Javascript 如何检测用户何时在输入字段中按下 Enter
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How to detect when the user presses Enter in an input field
提问by FlyingCat
I only have 1 input field and I want to register onChange and onKeyPress event to detect when the users finish their input or press the Enter key. I need to use javascript only. Thanks for the help.
我只有 1 个输入字段，我想注册 onChange 和 onKeyPress 事件来检测用户何时完成输入或按下 Enter 键。我只需要使用 javascript。谢谢您的帮助。
I have:
我有：
var load = function (){
//I want to trigger this function when user hit Enter key.
}
document.getElementById('co').onchange=load; //works great
document.getElementById('co').onKeyPress=load;
//not sure how to detect when user press Enter
html
html
//no form just a single input field
<input type='text' id='co'>
回答by sachleen
回答by Case
None of these answers as of yet specifically answer this question. The question is in 2 parts. 1. Enter is Pressed. 2. The uses is focused on an input.
到目前为止，这些答案都没有具体回答这个问题。问题分为两部分。1. 按下回车键。2. 用途集中在输入上。
Jquery
查询
$('#input-id').on("keyup", function(e) {
if (e.keyCode == 13) {
console.log('Enter');
}
});
Vanilla JavaScript
原生 JavaScript
inputId = document.getElementById('input-id');
inputId.addEventListener('keyup', function onEvent(e) {
if (e.keyCode === 13) {
console.log('Enter')
}
});
This way ENTER is only detected when the user presses enter FROM that input.
这样 ENTER 仅在用户从该输入中按下 Enter 时才被检测到。
回答by Gibolt
More recent and much cleaner: use event.keyinstead of event.keyCode. No more arbitrary number codes!
更新更干净：使用event.key代替event.keyCode. 没有更多的任意数字代码！
const node = document.getElementById('co');
node.addEventListener('keydown', function onEvent(event) {
if (event.key === "Enter") {
return false;
}
});
回答by SpacedMonkey
To make it cross browser:
要使其跨浏览器：
document.getElementById('foo').onkeypress = function(e) {
var event = e || window.event;
var charCode = event.which || event.keyCode;
if ( charCode == '13' ) {
// Enter pressed
return false;
}
}
See this question for more details: javascript event e.which?
有关更多详细信息，请参阅此问题：javascript event e.which？
回答by Dinesh Vadivelu
use the event.keyCode
使用 event.keyCode
var code = (e.keyCode ? e.keyCode : e.which);
if(code == 13) { //Enter keycode
//Do something
}
There is already a discussion in this link jQuery Event Keypress: Which key was pressed?
回答by Chris Knight
Here is a good link that discusses this topic and provides a working examples
这是一个很好的链接，讨论了这个主题并提供了一个工作示例
function DetectEnterPressed(e) {
var characterCode
if(e && e.which){ // NN4 specific code
e = e
characterCode = e.which
}
else {
e = event
characterCode = e.keyCode // IE specific code
}
if (characterCode == 13) return true // Enter key is 13
else return false
}
回答by A-Sharabiani
I use this code and it works fine:
我使用此代码，它工作正常：
document.getElementById("theIdHere").onkeypressed =
function() {
if(this.event.which === 13)
console('passed');
}
回答by Daniel De León
These day you can do it, in this way:
如今，您可以通过以下方式做到这一点：
document.getElementById('co').addEventListener('keydown',
e => !e.repeat && e.keyCode === 13 && load());
Please notice that load()will run it once.
请注意，load()它将运行一次。
