在输入类型=“文本”中按Enter键后如何调用JavaScript函数？
[英]How to call a JavaScript function after pressing Enter key in Input type=“text”?
问题描述
How do I call a function, get() , which will retrieve meaning of a word typed in a text box after the user presses the Enter key? 
我如何调用函数get() ，该函数将在用户按下Enter键后检索在文本框中键入的单词的含义？
I am adding my code below, nothing worked till now; 我在下面添加我的代码，到目前为止没有任何效果； please please add your corrections to the code, I know the code is too poor. 请把您的更正添加到代码中，我知道代码太差了。
<script type="text/javascript" src="jquery.js"> </script>
<script type="text/javascript">
function get() {
$('#meaning').hide();
$.post('data.php', { name: form.wordfield.value },
function(output) {
$('#meaning').html(output).fadeIn(1000);
});
}
</script>
</head>
<body>
<div id="container" style="width:100%">
<div id="header">
<ul>
<!-- <li><a href="#">Home</a> </li>-->
</ul>
</div>
<div id="logo" style="width: 10%; float:left; position:fixed; top:0px; z-index:-1;"> <img src="logo.gif"></img></div>
<p>
<div id="searchform">
<form name="form" >
<input type="text" name="wordfield" onKeyup="get();"><input type="button" value="Translate" onClick="get();"> </form>
</div>
<div id="meaningbox">
</div>
<div id="meaning">
</div>
</p>
<div id="ad" style="width: 10%;float:right;"><!-- add section --></div>
<div id="footer">footer div goes here </div>
</div>
</body>
</html>
7 个解决方案
解决方案1
1 2011-08-28 21:47:21
You have to use the key code on the event object. 您必须在事件对象上使用键代码。 For enter, it is 13, so you check for 13. 输入是13，因此请检查13。
<input type="text" id="MyInput" />
document.getElementById("MyInput").addEventListener( "keydown", function( e ) {
var keyCode = e.keyCode || e.which;
if ( keyCode === 13 ) {
// enter pressed
get();
}
}, false);
解决方案2
1 2011-08-28 22:35:22
Well, you can bind an event to the keydown or keypress event, and test what key was pressed. 好了，您可以将事件绑定到keydown或keypress事件，并测试按下了哪个键。
But it's not usually a good idea. 但这通常不是一个好主意。 A key event may fire for other reasons, such as the user picking an entry from a keyboard IME. 按键事件可能由于其他原因而触发，例如用户从键盘IME中选择一个条目。
What you are really trying to do is emulate the behaviour of the Enter key submitting a form. 您真正想做的是模仿Enter键提交表单的行为。 So do it by actually creating a form, putting the input in it, and picking up the submit event on the form. 为此，请实际创建一个表单，将输入内容放入其中，然后在表单上获取submit事件。 You can then be sure you're only getting Enter presses that were intended as a submission, and not have to worry about other Enter presses (or shift-Enter or anything like that), and any device that can fill in forms but doesn't have a normal Enter button will still be able to use the page. 然后，您可以确保仅获得打算作为提交的Enter印刷机，而不必担心其他Enter印刷机（或shift-Enter或类似的东西），以及可以填写表格但没有填写的任何设备如果没有正常的输入按钮，仍然可以使用该页面。
<form id="lookup-form">
<input id="lookup-field"/>
</form>
document.getElementById('lookup-form').onsubmit= function() {
get(document.getElementById('lookup-field').value);
return false;
};
(If you're feeling properly conscientious, you can make it a rel form with an action pointing at a server-side script that does the lookup, so that the functionality works for user-agents without JavaScript.) （如果您有适当的责任心，可以将其指定为相关形式，并通过action指向执行查找的服务器端脚本进行操作，以便该功能适用于不使用JavaScript的用户代理。）
解决方案3
0 2013-11-21 19:35:40
Here's what worked for me: 这对我有用：
$("#inputIDHERE").bind('keypress', function(e) {
if(e.which == 13) {
alert('You pressed enter!');
get();
}
});
I also added <form></form> around my input tag, though that may not be necessary. 我也在输入标签周围添加了<form> </ form>，尽管可能没有必要。
解决方案4
0 2014-04-30 14:53:56
Or you use this. 或者你用这个。 i think this is the best way because debugging with the console is way easier. 我认为这是最好的方法，因为使用控制台进行调试更容易。
<input id="lookup-field" onchange="name of the function"/>
解决方案5
0 2011-08-28 21:43:19
Basically: 基本上：
- Listen for a
keydown,keyuporkeypressevent侦听keydown，keyup或keypress事件 - The event object will include the keycode, test that it is the enter key 事件对象将包含键码，测试其是否为Enter键
- Call the function 调用函数
Due to differences in how browsers handle event binding and keycodes, you are almost certainly best off using a library for this. 由于浏览器处理事件绑定和键码的方式不同，因此几乎可以肯定，最好使用库来实现这一点。 For example, with YUI 3 and its key-event module: 例如，使用YUI 3及其键事件模块：
Y.one('#id_of_my_input').on('key', get, 'press:enter');
解决方案6
0 2011-08-28 21:44:04
Assuming you're using the jQuery JavaScript framework , the following code should work: 假设您使用的是jQuery JavaScript框架 ，则以下代码应正常工作：
$('#my_text_box').keypress(function(e) {
if (e.which == 13) {
get();
}
});
13 is the key code for Enter. 13是Enter键的密码。
Ideally, the code should be a part of your document.ready setup. 理想情况下，代码应成为document.ready设置的一部分。
解决方案7
-1 2011-08-28 21:57:17
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