Home > Developer > JavaScript
Javascript registers the carriage return event for the button (sets the default button)
This article mainly introduces how to register the carriage return event (set the default button) by using javascript. It is very simple and practical to trigger the button by pressing the Enter key. For more information, see
First of all, I have to say that I am really a rookie in JS. JS and some JS frameworks, such as JQuery, are only in the simple application stage, and of course they are constantly learning, I hope to share with you more about JS in the future. Today, let's start with appetizing and talk about how to set a default button, that is, whether the focus is not on the button, as long as you press enter, it is equivalent to triggering the button click event.
The code is very simple. To complete this function, you only need a few lines of code:
?
| 1 2 3 4 5 6 7 8 |
// Register a key event for the keyListener Method Document. onkeydown = keyListener; Function keyListener (e ){ // When the Enter key is pressed, execute our code If (e. keyCode = 13 ){ // What we want to do } } |
Well, it seems a little too simple. I am a little embarrassed to complete a blog in this way. Finally, we will attach an example of a small program:
?
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 |
<! DOCTYPE html> <Html> <Head> <Meta charset = "UTF-8"> <Title> calculator </title> <Script type = "text/javascript"> Function calculate (){ Var a = document. getElementById ("pre-tax"). value; If (parseInt (a) & gt; 8000 ){ Document. getElementById ("interest"). value = 800 + (a-8000) * 15/100; } Else { Document. getElementById ("interest"). value = a/10; } } // Register a key event for the keyListener Method Document. onkeydown = keyListener; Function keyListener (e ){ // When the Enter key is pressed, execute our code If (e. keyCode = 13 ){ Calculate (); } } </Script> </Head> <Body> Pre-tax salary: <input type = "text" id = "pre-tax"/> <Input type = "button" id = "calculate" value = "calculate" onclick = "calculate ()"/> Interest: <input type = "text" id = "interest" readonly = "readonly"/> </Body> </Html> |
This small instance is very simple, and the code is very understandable, but the things behind the Code are not what the average person can understand. Raise your hand .....
I hope this article will help you design javascript programs.
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
