How Do I Upload An Html File To Dev.to
How to plough HTML webpage into an Epitome?
While working in one of my project I had to implement a feature where I have plough an HTML webpage to an Paradigm. The first thought that occurred to me was to utilise an inbuilt library simply like dom-to-image or using Chrome Headless or a wrapper library similar Puppeteer. While working I came across this technique using pure Javascript.
Allow's endeavour to achieve this without using any library.
Converting HTML webpage into an Image past using Sail.
We cannot directly describe the HTML into Canvas due to the security reasons. We will follow some other arroyo which volition exist safer.
Steps
- Create SVG Paradigm that will incorporate the rendering content.
<svg xmlns= "http://www.w3.org/2000/svg" width= "200" height= "200" > </svg>
- Insert a
<foreignObject>element inside the SVG which volition contain the HTML.
<svg xmlns= "http://www.w3.org/2000/svg" width= "200" meridian= "200" >' + <foreignObject width= "100%" height= "100%" > </foreignObject> </svg>
- Add the XHTML content inside the
<foreignObject>node.
<svg xmlns= "http://www.w3.org/2000/svg" width= "200" summit= "200" >' + <foreignObject width= "100%" height= "100%" > <div xmlns= "http://www.w3.org/1999/xhtml" >. <manner>em { color : cherry ;} </way> Hey there... </div> </foreignObject> </svg>
- Create the paradigm object and set the src of an image to the data url of the paradigm.
const tempImg = document . createElement ( ' img ' ) tempImg . src = ' data:image/svg+xml, ' + encodeURIComponent ( ' <svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"><foreignObject width="100%" height="100%"><div xmlns="http://world wide web.w3.org/1999/xhtml">Hey there...</div></foreignObject></svg> ' )
- Depict this Image onto Canvas and set canvas information to target
img.src.
const newImg = document . createElement ( ' img ' ) newImg . src = ' data:epitome/svg+xml, ' + encodeURIComponent ( ' <svg xmlns="http://www.w3.org/2000/svg" width="100" peak="100"><foreignObject width="100%" height="100%"><div xmlns="http://www.w3.org/1999/xhtml">Hey there...</div></foreignObject></svg> ' ) // add consequence listener to image. newImg . addEventListener ( ' load ' , onNewImageLoad ) // method to draw image to sheet and gear up data to target img.src part onNewImageLoad ( eastward ){ ctx . drawImage ( e . target , 0 , 0 ) targetImg . src = canvass . toDataURL () }
You can observe the consummate lawmaking in the CodeSandox!
Reasons why using SVG and Canvass is safety?
Implementation of SVG image is very restrictive as we don't allow SVG prototype to load an external resource fifty-fifty ane that appears on the aforementioned domain. Scripting in an SVG prototype is not allowed, there is no way to access the DOM of an SVG image from other scripts, and DOM elements in SVG images cannot receive input events. Thus there is no manner to load privileged information into a form control (such every bit a full path in a <input blazon="file">) and render information technology.
The restriction that script tin can't directly touch DOM nodes that get rendered to the sheet is important from the security point of view.
I tried to cover this topic and steps in cursory. Please experience gratuitous to add together on related to this topic. 😅
Happy Learning!👩💻
Source: https://dev.to/jasmin/how-to-turn-html-webpage-into-an-image-n1c
Posted by: herrerarialf1948.blogspot.com
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