I am trying to animate the width of something when the .change() function is called, but it doesn't seem to be working.
Any idea why?
Here is my code:
$(document).ready(function(){
$('#code').change(function(){
//on change animate a width of +16px increase.
$(this).animate({width: '+=16'});
});
});
Here is a js fiddle with the issue recreated: http://jsfiddle.net/BUSSX/
If based on your previous question HTML markup :
<button class="I button">I</button>
<button class="O button">O</button>
<input id="code" type="text" disabled />
So if you want to animate the width of the textbox, you need to animate it when click the button:
$('.button').click(function(event) {
var text = $(this).text();
$('input:text').val(function(index, val) {
return val + text;
});
$('#code').animate({width: '+=16'});
});
If based on your above question HTML markup, you need to use keyup instead of change as well as include the jQuery library in the jsFiddle:
$(document).ready(function(){
$('#code').keyup(function(){
//on change animate a width of +16px increase.
$(this).animate({width: '+=16'});
});
});
You just need to check which key was pressed:
$(document).ready(function(){
$('#code').keyup(function(e){
//on change animate a width of +16px increase.
if(e.keyCode == 8) { // Backspace pressed
$(this).animate({width: '-=16'});
} else {
$(this).animate({width: '+=16'});
}
});
});
If you really want a change event for input controls, then here's a jQuery plug-in method I wrote a little while ago that does this and works for nearly all ways that the content of the input control can be changed including drag/drop, copy/paste, typing, etc... It takes advantage of newer events that help with this if they exist, otherwise it falls back to listening for lots of other events and looking to see if the data has changed.
(function($) {
var isIE = false;
// conditional compilation which tells us if this is IE
/*@cc_on
isIE = true;
@*/
// Events to monitor if 'input' event is not supported
// The boolean value is whether we have to
// re-check after the event with a setTimeout()
var events = [
"keyup", false,
"blur", false,
"focus", false,
"drop", true,
"change", false,
"input", false,
"textInput", false,
"paste", true,
"cut", true,
"copy", true,
"contextmenu", true
];
// Test if the input event is supported
// It's too buggy in IE so we never rely on it in IE
if (!isIE) {
var el = document.createElement("input");
var gotInput = ("oninput" in el);
if (!gotInput) {
el.setAttribute("oninput", 'return;');
gotInput = typeof el["oninput"] == 'function';
}
el = null;
// if 'input' event is supported, then use a smaller
// set of events
if (gotInput) {
events = [
"input", false,
"textInput", false
];
}
}
$.fn.userChange = function(fn, data) {
function checkNotify(e, delay) {
var self = this;
var this$ = $(this);
if (this.value !== this$.data("priorValue")) {
this$.data("priorValue", this.value);
fn.call(this, e, data);
} else if (delay) {
// The actual data change happens aftersome events
// so we queue a check for after
// We need a copy of e for setTimeout() because the real e
// may be overwritten before the setTimeout() fires
var eCopy = $.extend({}, e);
setTimeout(function() {checkNotify.call(self, eCopy, false)}, 1);
}
}
// hook up event handlers for each item in this jQuery object
// and remember initial value
this.each(function() {
var this$ = $(this).data("priorValue", this.value);
for (var i = 0; i < events.length; i+=2) {
(function(i) {
this$.on(events[i], function(e) {
checkNotify.call(this, e, events[i+1]);
});
})(i);
}
});
}
})(jQuery);
Then, your code would look like this:
$(document).ready(function(){
$('#code').userChange(function(){
//on change animate a width of +16px increase.
$(this).animate({width: '+=16'});
});
});
In looking at your code, you are increasing the width of the input control by 16px on every change. You probably should be looking at the number of characters in the control and assessing what to do about the width based on that because this will make things wider event if the user hits the backspace key. I'd probably do something like this that grows the item as content is added, but doesn't shrink it:
$(document).ready(function(){
$('#code').userChange(function(){
// on change animate width as chars are added
// only grow it when the width needs to be larger than it is currently
var item = $(this);
var origWidth = item.data("initialWidth");
var curWidth = item.width();
if (!origWidth) {
origWidth = curWidth;
item.data("initialWidth", origWidth);
}
var newWidth = origWidth + (8 * item.val().length);
if (newWidth > curWidth) {
item.stop(true, true).animate({width: newWidth}, 500);
}
});
});
Working code example: http://jsfiddle.net/jfriend00/BEDcR/
If you want the userChange method to execute when you programmatically set the value with .val(), then you can make your own method for that:
$(document).ready(function(){
function updateWidth() {
// on change animate width as chars are added
// only grow it when the width needs to be larger than it is currently
var item = $(this);
var origWidth = item.data("initialWidth");
var curWidth = item.width();
if (!origWidth) {
origWidth = curWidth;
item.data("initialWidth", origWidth);
}
var newWidth = origWidth + (8 * item.val().length);
if (newWidth > curWidth) {
item.stop(true, true).animate({width: newWidth}, 500);
}
}
$('#code').userChange(updateWidth);
$.fn.valNotify = function(value) {
this.val(value);
this.each(function() {
updateWidth.call(this);
});
return this;
}
});
Then, you can change your values with this and it will automatically resize too:
$("#code").valNotify("foo");
You forgot to load jQuery, working fine here http://jsfiddle.net/BUSSX/13/ - also you need the click event. Or even better use the keyup event so that as soon as something is typed, the textbox increases in width - http://jsfiddle.net/BUSSX/15/
IrfanM, instead of incrementing by a fixed amount, you might consider incrementing by just the right amount to accommodate each character as it is typed.
Unless I've overcomplicated things (not completely unknown), this is moderately tricky.
In the following jQuery plugin :
<span> with the same font-family and font-size as its respective input element.<span> elements act as "measuring sticks" by accepting a copy of their input field's entire text every time a character is typed. <span> plus one generous character width is then used to determine the width of the input field.Here's the code :
(function ($) {
var pluginName = 'expandable';
$.fn[pluginName] = function () {
return this.each(function (i, input) {
var $input = $(input);
if (!$input.filter("input[type='text']").length) return true;
// Common css directives affecting text width
// May not be 100% comprehensive
var css = {
fontFamily: $input.css('fontFamily'),
fontSize: $input.css('fontSize'),
fontStyle: $input.css('fontStyle'),
fontVariant: $input.css('fontVariant'),
fontWeight: $input.css('fontWeight'),
fontSizeAdjust: $input.css('fontSizeAdjust'),
fontStretch: $input.css('fontStretch'),
letterSpacing: $input.css('letterSpacing'),
textTransform: $input.css('textTransform'),
textWrap: 'none'
};
var $m = $("<span/>").text('M').insertAfter($input).css(css).text('M').hide();
var data = {
'm': $m,
'w': $m.width()
};
$input.data(pluginName, data).keyup(function (e) {
$this = $(this);
var data = $this.data(pluginName);
var w = data.m.html($this.val().replace(/\s/g, " ")).width();
$this.css({
'width': w + data.w
});
}).trigger('keyup');
});
};
})(jQuery);
$(document).ready(function () {
$('input').expandable();
});
This works because a <span> element automatically expands to accommodate its text, whereas an <input type="text"> element does not. A great feature of this approach is that the keystrokes don't need to be tested - the plugin automatically responds to character deletions in the same way it responds to character strokes.
It works with proportional and monospaced fonts and even responds appropriately to cut and paste.
The only precaution necessary is to convert spaces to non-breaking spaces, $nbsp;, otherwise HTML renders multiple spaces as a single space in the <span> element.
Of course, it you really want exactly 16px growth for every keystroke, then stick with what you already have.
you have a bad implementation check http://jsfiddle.net/3dSZx/ and you need add jquery to fiddle
JS$(document).ready(function(){
$('#push').click(function(){
//on change animate a width of +16px increase.
$('#code').animate({ width: '+=16'});
});
});
