jQuery HTML to Image Converter: This article explains how to convert div to an image in jquery. Yes, we are going to generate an image from our HTML page on client-side using jQuery. We can also convert a particular part of our Webpage (Asp.net C# Web project/ PHP). All we need HTML tag, and using html2canvas js library we can create images .i.e converting HTML table to Image PNG, JPG or converting DIV, UL, LI tag into Jpg image format. In short using, html2canvas will render HTML to Images which means now we can take the screenshot of Div or any HTML element of a web page.
Where the use of converting HTML to image/picture?
As we know HTML5 gives some excellent feature, for example, we have a Canvas tag on our web page. Now on HTML 5 Canvas, we draw something or let say we create a pie chart using jquery, after that, we want to save this as an Image may be in png or jpg format. We convert Canvas to Image at client-side and later save it on our server.Another example, which I have implemented in my Asp.net C# web project where I had to add multiple images and then drag/shuffle all the images inside a canvas then save and upload this image using jQuery ajax, and give the print command to make Mug Sticker, Tshirt Sticker.
The idea behind it is to let the user add his / her photos. Allow them to arrange or to shuffle it. Later on, save button click using Jquery HTML canvas save the image which will send for printing purpose. Now let's head towards the coding part and see how we can convert HTML to Picture :)
Example:
Step to render HTML to Image [PNG/JGP] using jQuery
- Download and import HTML2Canvas jquery files.
- Add HTML markup.
- jQuery Code: Button click convert HTML to Canvas.
- jQuery Code: Download HTML to IMAGE.
# Download and import HTML2Canvas files.
First, we need to download and import latest jquery library in our web page. You can import your server hosted jQuery file, or you can also use from the Google-hosted site (recommended).For converting HTML to Image, we need to import one more js library, and it is HTML2CANVAS download it and import into the HTML head tag. Now we are done with downloading, so our final head tag looks like as shown below.
<script src="Scripts/jquer_latest_2.11_.min.js" type="text/javascript"></script>
<script src="Scripts/html2canvas.js" type="text/javascript"></script>
# Add HTML markup (HTML element for which we create image)
Let make this article very simple, so now am adding some dummy HTML elements i.e. P tag, but you can add dynamic HTML using jQuery ajax for which you want to generate images. Now we add button tag which creates Image of specific HTML and a download button.On download button click images get downloaded on your local drive. 1st we create a canvas of our HTML elements and then download it to the local drive as a picture, all this done at client-side using jquery.
HTML MARKUP:
<div id="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
padding-left: 25px; padding-top: 10px;">
<strong>Codepedia.info</strong><hr />
<h2 style="color: #3e4b51;">
Html to canvas, and canvas to proper image
</h2>
<p style="color: #3e4b51;">
<b>Codepedia.info</b> is a programming blog. Tutorials focused on Programming ASP.Net,
C#, jQuery, AngularJs, Gridview, MVC, Ajax, Javascript, XML, MS SQL-Server, NodeJs,
Web Design, Software</p>
<p style="color: #3e4b51;">
<b>html2canvas</b> script allows you to take "screenshots" of webpages or parts
of it, directly on the users browser. The screenshot is based on the DOM and as
such may not be 100% accurate to the real representation as it does not make an
actual screenshot, but builds the screenshot based on the information available
on the page.
</p>
</div>
<input id="btn-Preview-Image" type="button" value="Preview" />
<a id="btn-Convert-Html2Image" href="#">Download</a>
<br />
<h3>Preview :</h3>
<div id="previewImage">
</div>#Button click converts HTML to Canvas:
As you see, we have added a preview button. Now on preview button click using HTML2Canvas will render our HTML to Canvas. The code looks like as written below:
var element = $("#html-content-holder"); // global variable
var getCanvas; // global variable
$("#btn-Preview-Image").on('click', function () {
html2canvas(element, {
onrendered: function (canvas) {
$("#previewImage").append(canvas);
getCanvas = canvas;
}
});
});The above-written jQuery code will create a canvas and append it to our div container for preview purpose.
# jQuery: Download HTML to IMAGE / Screenshot of Div content
Here we are ready with our canvas now we just need to download it as Image format. On download button click will convert canvas to png image format you can set any image format. Here's the code for downloading.$("#btn-Convert-Html2Image").on('click', function () {
var imgageData = getCanvas.toDataURL("image/png");
// Now browser starts downloading it instead of just showing it
var newData = imgageData.replace(/^data:image\/png/, "data:application/octet-stream");
$("#btn-Convert-Html2Image").attr("download", "your_pic_name.png").attr("href", newData);
});Conclusion: Here's an easy way to render HTML to image like PNG. As it's easy to create an image from a canvas. But to render standard HTML elements like DIV, UL, LI, Table, P tags to an image we use HTML2Canvas Js library. Using HTML2Canvas will take the screenshot of our HTML web pages.
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