我在使用 jquery 的 autosize textarea 插件时遇到问题，我使用 jquery 将数据插入 mysql，因此在传递字符串时页面不需要刷新。
当发短信超过一行时，插件通过调整高度并跟随字符串内容正常工作，但在我提交后，textarea字段不会回到正常高度。它需要刷新到正常高度。有什么简单的代码可以用来修复它吗？
这是我传递值的 jquery 代码：
$("#button").click(function(){
$.post("submit.php",{val1:val1,receiver1:receiver1},
function(output){
$("#posting").append(output);
});
});
这是我使用的 jquery 插件：
/*!
Autosize v1.17.2 - 2013-07-30
Automatically adjust textarea height based on user input.
(c) 2013 Jack Moore - http://www.jacklmoore.com/autosize
license: http://www.opensource.org/licenses/mit-license.php
*/
(function (factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['jquery'], factory);
} else {
// Browser globals: jQuery or jQuery-like library, such as Zepto
factory(window.jQuery || window.$);
}
}(function ($) {
var
defaults = {
className: 'autosizejs',
append: '',
callback: false,
resizeDelay: 10
},
// border:0 is unnecessary, but avoids a bug in FireFox on OSX
copy = '<textarea tabindex="-1" style="position:absolute; top:-999px; left:0; right:auto; bottom:auto; border:0; -moz-box-sizing:content-box; -webkit-box-sizing:content-box; box-sizing:content-box; word-wrap:break-word; height:0 !important; min-height:0 !important; overflow:hidden; transition:none; -webkit-transition:none; -moz-transition:none;"/>',
// line-height is conditionally included because IE7/IE8/old Opera do not return the correct value.
typographyStyles = [
'fontFamily',
'fontSize',
'fontWeight',
'fontStyle',
'letterSpacing',
'textTransform',
'wordSpacing',
'textIndent'
],
// to keep track which textarea is being mirrored when adjust() is called.
mirrored,
// the mirror element, which is used to calculate what size the mirrored element should be.
mirror = $(copy).data('autosize', true)[0];
// test that line-height can be accurately copied.
mirror.style.lineHeight = '99px';
if ($(mirror).css('lineHeight') === '99px') {
typographyStyles.push('lineHeight');
}
mirror.style.lineHeight = '';
$.fn.autosize = function (options) {
options = $.extend({}, defaults, options || {});
if (mirror.parentNode !== document.body) {
$(document.body).append(mirror);
}
return this.each(function () {
var
ta = this,
$ta = $(ta),
maxHeight,
minHeight,
boxOffset = 0,
callback = $.isFunction(options.callback),
originalStyles = {
height: ta.style.height,
overflow: ta.style.overflow,
overflowY: ta.style.overflowY,
wordWrap: ta.style.wordWrap,
resize: ta.style.resize
},
timeout,
width = $ta.width();
if ($ta.data('autosize')) {
// exit if autosize has already been applied, or if the textarea is the mirror element.
return;
}
$ta.data('autosize', true);
if ($ta.css('box-sizing') === 'border-box' || $ta.css('-moz-box-sizing') === 'border-box' || $ta.css('-webkit-box-sizing') === 'border-box'){
boxOffset = $ta.outerHeight() - $ta.height();
}
// IE8 and lower return 'auto', which parses to NaN, if no min-height is set.
minHeight = Math.max(parseInt($ta.css('minHeight'), 10) - boxOffset || 0, $ta.height());
$ta.css({
overflow: 'hidden',
overflowY: 'hidden',
wordWrap: 'break-word', // horizontal overflow is hidden, so break-word is necessary for handling words longer than the textarea width
resize: ($ta.css('resize') === 'none' || $ta.css('resize') === 'vertical') ? 'none' : 'horizontal'
});
function initMirror() {
var styles = {}, ignore;
mirrored = ta;
mirror.className = options.className;
maxHeight = parseInt($ta.css('maxHeight'), 10);
// mirror is a duplicate textarea located off-screen that
// is automatically updated to contain the same text as the
// original textarea. mirror always has a height of 0.
// This gives a cross-browser supported way getting the actual
// height of the text, through the scrollTop property.
$.each(typographyStyles, function(i,val){
styles[val] = $ta.css(val);
});
$(mirror).css(styles);
// The textarea overflow is probably now hidden, but Chrome doesn't reflow the text to account for the
// new space made available by removing the scrollbars. This workaround causes Chrome to reflow the text.
if ('oninput' in ta) {
var width = ta.style.width;
ta.style.width = '0px';
ignore = ta.offsetWidth; // This value isn't used, but getting it triggers the necessary reflow
ta.style.width = width;
}
}
// Using mainly bare JS in this function because it is going
// to fire very often while typing, and needs to very efficient.
function adjust() {
var height, original, width, style;
if (mirrored !== ta) {
initMirror();
}
mirror.value = ta.value + options.append;
mirror.style.overflowY = ta.style.overflowY;
original = parseInt(ta.style.height,10);
// window.getComputedStyle, getBoundingClientRect returning a width are unsupported in IE8 and lower.
// The mirror width must exactly match the textarea width, so using getBoundingClientRect because it doesn't round the sub-pixel value.
if ('getComputedStyle' in window) {
style = window.getComputedStyle(ta);
width = ta.getBoundingClientRect().width;
$.each(['paddingLeft', 'paddingRight', 'borderLeftWidth', 'borderRightWidth'], function(i,val){
width -= parseInt(style[val],10);
});
mirror.style.width = width + 'px';
}
else {
mirror.style.width = Math.max($ta.width(), 0) + 'px';
}
// Needed for IE8 and lower to reliably return the correct scrollTop
mirror.scrollTop = 0;
mirror.scrollTop = 9e4;
// Using scrollTop rather than scrollHeight because scrollHeight is non-standard and includes padding.
height = mirror.scrollTop;
if (maxHeight && height > maxHeight) {
ta.style.overflowY = 'scroll';
height = maxHeight;
} else {
ta.style.overflowY = 'hidden';
if (height < minHeight) {
height = minHeight;
}
}
height += boxOffset;
if (original !== height) {
ta.style.height = height + 'px';
if (callback) {
options.callback.call(ta,ta);
}
}
}
function resize () {
clearTimeout(timeout);
timeout = setTimeout(function(){
if ($ta.width() !== width) {
adjust();
}
}, parseInt(options.resizeDelay,10));
}
if ('onpropertychange' in ta) {
if ('oninput' in ta) {
// Detects IE9. IE9 does not fire onpropertychange or oninput for deletions,
// so binding to onkeyup to catch most of those occasions. There is no way that I
// know of to detect something like 'cut' in IE9.
$ta.on('input.autosize keyup.autosize', adjust);
} else {
// IE7 / IE8
$ta.on('propertychange.autosize', function(){
if(event.propertyName === 'value'){
adjust();
}
});
}
} else {
// Modern Browsers
$ta.on('input.autosize', adjust);
}
// Set options.resizeDelay to false if using fixed-width textarea elements.
// Uses a timeout and width check to reduce the amount of times adjust needs to be called after window resize.
if (options.resizeDelay !== false) {
$(window).on('resize.autosize', resize);
}
// Event for manual triggering if needed.
// Should only be needed when the value of the textarea is changed through JavaScript rather than user input.
$ta.on('autosize.resize', adjust);
// Event for manual triggering that also forces the styles to update as well.
// Should only be needed if one of typography styles of the textarea change, and the textarea is already the target of the adjust method.
$ta.on('autosize.resizeIncludeStyle', function() {
mirrored = null;
adjust();
});
$ta.on('autosize.destroy', function(){
mirrored = null;
clearTimeout(timeout);
$(window).off('resize', resize);
$ta
.off('autosize')
.off('.autosize')
.css(originalStyles)
.removeData('autosize');
});
// Call adjust in case the textarea already contains text.
adjust();
});
};
}));