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// From http://stackoverflow.com/questions/931207/is-there-a-jquery-autogrow-plugin-for-text-fields
(function ($) {
$.fn.autoGrowInput = function (o) {
o = $.extend({
maxWidth:1000,
minWidth:0,
comfortZone:70
}, o);
this.filter('input:text').each(function () {
var minWidth = o.minWidth || $(this).width(),
val = '',
input = $(this),
testSubject = $('<tester/>').css({
position:'absolute',
top:-9999,
left:-9999,
width:'auto',
fontSize:input.css('fontSize'),
fontFamily:input.css('fontFamily'),
fontWeight:input.css('fontWeight'),
letterSpacing:input.css('letterSpacing'),
whiteSpace:'nowrap'
}),
check = function () {
if (!input.val()) {
var placeholder = input.attr("placeholder");
// console.log("Using input placeholder as val: " + placeholder);
val = placeholder;
} else if (val === (val = input.val())) {
return;
}
// Enter new content into testSubject
var escaped = val.replace(/&/g, '&amp;').replace(/\s/g, '&nbsp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
testSubject.html(escaped);
// Calculate new width + whether to change
var testerWidth = testSubject.width(),
newWidth = (testerWidth + o.comfortZone) >= minWidth ? testerWidth + o.comfortZone : minWidth,
currentWidth = input.width(),
isValidWidthChange = (newWidth < currentWidth && newWidth >= minWidth)
|| (newWidth > minWidth && newWidth < o.maxWidth);
// Animate width
if (newWidth > o.maxWidth) {
input.width(o.maxWidth);
} else if (isValidWidthChange) {
input.width(newWidth);
}
};
testSubject.insertAfter(input);
$(this).bind('keyup keydown blur update change', check);
});
return this;
};
})(jQuery);
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