jquery - 调整大小/提交表单后，textarea 高度不会恢复正常

Question

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。

当文本超过一行时，插件通过调整高度大小并跟随字符串内容正常工作，但在我提交它之后，textarea 字段不会恢复到正常高度。它需要刷新才能恢复到正常高度。有没有我可以用来修复它的简单代码？

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();
        });
    };
}));

Answer 1

您可以在提交前保存原始高度，然后在提交表单后恢复吗？

var OriginalHeight = $("#text-area").height();
$("#button").click(function(){
    $.post("submit.php",{val1:val1,receiver1:receiver1},
           function(output){
            $("#posting").append(output);
    });
    $("#text-area").height(OriginalHeight);
});

将#text-area 替换为您的文本区域正确 ID。

编辑:
奇迹般有效 http://jsfiddle.net/Quvku/
确保在这个脚本之前包含 jQuery，如果你不确定是否将脚本包装在

$(document).ready(function() {
//place script here
});