How to detect when an enter is pressed using jQuery? - javascript

I am trying to detect what key is pressed and based on that I want to fire click() event.
My code work for all the key except for the enter.
for some reason when I press "enter" I do not get any messages on the screen as if the enter button was not pressed.
Here is my code
$(function(){
$(document).keypress(function(e) {
handleKeyPress(e);
});
function handleKeyPress( e ){
var key = e.which;
alert(key);
if( getIcwsTabIndex() != 1){
return;
}
if( key >= 48 && key <= 57){
var k = key - 48;
$('#icwsDialerNumber' + k).click();
}
if( key == 8){
e.preventDefault();
$('#icwsDialerScreenDel').click();
}
if( key == 13){
e.preventDefault();
$('#icwsDialerNumberDial').click();
}
}
});
what am I doing wrong here?

tested your code, it works on chrome besides the not defined getIcwsTabIndex
so verify it is ok on your side
here is a fiddle check the console
$(function(){
$(document).keypress(function(e) {
handleKeyPress(e);
});
function handleKeyPress( e ){
var key = e.which;
console.log(key);
// if( getIcwsTabIndex() != 1){
// return;
// }
if( key >= 48 && key <= 57){
var k = key - 48;
$('#icwsDialerNumber' + k).click();
}
if( key == 8){
e.preventDefault();
$('#icwsDialerScreenDel').click();
}
if( key == 13){
e.preventDefault();
console.log(key);
$('#icwsDialerNumberDial').click();
}
}
});

The problem with your code is that is not cross-browser. It should be:
var key = e.charCode || e.keyCode || 0;

Related

Jquery - append after remove

after press key "," i append new input, when i use backspace last input is removed, but after delete all inputs when i press again "," code return all inputs, not one. how fix it?
http://jsfiddle.net/3r79hyoL/
$(".multipleField").keyup(function(e) {
var key = e.which ? e.which : event.keyCode;
if (key == 110 || key == 188) {
e.preventDefault();
var value = $(this).val();
$(this).val(value.replace(",", ""));
$(this).first().clone().appendTo(".multipleFields").focus().val("");
event.preventDefault();
$(this).addClass('makeBorder');
replaceAndCopy();
}
if (key == 8) {
e.preventDefault();
if ($(".multipleFields").last().val() == "" && $(".multipleField").length > 1) {
$(".multipleField").last().remove();
$(".multipleField").last().focus();
}
}
});
function replaceAndCopy() {
$(".multipleField").keyup(function(e) {
var key = e.which ? e.which : event.keyCode;
if (key == 110 || key == 188) {
e.preventDefault();
var value = $(this).val();
$(this).val(value.replace(",", ""));
$(this).clone().appendTo(".multipleFields").focus().val("");
$(this).addClass('makeBorder');
replaceAndCopy();
}
if (key == 8) {
if ($(".multipleFields").last().val() == "" &&
$(".multipleField").length != 1) {
$(".multipleField:last").remove();
e.preventDefault();
$(".multipleField").last().focus();
}
}
});
}
The problem is that you are attaching new event listeners to every input. So when you go back to an input that is not the last one the event is fired more than one time.
function replaceAndCopy() {
// Add new event listener to all inputs, instead of the last
// $(".multipleField").keyup(function(e) {
// Change to
$(".multipleField").last().keyup(function(e) {
var key = e.which ? e.which : event.keyCode;
if (key == 110 || key == 188) {
e.preventDefault();
var value = $(this).val();
$(this).val(value.replace(",", ""));
$(this).clone().appendTo(".multipleFields").focus().val("");
$(this).addClass('makeBorder');
replaceAndCopy();
}
if (key == 8) {
if ($(".multipleFields").last().val() == "" && $(".multipleField").length != 1) {
$(".multipleField:last").remove();
e.preventDefault();
$(".multipleField").last().focus();
}
}
});

Working with multiple key press events (windows key)

While working with the multiple keypress events i found this code which worke fine
$(document).bind('keypress', function(event) {
if( event.which === 65 && event.shiftKey ) {
alert('you pressed SHIFT+A');
}
});
But to make it to work wth combinig with windows key... like
event.which === 65 && event.windowsKey
it failed...
Is there any option to make it work with windows key?
if it is a mac machine there is no key as windows..so what could be the alternate option for windows key in mac
Use keyup event.
On a Mac left Command is which = 91, right Command is which = 93. I can't tell what are those on Windows, but you can test it yourself. As #ian commented they should be 91 and 92 respectively.
To test
$(document).on('keyup', function(e) {
var modKey = "";
if (e.shiftKey) modKey += "shiftKey,";
if (e.ctrlKey) modKey += "ctrlKey,";
if (e.altKey) modKey += "altKey,";
if (e.metaKey) modKey += "metaKey,";
console.log ("which: " + e.which + " modkey: " + modKey );
});
UPDATE: Try use keydown event and event.metaKey
$(document).on('keydown', function(e) {
if(e.which === 65 && event.metaKey ) {
console.log ("You pressed Windows + A");
}
});
Remember the key you pressed before. Like if you press shift. get a boolean or something to shiftPressed = true on a onKeyRelease make it false again. That way you can check if shiftPressed == true && aPressed == true before doing something
I made something a while ago for a little WASD game. Perhaps it makes more sense if you see the code:
var up = false;
var down = false;
var left = false;
var right = false;
function keyUp(e) {
keyCode = (e.keyCode ? e.keyCode : e.which);
if (keyCode == 37 || keyCode == 65) {
left = false;
}
if (keyCode == 38 || keyCode == 87) {
up = false;
}
if (keyCode == 39 || keyCode == 68) {
right = false;
}
if (keyCode == 40 || keyCode == 83) {
down = false;
}
}
function forceStopMoving() {
left = false;
up = false;
right = false;
down = false;
}
function keyDown(e) {
keyCode = (e.keyCode ? e.keyCode : e.which);
if (keyCode == 37 || keyCode == 65) {
left = true;
}
if (keyCode == 38 || keyCode == 87) {
up = true;
}
if (keyCode == 39 || keyCode == 68) {
right = true;
}
if (keyCode == 40 || keyCode == 83) {
down = true;
}
}

how to disable the function of ESC key in JavaScript?

In my chat application there are some text fields which gets the user login details.
when filling the user details,If user suddenly pressed the ESC key,the data will be lost.
I need to disable the function of ESC key ? which event I need to use ? how can I do that.
my Java Script code is ,
function esc(e){
e = e || window.event || {};
var charCode = e.charCode || e.keyCode || e.which;
if(charCode == 27){
return false;
}
}
Searched a lot in Stack overflow and google.Nothing worked.Please any one help me to do that . Thanks..
You can bind an eventlistener to your input field to catch the Event when Esc is pressed and supress it.
document.querySelector("input").addEventListener("keydown",function(e){
var charCode = e.charCode || e.keyCode || e.which;
if (charCode == 27){
alert("Escape is not allowed!");
return false;
}
});
Example
I got the solution to control the " F5 , Esc , BackSpace(BS) " keys with the following code.
My Java Script code will be ,
document.attachEvent("onkeydown", win_onkeydown_handler);
function win_onkeydown_handler() {
switch (event.keyCode) {
case 116 : // 'F5'
event.returnValue = false;
event.keyCode = 0;
break;
case 27: // 'Esc'
event.returnValue = false;
event.keyCode = 0;
break;
case 08: // 'BackSpace'
if (event.srcElement.tagName == "INPUT"
|| event.srcElement.tagName == "TEXTAREA") {
} else {
event.returnValue = false;
event.keyCode = 0;
}
break;
}
}
Thanks who are all supported me to do this and for your suggestions.
I have used this for a login popup code:
jQuery(document).keyup(function(e){
if(e.keyCode==27 && popupStatus==1){
// alert('not allowed !!!');
// or any other code
return false;
}
});
I have done something similar using jquery to limit entry to numbers
$(inputBox).keydown(function(event) {
// Allow only backspace and delete
var allowed_keys = [
46, // delete
8, // backspace
];
if ($.inArray(event.keyCode, allowed_keys) != -1) {
// let it happen, don't do anything
}
else {
// Ensure that it is a number and stop the keypress
if (event.keyCode < 48 || event.keyCode > 57 ) {
event.preventDefault();
}
}
});

Firefox keydown backspace issue

I'm building a terminal emulation and running into an issue with capturing backspace in Firefox. I'm able to nab the first backspace and remove the last character on the input at the prompt, but it won't persist and remove more than one character.
Actual website: http://term.qt.io/
Replication here: http://jsfiddle.net/BgtsE/1/
JavaScript code
function handleKeys(e){
var evt = e || window.event;
var key = evt.charCode || evt.keyCode;
if(evt.type == "keydown")
{
curr_key = key;
if(key == 8)
{
evt.preventDefault();
if(0 < $('body').text().length)
$('body').text($('body').text().slice(0,-1));
}
}
else if(evt.type == "keypress")
{
if(97 <= key && key <= 122)
{
if(curr_key != key)
$('body').append(String.fromCharCode(key));
}
else
$('body').append(String.fromCharCode(key));
}
}
$(function(){
$('html').live({
keydown:function(e){
handleKeys(e);
},
keypress:function(e){
handleKeys(e);
}
})
})​
Try this: http://jsfiddle.net/NBZG8/1/
You'll need to handle backspace in both keydown and keypress to support Chrome and Firefox
function handleKeys(e){
var evt = e || window.event;
var key = evt.charCode || evt.keyCode;
if (evt.type == "keydown") {
curr_key = key;
if(key == 8 && !$.browser.mozilla) {
backspaceHandler(evt);
}
} else if (evt.type == "keypress") {
if (key == 8) {
backspaceHandler(evt);
} else if (97 <= key && key <= 122) {
if(curr_key != key) {
$('body').append(String.fromCharCode(key));
}
} else {
$('body').append(String.fromCharCode(key));
}
}
}
function backspaceHandler(evt) {
evt.preventDefault();
if(0 < $('body').text().length) {
$('body').text($('body').text().slice(0,-1));
}
};
$(function(){
$('html').live({
keydown : handleKeys,
keypress : handleKeys
})
})​
In firefox Windows 17.0.1 any value returned by $("selector").text() has an added new line character appended to the end. So the substring didn't work for me:
<html>
<head>
<title>test</title>
<script src="jquery.js"></script>
<script>
$("document").ready(function(){
console.log("body text seems to have a new line character");
console.log(($('body').text()[5]=="\n"));
});
function handleKeys(e){
var evt = e || window.event;
var key = evt.charCode || evt.keyCode;
if(evt.type == "keydown")
{
curr_key = key;
if(key == 8)
{
evt.preventDefault();
if(0 < $('body').text().length)
// next line works, you might trim the \n if it's there at the end
//$('body').text($('body').text().slice(0,-2));
// this one didn't work for me
$('body').text($('body').text().substring(0,$('body').text().length-1));
}
}
else if(evt.type == "keypress")
{
if(97 <= key && key <= 122)
{
if(curr_key != key)
$('body').append(String.fromCharCode(key));
}
else
$('body').append(String.fromCharCode(key));
}
}
$(function(){
$('html').live({
keydown:function(e){
handleKeys(e);
},
keypress:function(e){
handleKeys(e);
}
})
})
</script>
</head>
<body>12345</body>
</html>
I had the same issue with keypress on mozilla.
Thanks to this subject it solves my problem so I'll post my code if anyone try to do the same thing as me.
In my exemple I try to auto space when the user type two numbers, and it didn't work in Firefox so that's my code :
$(function() {
$('#field1, #field2').on('keypress',function(event) {
event = event || window.event;
var charCode = event.keyCode || event.which,
lgstring = $(this).val().length,
trimstring;
if(charCode === 8) {
event.returnValue = false;
if(event.preventDefault)
event.preventDefault();
if(0 < $(this).val().length) {
$(this).val($(this).val().slice(0,-1));
}
}
else if(((charCode > 31) && (charCode < 48 || charCode > 57)) || lgstring >= 14) {
event.returnValue = false;
if(event.preventDefault)
event.preventDefault();
}
else {
trimstring = $(this).val().replace(/ /g,"");
if((lgstring !== 0) && (trimstring.length % 2) === 0 ) {
$(this).val($(this).val() + ' ');
}
}
});
});
I noticed that Mozilla handle the backspace as a keypress where Chrome don't.
Sorry for my English I'm French
$('#id').keypress(function(e) {
if(e.charCode > 0 || e.keyCode === 8){
if(e.keyCode === 8){
return true;
}else if((e.charCode !== 0) && ((e.charCode > 57 && e.charCode < 65)){
return false;
}
}else if((e.keyCode !== 0) && ((e.keyCode > 57 && e.keyCode < 65)){
return false;
}
});

Check capslock is on or off on button click

I have a application in which there is one textbox and a button.I want the application to behave in such a way that when a user types some text in the text box,and after that when the user click the button,it should show whether the capslock is on or off
Take a look at this previous question: How do you tell if caps lock is on using JavaScript? has some great scripts/responses there for you.
In jQuery,
$('#example').keypress(function(e) {
var s = String.fromCharCode( e.which );
if ( s.toUpperCase() === s && s.toLowerCase() !== s && !e.shiftKey ) {
alert('caps is on');
}
});
Avoid the mistake, like the backspace key, s.toLowerCase() !== s is needed.
You have try this code?
function isCapslock(e){
e = (e) ? e : window.event;
var charCode = false;
if (e.which) {
charCode = e.which;
} else if (e.keyCode) {
charCode = e.keyCode;
}
var shifton = false;
if (e.shiftKey) {
shifton = e.shiftKey;
} else if (e.modifiers) {
shifton = !!(e.modifiers & 4);
}
if (charCode >= 97 && charCode <= 122 && shifton) {
return true;
}
if (charCode >= 65 && charCode <= 90 && !shifton) {
return true;
}
return false;
}
You could use the capslockstate jQuery plugin.
When the button is clicked you could then call $(window).capslockstate("state"); and that would tell you the state of the Caps Lock key.
Note that the state of the Caps Lock key doesn't have to be the same as when they type the text and when they click the button.

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