Im using the most recent moo release and trying to write a function that evaluates the user given expression on event "keyup". As soon as my test's are passing I put the focus on the next input element automatically to improve the user experience and speed, since he uses the form many times.
So I came up with something like that:
var getNextInputElement = function(element){
returns the next input element
}
var checkDay = function(event){
var input = $('booking_day').get('value');
if (input.length > 1 && input < 32) {
$('booking_day').erase('class');
if (!(event.key == "tab")) {
getNextInputElement($('booking_day')).focus();
}
else {
$('booking_day').focus();
}
}
else if(input.length > 1) {
$('booking_day').set('class','error');
}
else {
$('booking_day').erase('class');
}
};
window.addEvent('domready', function() {
$('new_booking').reset();
$('booking_day').addEvent('keyup', checkDay);
$('booking_day').focus();
});
Works fine so far. But if I try to "shift-tab" back to my input field
getNextInputElement($('booking_day')).focus();
is evaluated and focus reset to the next input field. So the user cannot roll back to previosly entered data. I do not find any possibility to catch that shift-tab event. Since two keys are pressed, there are two events fired. One for "tab" and a second one, but not for "shift". The event.key.code of this event seems to be outside the scope that mootools realizes.
Anyone out there who can help on this problem?
Thanks.
Jason
You can add event for both "Shift+Tab" keys
Link : http://mootools.net/docs/more/Interface/Keyboard
Related
I am working on a module, which should select the only possible value of a Multi- or Single selection field, if there is only one valid value and a empty one available.
So far its working fine, until I use ACLs to disable selection values.
For example, I got a single selection field with 3 possible values. Then I disable 2 of them (ACL - if there is a special Queue selected) so theres only one value (+ an empty one) left.
My module wont pick the last value at first, but when I change anything else on the same page (second onchange call) it will pick the last possible value.
The first if condition checks if the Field has only one possible value in it. When I log the 'Change' array it always got the disbaled values still in there even when the 'change' that called the whole function was the ACL disabling those values.
Im still kinda new to javascript and havent found a solution yet.
I would realy appreciate any help.
$('.TableLike').on("change", function () {
var Change = [];
$('.Row').each( function() {
$(this).children().next().children().next().children().each( function(index) {
Change[index] = $(this).text()
} )
if ( (!Change[2] || /.*Field needed.*/i.test(Change[2])) && Change[0] === "-") {
SoleOption = Change[1];
$(this).children().next().children().next().children().each(function() {
if ($(this).text() === "-") {
$(this).removeAttr("selected");
}
if ($(this).text() === SoleOption) {
$(this).attr("selected", "selected");
}
} )
$(this).children().next().children().children().children().val(SoleOption)
}
SoleOption = "";
Change = [];
} )
} )
I managed to fix the issue with the setTimeout() Method.
So the DOM updated before the ACL did the changes.
I opened up the setTimeout Method after the onChange method and inserted all the code thats supposed to run after the change into the setTimeout method.
I hope this will be helpfull for others in the future.
This question already has answers here:
Throttle event calls in jQuery
(7 answers)
Closed 5 years ago.
I'm working on a live ajax search field. So we have:
<input type="search" id="search">
And I want to trigger the search once the user has stopped typing for 500ms.
I got it working like this:
function throttle(f, delay){
var timer = null;
return function(){
var context = this, args = arguments;
clearTimeout(timer);
timer = window.setTimeout(function(){
f.apply(context, args);
},
delay || 500);
};
}
$('#search').keyup(throttle(function(){
// do ajax
}));
The problem is: if user holds shift key and releases it, the search will trigger regardless. So no new keys are added and the same search term was submitted.
How can I make it so that it triggers only if a new character has been added/removed?
Simply keep track of the state:
var currentSearch = "";
Then whenever a keyup happens, check if the input changed, if not stop updating:
if($("#search").val() === currentSearch) return;
//updated so:
currentSearch = $("#search").val();
Sidenote: as DOM lookup is time intensive you may cache $("#search") ...
You could also use the keyup event, and check if the keycode matches the keys on which you want to act on. Please refer this answer
Adapting that answer to your case:
$('#search').keyup(
function(event) {
var isWordCharacter = event.key.length === 1;
var isBackspaceOrDelete = (event.keyCode == 8 || event.keyCode == 46);
if (isWordCharacter || isBackspaceOrDelete) {
(throttle(function(){
// do ajax
})))();
}
})
You should use input event instead of keyup, which will be triggered only when the value will change.
$('#search').on('input', throttle(function(){
// do ajax
}));
The DOM input event is fired synchronously when the value of an <input>, <select>, or <textarea> element is changed. (For input elements with type=checkbox or type=radio, the input event does not fire when a user clicks the control, because the value attribute does not change.)
But be aware that this event has some problems in IE9/10/11 (and is not supported in previous IE versions at all):
[2] IE 9 does not fire an input event when the user deletes characters from an input (e.g. by pressing Backspace or Delete, or using the "Cut" operation).
[3] IE 10 and 11 has a bug, input event fires on placeholder attribute changes.
But the IE10/11 problem is kind of ok, so it depends on if you need to support IE9.
https://developer.mozilla.org/en-US/docs/Web/Events/input
EDIT: unfortunately change is not a suitable solution as it occurres only after blur (loosing focus of the input). Correct solution is to use input event.
I'm working on a script for our client's project that autotabs you onto the next input field when you've hit the maximum character count for a particular input. For some reason the input value is returning one less than it should be, and therefore tabs to the 'next' input when an extra character is entered above the 'threshold'.
Here's my script to watch the inputs value - ofc, if there is a better way please advise :) -
var watchLength = function (watch) {
watch.onkeypress = function () {
var nextInput = getNextSibling(this);
console.log(this.getAttribute('data-autotab-length'));
console.log(this.value.length);
if (this.value.length == this.getAttribute('data-autotab-length')) {
nextInput.focus();
console.log('Limit reached here');
}
};
};
And a jsFiddle to the working input. The first input is limited to '2' characters, but when you type in 3 it jumps to the next input. I think this is something to do with the keypress/keydown event not reading the initial value, but I'm at a loss of how to fix it. Any help really appreciated.
I'm logging the results in the Console:
http://jsfiddle.net/qdnCZ/
The Problem is, that onkeypress will fire before you want it to. You can simply replace onkeypress by onkeyup, that way you make sure that the <input> elements value is set correctly the time you check it.
See: http://jsfiddle.net/qdnCZ/1/
Yes it will return one less, simply use +1 on the length check. This is beacuse onkeypress event is executed before the field is updated, which means using e.preventDefault() the letter will not appear in the field. You could use onkeyup otherwise.
Use onkeyup instead onkeypress
onkeyup gets fired after field gets updated
if (this.value.length == this.getAttribute('data-autotab-length')) {
nextInput.focus();
console.log('Limit reached here');
return false; // this is prevent the third value being entered
}
Updated fiddle
I would like to get my autocomplete to return a "hidden" property when I blur out of the textbox or press enter. The data is in format {value: "Pal", pts: "30"}. I want to obtain pts. Here's an example:
http://jsfiddle.net/ctuAg/4/
Typing a letter or two and choosing a name from the dropdown updates the "points" textbox as expected (10 times the name length). Now, I'd like to know if there's a way of triggering this points update when a name is fully typed and then Enter is pressed, or blurred (tab or mouse click). That is, have the autocomplete search a match to the textbox value and update points.
So far as I've seen only clicking on a name in the dropdown causes the points to be updated.
I did some searching and the closest function/trigger I found was search. I tried placing this inside blur but .pts returns undefined. This might be the answer, how should I use it in my case?
$("#autocomp").autocomplete({
search: function(event, ui) {
alert(ui.item.pts);
}
});
As a basic extension of your example, you can simply check whether the value of #autocomp is in the array on enter press:
$("#autocomp").keypress(function(event) {
var keycode = (event.keyCode ? event.keyCode : event.which);
if(keycode == '13') {
$("#status").append("Enter pressed\n");
/* NEW CODE HERE */
// loop through the array and check the value against available names
for ( var i = 0, l = names.length; i < l; i++) {
// if the name matches, update #points
if ($(this).val() === names[i].value) {
$("#points").val(names[i].pts);
}
}
/* END NEW CODE */
$("#points").focus();
}
});
Though it might not be the most efficient way to do it, it gets the job done. Fiddle here: http://jsfiddle.net/ctuAg/6/
I need to fire an event anytime the content of a textbox has changed.
I cant use keyup nor can I use keypress.
Keyup and keydown doesn't work if you hold down on the key.
Keypress triggers before the text has actually changed. It doesn't recognize backspace or delete either.
So now I'm assuming I'm going to have to build some custom logic or download a plugin. Are there any plugins out there? Or if I should build one, what constraints should I look out for?
For eg. Facebook does it with their search at the top. you can press and hold.
another example is writing a stackoverflow question. Right below the editor, the contents are copied in real time, backspace and everythng works. How do they do it?
I just took a look at SO's source. It looks like they do something a lot like this:
function updatePreview(){
$('div').text($('textarea').val());
}
$('textarea').bind('keypress', function(){
setTimeout(updatePreview, 1);
}
);
They do some extra stuff to make HTML tags for bold and italics and links and such and they time it. They increase the delay from 1 to longer if it takes too long to generate the HTML.
I had success using jQuery (in Chrome). If you hold a key down, it counts every change, not just the first one, and it counts non-print keys like backspace.
HTML
<input id="txt" type="text" />
<span id="changeCount">0</span>
JavaScript
$('#txt').keydown(function(event) {
// Don't count the keys which don't actually change
// the text. The four below are the arrow keys, but
// there are more that I omitted for brevity.
if (event.which != 37 && event.which != 38 &&
event.which != 39 && event.which != 40) {
// Replace the two lines below with whatever you want to
// do when the text changes.
var count = parseInt($('#changeCount').text(), 10) + 1;
$('#changeCount').text(count);
}
});
Like I said above, you'll want to filter out all of the key codes that don't change the text, like ctrl, shift, alt, enter, etc. There's also the boundary condition if you press the backspace or delete key when the textbox is empty or if the textbox has a maximum length and a printable key is pressed, but it's not terribly difficult to handle those either.
Here's a working jsfiddle example.
How about a poll? Do a setInterval and call a function that checks the text say every 500ms? You don't want to detect content change on every key anyway because it gets kinda slow in some older browser/older computer and you would notice a lag between typing and the text displaying.
You need a watcher type functionality.
It resorts to setInterval polling if the other features are not available: http://james.padolsey.com/javascript/monitoring-dom-properties/
I have a simple solution that we use happily in one of our project.
you can try it # http://jsfiddle.net/zSFdp/17/
var i = 0;
$('#text').bind('check_changed', function(){
var t = $(this);
// do something after certain interval, for better performance
delayRun('my_text', function(){
var pv = t.data('prev_val');
// if previous value is undefined or not equals to the current value then blablabla
if(pv == undefined || pv != t.val()){
$('#count').html(++i);
t.data('prev_val', t.val());
}
}, 1000);
})
// if the textbox is changed via typing
.keydown(function(){$(this).trigger('check_changed')})
// if the textbox is changed via 'paste' action from mouse context menu
.bind('paste', function(){$(this).trigger('check_changed')});
// clicking the flush button can force all pending functions to be run immediately
// e.g., if you want to submit the form, all delayed functions or validations should be called before submitting.
// delayRun.flush() is the method for this purpose
$('#flush').click(function(){ delayRun.flush(); });
The delayRun() function
;(function(g){
var delayRuns = {};
var allFuncs = {};
g.delayRun = function(id, func, delay){
if(delay == undefined) delay = 200;
if(delayRuns[id] != null){
clearTimeout(delayRuns[id]);
delete delayRuns[id];
delete allFuncs[id];
}
allFuncs[id] = func;
delayRuns[id] = setTimeout(function(){
func();
delete allFuncs[id];
delete delayRuns[id];
}, delay);
};
g.delayRun.flush = function(){
for(var i in delayRuns){
if(delayRuns.hasOwnProperty(i)){
clearTimeout(delayRuns[i]);
allFuncs[i]();
delete delayRuns[i];
delete allFuncs[i];
}
}
};
})(window);
Zurb has a great plugin which might be useful for you
http://www.zurb.com/playground/jquery-text-change-custom-event