Home > Developer > JavaScript

HTML5 canvas+ native JavaScript real-time Get text box content draw picture watermark

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Recently, a customer asked to add text watermark effect on the webpage picture, and the content is obtained from the text input box of the current webpage in real time, studied a half-day, in the net also refer to a lot of friends of the method, plus the garden enthusiastic good buddies help finally realized, first look at:

The code is as follows:

1 <!DOCTYPE HTML>                                                                        2 <Head>3     <MetaCharSet= "UTF-8">4     <title>Drawing by input text</title>                                                                            5 </Head>6 7 <Body>8 <CanvasID= "MyCanvas"width= "+"Height= "$" >9 Your Browser does not support the HTML5 canvas tag.Ten </Canvas> One  A <Script>                                                     -      - window.onload= function () { the         -         varimg= NewImage (); - img.src= './img/demo.jpg'; - Img.onload= function () { +             // -             varCanvas=document.getElementById ("MyCanvas"); +             varCTX=Canvas.getcontext ("2d");  A             // at ctx.drawimage (IMG,0, 0); -  - Ctx.font= "80px Microsoft Yahei"; - Ctx.fillstyle= "Rgba (252,255,255,0.8)"; -             //the contents of the text box are added to the picture area. - document.getElementById ("btn"). onclick= function () { in Ctx.filltext (document.getElementById ("text"). Value, -,  $); -             //document.getElementById ("text"). Value = ""//You can choose whether to empty the contents of the input box to     } +     } -     }     the </Script> *  $ <BR> Panax Notoginseng <inputtype= "text"ID= "text"value="" /> - <inputtype= "button"ID= "BTN"value= "Submit"Click= "Draw" /> the                                                                          + </Body> A </HTML>

HTML5 canvas+ native JavaScript real-time Get text box content draw picture watermark

@ Rizhao star qq:469135789 reprint please indicate the source, retain the copyright information.

HTML5 canvas+ native JavaScript real-time Get text box content draw picture watermark

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
javascript canvas draw html5 canvas text editor get rid of watermark on picture android canvas draw canvas draw transparent rectangle javascript get content from url html5 canvas clock
Related Article
JavaScript solution to the eight Queens Problem method summar...
The difference between single and double quotes in JavaScript...
Http status code: 301, 302 redirection, 302 redirection

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More