feat: add usePageCss option, add toCanvasList and toImage method for large html

README.md

@@ -42,7 +42,9 @@ All the top level functions accept DOM node and rendering options, and return a
 - [toSvg](#toSvg)
 - [toJpeg](#toJpeg)
 - [toBlob](#toBlob)
+- [toImage](#toImage)
 - [toCanvas](#toCanvas)
+- [toCanvasList](#toCanvasList)
 - [toPixelData](#toPixelData)
 
 Go with the following examples.
@@ -114,6 +116,16 @@ htmlToImage.toBlob(document.getElementById('my-node'))
   });
 ```
 
+#### toImage
+Get a HTMLImageElement, which is a svg image that you can scale it to a big size and it will not blurred.
+
+```js
+htmlToImage.toImage(document.getElementById('my-node'))
+  .then(function (img) {
+    document.body.appendChild(img);
+  });
+```
+
 #### toCanvas
 Get a HTMLCanvasElement, and display it right away:
 
@@ -124,6 +136,17 @@ htmlToImage.toCanvas(document.getElementById('my-node'))
   });
 ```
 
+#### toCanvasList
+Get a array of HTMLCanvasElement. Not like `toCanvas` which is limited by [canvas size](https://jhildenbiddle.github.io/canvas-size/#/?id=test-results),
+ `toCanvasList` can get rid of the limitation of canvas size, so this can export a very large html:
+
+```js
+htmlToImage.toCanvasList(document.getElementById('my-node'))
+  .then(function (canvasList) {
+    canvasList.map(canvas => document.body.appendChild(canvas));
+  });
+```
+
 #### toPixelData
 Get the raw pixel data as a [Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) with every 4 array elements representing the RGBA data of a pixel:
 
@@ -292,6 +315,15 @@ A string indicating the image format. The default type is image/png; that type i
 When supplied, the toCanvas function will return a blob matching the given image type and quality. 
 
 Defaults to `image/png`  
+
+
+### usePageCss
+
+Use `true` to add a `<style>` tag in svg content which imports all styles of current html page, and do not add computed styles to every node any more(this make svg content so large that Firefox throw errors while load svg as image).
+This will make the svg content much smaller, to resolve problems which caused by html that has large amount of sub nodes.
+
+
+Defaults to `false`  
 
 ## Browsers
 

package.json

@@ -1,7 +1,7 @@
 {
-  "name": "html-to-image",
-  "version": "1.11.11",
-  "description": "Generates an image from a DOM node using HTML5 canvas and SVG.",
+  "name": "html-to-image-big",
+  "version": "1.11.12",
+  "description": "Generates an image from a DOM node using HTML5 canvas and SVG. Support big html page.",
   "main": "lib/index.js",
   "module": "es/index.js",
   "unpkg": "dist/html-to-image.js",
@@ -23,7 +23,7 @@
     "svg"
   ],
   "scripts": {
-    "lint": "eslint 'src/**/*.{js,ts}?(x)' --fix",
+    "lint": "eslint src/**/*.{js,ts} --fix",
     "clean": "rimraf dist es lib",
     "build:esm": "tsc --module esnext --target es2017 --outDir ./es",
     "build:cjs": "tsc --module commonjs --target es5 --outDir ./lib",

src/clone-node.ts

@@ -133,11 +133,11 @@ function cloneCSSStyle<T extends HTMLElement>(nativeNode: T, clonedNode: T) {
       ) {
         value = 'block'
       }
-      
+
       if (name === 'd' && clonedNode.getAttribute('d')) {
         value = `path(${clonedNode.getAttribute('d')})`
       }
-      
+
       targetStyle.setProperty(
         name,
         value,
@@ -170,10 +170,14 @@ function cloneSelectValue<T extends HTMLElement>(nativeNode: T, clonedNode: T) {
   }
 }
 
-function decorate<T extends HTMLElement>(nativeNode: T, clonedNode: T): T {
+function decorate<T extends HTMLElement>(
+  nativeNode: T,
+  clonedNode: T,
+  usePageCss?: boolean,
+): T {
   if (isInstanceOfElement(clonedNode, Element)) {
-    cloneCSSStyle(nativeNode, clonedNode)
-    clonePseudoElements(nativeNode, clonedNode)
+    if (!usePageCss) cloneCSSStyle(nativeNode, clonedNode)
+    if (!usePageCss) clonePseudoElements(nativeNode, clonedNode)
     cloneInputValue(nativeNode, clonedNode)
     cloneSelectValue(nativeNode, clonedNode)
   }
@@ -240,6 +244,6 @@ export async function cloneNode<T extends HTMLElement>(
   return Promise.resolve(node)
     .then((clonedNode) => cloneSingleNode(clonedNode, options) as Promise<T>)
     .then((clonedNode) => cloneChildren(node, clonedNode, options))
-    .then((clonedNode) => decorate(node, clonedNode))
+    .then((clonedNode) => decorate(node, clonedNode, options.usePageCss))
     .then((clonedNode) => ensureSVGSymbols(clonedNode, options))
 }