",
      "lineHeight": 1.16,
      "textDecoration": "",
      "textAlign": "right",
      "textBackgroundColor": "",
      "styles": {}
    },
    {
      "type": "image",
      "originX": "left",
      "originY": "top",
      "left": 300,
      "top": 130.27,
      "width": 396,
      "height": 413,
      "fill": "rgb(0,0,0)",
      "stroke": null,
      "strokeWidth": 1,
      "strokeDashArray": null,
      "strokeLineCap": "butt",
      "strokeLineJoin": "miter",
      "strokeMiterLimit": 10,
      "scaleX": 0.51,
      "scaleY": 0.51,
      "angle": 0,
      "flipX": false,
      "flipY": false,
      "opacity": 1,
      "shadow": null,
      "visible": true,
      "clipTo": null,
      "backgroundColor": "",
      "fillRule": "nonzero",
      "globalCompositeOperation": "source-over",
      "selectable": false,
      "hasControls": false,
      "hasBorders": false,
      "src": "/images/stock/8ball.jpg",
      "filters": [],
      "crossOrigin": "",
      "alignX": "none",
      "alignY": "none",
      "meetOrSlice": "meet"
    }
  ],
  "background": "",
  "backgroundImage": {
    "type": "image",
    "originX": "left",
    "originY": "top",
    "left": 0,
    "top": 0,
    "width": 1088,
    "height": 638,
    "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",
    "src": "/images/sample.jpg",
    "filters": [],
    "crossOrigin": "",
    "alignX": "none",
    "alignY": "none",
    "meetOrSlice": "meet"
  }
}

最佳答案

你如何加载你的 json 数据？

尝试:

canvas.loadFromJSON(json, canvas.renderAll.bind(canvas));

这对我有用。

加载图片时需要回调函数。

我的(归结)解决方案看起来像

// activepage contains the currently used canvas

this.clickOpenHandler = function(event) {

  var file = event.target.files[0];   
  // file holds now an [file Object]

  if (file) {
    var reader = new FileReader();
    reader.onload = function(e_onload) {
      var content = e_onload.target.result;     
      // content holds now an [object File], like {"objects":[{"type":"rect","originX":"left", ...

      activepage.canvas.loadFromJSON(content, function () {
        activepage.canvas.renderAll.bind(activepage.canvas); 

        // Here the canvas already holds the read objects.         
        console.log(activepage.canvas.getObjects().length);   // gives 2 in my testcase

        activepage.canvas.renderAll();
        $("#pty_open").val(null);           // reset input element
      });
    }
    reader.readAsText(file);
  }
};

使用这个 HTML 输入元素，您可以选择一个本地 JSON 文件，这会触发 onchange 事件:

   <input id="pty_open" type="file" />

希望这个例子对你有帮助。

PS:注意 onchange 事件。它仅在文件名与上一个文件名不同时触发。当您第二次选择同一个文件时，onchange 不会触发并且什么也不会发生。我用 $("#pty_open").val(null); 语句阻止了这种情况。

关于javascript - fabric.js 加载带有插入图像的 json 正在破坏 Canvas ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31274656/

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javascript - fabric.js 加载带有插入图像的 json 正在破坏 Canvas