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仿微信、qq聊天,@好友功能

作者:互联网

文章主要介绍我们平时用的qq,微信输入框里面的@功能

 

 如图,输入@符号 会出现一个ul ul的位置随着@符号的位置变动

下面是代码 希望对大家有用 直接全部复制,在编辑器中打开 即可

<!DOCTYPE html>
<html>

<head>
    <title>聊天</title>
    <style>
        body,
        html {
            padding: 0;
            margin: 0;
        }
        .count{
            background-color: pink;
        }
    </style>
   
</head>

<body>
    <textarea id="text" onkeyup="show(this)" style="width: 340px; height: 210px;"></textarea>
    <br />
    <div id="show" style=" position: absolute;border:1px solid grey;font-size:13px; display:none;">
        <ul id="ul1" style="width:100px;padding: 0 ;list-style:none;">
            <li >1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
            <li class="count">6</li>
        </ul>
    </div>
</body>
</html>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>

 <script type="text/javascript">
        function show(elem) {
            var p = kingwolfofsky.getInputPositon(elem);
            var s = document.getElementById('show');
            var len = $('#text').val()
            var lengths=len.slice(0, document.getElementById('text').selectionStart)  //光标位置
            
            if (lengths.charAt(lengths.length-1)=='@') {
                s.style.display = 'block';
                s.style.top = p.bottom + 'px';
                s.style.left = p.left + 'px';
                $("ul li:last-child").addClass("count").siblings().removeClass('count');
                return
            }else{
                s.style.display = 'none';
                return
            }

            if ($('#text').val().indexOf('@') > -1 && document.getElementById('text').selectionStart == $('#text').val().length) {
                s.style.display = 'block';
                s.style.top = p.bottom + 'px';
                s.style.left = p.left + 'px';
                $("ul li:last-child").addClass("count").siblings().removeClass('count');
            } else {
                s.style.display = 'none';
                return
            }
           


        }
        var kingwolfofsky = {
            /**
            * 获取输入光标在页面中的坐标
            * @param        {HTMLElement}    输入框元素        
            * @return        {Object}        返回left和top,bottom
            */
            getInputPositon: function (elem) {
                if (document.selection) {   //IE Support
                    elem.focus();
                    var Sel = document.selection.createRange();
                    return {
                        left: Sel.boundingLeft,
                        top: Sel.boundingTop,
                        bottom: Sel.boundingTop + Sel.boundingHeight
                    };
                } else {
                    var that = this;
                    var cloneDiv = '{$clone_div}', cloneLeft = '{$cloneLeft}', cloneFocus = '{$cloneFocus}', cloneRight = '{$cloneRight}';
                    var none = '<span style="white-space:pre-wrap;"> </span>';
                    var div = elem[cloneDiv] || document.createElement('div'), focus = elem[cloneFocus] || document.createElement('span');
                    var text = elem[cloneLeft] || document.createElement('span');
                    var offset = that._offset(elem), index = this._getFocus(elem), focusOffset = { left: 0, top: 0 };

                    if (!elem[cloneDiv]) {
                        elem[cloneDiv] = div, elem[cloneFocus] = focus;
                        elem[cloneLeft] = text;
                        div.appendChild(text);
                        div.appendChild(focus);
                        document.body.appendChild(div);
                        focus.innerHTML = '|';
                        focus.style.cssText = 'display:inline-block;width:0px;overflow:hidden;z-index:-100;word-wrap:break-word;word-break:break-all;';
                        div.className = this._cloneStyle(elem);
                        div.style.cssText = 'visibility:hidden;display:inline-block;position:absolute;z-index:-100;word-wrap:break-word;word-break:break-all;overflow:hidden;';
                    };
                    div.style.left = this._offset(elem).left + "px";
                    div.style.top = this._offset(elem).top + "px";
                    var strTmp = elem.value.substring(0, index).replace(/</g, '<').replace(/>/g, '>').replace(/\n/g, '<br/>').replace(/\s/g, none);
                    text.innerHTML = strTmp;

                    focus.style.display = 'inline-block';
                    try { focusOffset = this._offset(focus); } catch (e) { };
                    focus.style.display = 'none';
                    return {
                        left: focusOffset.left,
                        top: focusOffset.top,
                        bottom: focusOffset.bottom
                    };
                }
            },

            // 克隆元素样式并返回类
            _cloneStyle: function (elem, cache) {
                if (!cache && elem['${cloneName}']) return elem['${cloneName}'];
                var className, name, rstyle = /^(number|string)$/;
                var rname = /^(content|outline|outlineWidth)$/; //Opera: content; IE8:outline && outlineWidth
                var cssText = [], sStyle = elem.style;

                for (name in sStyle) {
                    if (!rname.test(name)) {
                        val = this._getStyle(elem, name);
                        if (val !== '' && rstyle.test(typeof val)) { // Firefox 4
                            name = name.replace(/([A-Z])/g, "-$1").toLowerCase();
                            cssText.push(name);
                            cssText.push(':');
                            cssText.push(val);
                            cssText.push(';');
                        };
                    };
                };
                cssText = cssText.join('');
                elem['${cloneName}'] = className = 'clone' + (new Date).getTime();
                this._addHeadStyle('.' + className + '{' + cssText + '}');
                return className;
            },

            // 向页头插入样式
            _addHeadStyle: function (content) {
                var style = this._style[document];
                if (!style) {
                    style = this._style[document] = document.createElement('style');
                    document.getElementsByTagName('head')[0].appendChild(style);
                };
                style.styleSheet && (style.styleSheet.cssText += content) || style.appendChild(document.createTextNode(content));
            },
            _style: {},

            // 获取最终样式
            _getStyle: 'getComputedStyle' in window ? function (elem, name) {
                return getComputedStyle(elem, null)[name];
            } : function (elem, name) {
                return elem.currentStyle[name];
            },

            // 获取光标在文本框的位置
            _getFocus: function (elem) {
                var index = 0;
                if (document.selection) {// IE Support
                    elem.focus();
                    var Sel = document.selection.createRange();
                    if (elem.nodeName === 'TEXTAREA') {//textarea
                        var Sel2 = Sel.duplicate();
                        Sel2.moveToElementText(elem);
                        var index = -1;
                        while (Sel2.inRange(Sel)) {
                            Sel2.moveStart('character');
                            index++;
                        };
                    }
                    else if (elem.nodeName === 'INPUT') {// input
                        Sel.moveStart('character', -elem.value.length);
                        index = Sel.text.length;
                    }
                }
                else if (elem.selectionStart || elem.selectionStart == '0') { // Firefox support
                    index = elem.selectionStart;
                }
                return (index);
            },

            // 获取元素在页面中位置
            _offset: function (elem) {
                var box = elem.getBoundingClientRect(), doc = elem.ownerDocument, body = doc.body, docElem = doc.documentElement;
                var clientTop = docElem.clientTop || body.clientTop || 0, clientLeft = docElem.clientLeft || body.clientLeft || 0;
                var top = box.top + (self.pageYOffset || docElem.scrollTop) - clientTop, left = box.left + (self.pageXOffset || docElem.scrollLeft) - clientLeft;
                return {
                    left: left,
                    top: top,
                    right: left + box.width,
                    bottom: top + box.height
                };
            }
        };
        //$(".text")为要插入的文本框
        //insertContent("( )")括号内为要插入的内容
        (function ($) {
            $.fn.extend({
                insertContent: function (myValue, t) {
                    var $t = $(this)[0];
                    if (document.selection) { // ie
                        this.focus();
                        var sel = document.selection.createRange();
                        sel.text = myValue;
                        this.focus();
                        sel.moveStart('character', -l);
                        var wee = sel.text.length;
                        if (arguments.length == 2) {
                            var l = $t.value.length;
                            sel.moveEnd("character", wee + t);
                            t <= 0 ? sel.moveStart("character", wee - 2 * t
                                    - myValue.length) : sel.moveStart(
                                    "character", wee - t - myValue.length);
                            sel.select();
                        }
                    } else if ($t.selectionStart
                            || $t.selectionStart == '0') {
                        var startPos = $t.selectionStart;
                        var endPos = $t.selectionEnd;
                        var scrollTop = $t.scrollTop;
                        $t.value = $t.value.substring(0, startPos)
                                + myValue
                                + $t.value.substring(endPos,
                                        $t.value.length);
                        this.focus();
                        $t.selectionStart = startPos + myValue.length;
                        $t.selectionEnd = startPos + myValue.length;
                        $t.scrollTop = scrollTop;
                        if (arguments.length == 2) {
                            $t.setSelectionRange(startPos - t,
                                    $t.selectionEnd + t);
                            this.focus();
                        }
                    } else {
                        this.value += myValue;
                        this.focus();
                    }
                }
            })
        })(jQuery);

        
    //点击选中事件
        $('li').on('click',function(e){
            e.stopPropagation()
            var target = e.target || e.srcElement;
            var content = target.innerHTML
            $("#text").insertContent(content);
            document.getElementById('show').style.display = 'none';
        }).on('mouseover',function(e){
            $(this).addClass("count").siblings().removeClass('count');
        })
    //点击输入框让ul消失
        $("#text").on('click',function(e){
            document.getElementById('show').style.display = 'none';
        })
       
        
</script>

 

标签:qq,style,document,top,elem,var,仿微信,好友,left
来源: https://www.cnblogs.com/houjl/p/10718657.html