Home > Developer > JavaScript
JavaScript onkeypress Events
The onkeypress event is triggered when the user presses or holds a keyboard key.
Note: onkeypress Events and onkeydown events are slightly different, onkeypress events do not do the corresponding function key pressed processing. The following example can be changed to the onkeydown event, you can enter special characters such as!@#$ to realize the difference between the two.
Tips
Internet explorer/chrome Browsers use Event.keycode to retrieve the pressed characters, while browsers such as Netscape/firefox/opera use Event.which.
Allow only numbers to be entered using the onkeypress Event
Here is an example of using the OnKeyPress event to allow users to enter numbers in form fields only:
<body>
<div> Please enter a number: <input type = "text" onkeypress= "return CheckNumber (event);"/>
<span id= "Tip" ></SPAN>
</div>
</body>
</Html>
Event.keycode/event.which gets the numeric value of a key (Unicode encoding), and the common key values are listed in the OnKeyDown Event section. In the example, the value of 8 is specially processed in order to support the BACKSPACE (Backspace) key in the Text field.
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
