How to call a JavaScript function after pressing Enter key in Input type="text"?
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?
I am adding my code below, nothing worke开发者_StackOverflow中文版d till now; please please add your corrections to the code, I know the code is too poor.
<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>
You have to use the key code on the event object. For enter, it is 13, so you check for 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);
Well, you can bind an event to the keydown or keypress event, and test what key was pressed.
But it's not usually a good idea. A key event may fire for other reasons, such as the user picking an entry from a keyboard IME.
What you are really trying to do is emulate the behaviour of the Enter key submitting a form. So do it by actually creating a form, putting the input in it, and picking up the submit event on the form. 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.
<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.)
Basically:
- Listen for a
keydown,keyuporkeypressevent - The event object will include the keycode, test that it is the enter key
- Call the function
Due to differences in how browsers handle event binding and keycodes, you are almost certainly best off using a library for this. For example, with YUI 3 and its key-event module:
Y.one('#id_of_my_input').on('key', get, 'press:enter');
Assuming you're using the jQuery JavaScript framework, the following code should work:
$('#my_text_box').keypress(function(e) {
if (e.which == 13) {
get();
}
});
13 is the key code for Enter.
Ideally, the code should be a part of your document.ready setup.
Here's what worked for me:
$("#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.
Or you use this. i think this is the best way because debugging with the console is way easier.
<input id="lookup-field" onchange="name of the function"/>
You are looking for jQuery's change event.
$('#TextBox').change(function(e) {
doSomethingWithString( this.val() );
})
The suggestions regarding keydown and finding the enter key are also valid.
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