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Oncopy and Onpaste

Source: Internet
Author: User
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In JavaScript, there are corresponding events that listen to copy and paste, which is oncopy and onpaste.

Oncopy:

  • Demo 
    • <body oncopy= "alert (' cannot copy '); return false;" > Can you copy me? </body>


  • Usage scenarios:
    • The page content on very many sites does not agree to replicate, which prevents users or programs from maliciously fetching page data. Once the beginning of reading the novel, is not agree to copy content, now more ruthless, left-click selection and the right-click menu is also blocked.
Onpaste:

  • Demo 
    • <input type= "text" nane= "Cardnum" onpaste= "return false;"/>


  • Usage scenarios:
    • Online bank transfer, enter the other card number, you need to enter two times, usually the second input input box is not agreed to paste, so that to a certain extent, to ensure the accuracy of the card number.

Oncopy and Onpaste

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