JS购物车

/**
 * Created by an.han on 13-12-17.
 */
window.onload = function () {
    if (!document.getElementsByClassName) {
        document.getElementsByClassName = function (cls) {
            var ret = [];
            var els = document.getElementsByTagName(‘*‘);
            for (var i = 0, len = els.length; i < len; i++) {

                if (els[i].className.indexOf(cls + ‘ ‘) >=0 || els[i].className.indexOf(‘ ‘ + cls + ‘ ‘) >=0 || els[i].className.indexOf(‘ ‘ + cls) >=0) {
                    ret.push(els[i]);
                }
            }
            return ret;
        }
    }

    var table = document.getElementById(‘cartTable‘); // 购物车表格
    var selectInputs = document.getElementsByClassName(‘check‘); // 所有勾选框
    var checkAllInputs = document.getElementsByClassName(‘check-all‘) // 全选框
    var tr = table.children[1].rows; //行
    var selectedTotal = document.getElementById(‘selectedTotal‘); //已选商品数目容器
    var priceTotal = document.getElementById(‘priceTotal‘); //总计
    var deleteAll = document.getElementById(‘deleteAll‘); // 删除全部按钮
    var selectedViewList = document.getElementById(‘selectedViewList‘); //浮层已选商品列表容器
    var selected = document.getElementById(‘selected‘); //已选商品
    var foot = document.getElementById(‘foot‘);

    // 更新总数和总价格，已选浮层
    function getTotal() {
        var seleted = 0;
        var price = 0;
        var HTMLstr = ‘‘;
        for (var i = 0, len = tr.length; i < len; i++) {
            if (tr[i].getElementsByTagName(‘input‘)[0].checked) {
                tr[i].className = ‘on‘;
                seleted += parseInt(tr[i].getElementsByTagName(‘input‘)[1].value);
                price += parseFloat(tr[i].cells[4].innerHTML);
                HTMLstr += ‘<div><img src="‘ + tr[i].getElementsByTagName(‘img‘)[0].src + ‘"><span class="del" index="‘ + i + ‘">取消选择</span></div>‘
            }
            else {
                tr[i].className = ‘‘;
            }
        }
    
        selectedTotal.innerHTML = seleted;
        priceTotal.innerHTML = price.toFixed(2);
        selectedViewList.innerHTML = HTMLstr;
    
        if (seleted == 0) {
            foot.className = ‘foot‘;
        }
    }

    // 计算单行价格
    function getSubtotal(tr) {
        var cells = tr.cells;
        var price = cells[2]; //单价
        var subtotal = cells[4]; //小计td
        var countInput = tr.getElementsByTagName(‘input‘)[1]; //数目input
        var span = tr.getElementsByTagName(‘span‘)[1]; //-号
        //写入HTML
        subtotal.innerHTML = (parseInt(countInput.value) * parseFloat(price.innerHTML)).toFixed(2);
        //如果数目只有一个，把-号去掉
        if (countInput.value == 1) {
            span.innerHTML = ‘‘;
        }else{
            span.innerHTML = ‘-‘;
        }
    }

    // 点击选择框
    for(var i = 0; i < selectInputs.length; i++ ){
        selectInputs[i].onclick = function () {
            if (this.className.indexOf(‘check-all‘) >= 0) { //如果是全选，则吧所有的选择框选中
                for (var j = 0; j < selectInputs.length; j++) {
                    selectInputs[j].checked = this.checked;
                }
            }
            if (!this.checked) { //只要有一个未勾选，则取消全选框的选中状态
                for (var i = 0; i < checkAllInputs.length; i++) {
                    checkAllInputs[i].checked = false;
                }
            }
            getTotal();//选完更新总计
        }
    }

    // 显示已选商品弹层
    selected.onclick = function () {
        if (selectedTotal.innerHTML != 0) {
            foot.className = (foot.className == ‘foot‘ ? ‘foot show‘ : ‘foot‘);
        }
    }

    //已选商品弹层中的取消选择按钮
    selectedViewList.onclick = function (e) {
        var e = e || window.event;
        var el = e.srcElement;
        if (el.className==‘del‘) {
            var input =  tr[el.getAttribute(‘index‘)].getElementsByTagName(‘input‘)[0]
            input.checked = false;
            input.onclick();
        }
    }

    //为每行元素添加事件
    for (var i = 0; i < tr.length; i++) {
        //将点击事件绑定到tr元素
        tr[i].onclick = function (e) {
            var e = e || window.event;
            var el = e.target || e.srcElement; //通过事件对象的target属性获取触发元素
            var cls = el.className; //触发元素的class
            var countInout = this.getElementsByTagName(‘input‘)[1]; // 数目input
            var value = parseInt(countInout.value); //数目
            //通过判断触发元素的class确定用户点击了哪个元素
            switch (cls) {
                case ‘add‘: //点击了加号
                    countInout.value = value + 1;
                    getSubtotal(this);
                    break;
                case ‘reduce‘: //点击了减号
                    if (value > 1) {
                        countInout.value = value - 1;
                        getSubtotal(this);
                    }
                    break;
                case ‘delete‘: //点击了删除
                    var conf = confirm(‘确定删除此商品吗？‘);
                    if (conf) {
                        this.parentNode.removeChild(this);
                    }
                    break;
            }
            getTotal();
        }
        // 给数目输入框绑定keyup事件
        tr[i].getElementsByTagName(‘input‘)[1].onkeyup = function () {
            var val = parseInt(this.value);
            if (isNaN(val) || val <= 0) {
                val = 1;
            }
            if (this.value != val) {
                this.value = val;
            }
            getSubtotal(this.parentNode.parentNode); //更新小计
            getTotal(); //更新总数
        }
    }

    // 点击全部删除
    deleteAll.onclick = function () {
        if (selectedTotal.innerHTML != 0) {
            var con = confirm(‘确定删除所选商品吗？‘); //弹出确认框
            if (con) {
                for (var i = 0; i < tr.length; i++) {
                    // 如果被选中，就删除相应的行
                    if (tr[i].getElementsByTagName(‘input‘)[0].checked) {
                        tr[i].parentNode.removeChild(tr[i]); // 删除相应节点
                        i--; //回退下标位置
                    }
                }
            }
        } else {
            alert(‘请选择商品！‘);
        }
        getTotal(); //更新总数
    }

    // 默认全选
    checkAllInputs[0].checked = true;
    checkAllInputs[0].onclick();
}

@charset "utf-8";
*{margin:0;padding:0;list-style-type:none;}
a{color:#666;text-decoration:none;}
table{border-collapse:collapse;border-spacing:0;border:0;}
body{color:#666;font:12px/180% Arial, Helvetica, sans-serif, "新宋体";}
clearfix:after{content:".";display:block;height:0;clear:both;visibility:hidden}
.clearfix{display:inline-table}
*html .clearfix{height:1%}
.clearfix{display:block}
*+html .clearfix{min-height:1%}
.fl{float:left;}
.fr{float:right;}

.catbox{width:940px;margin:0 auto;}
.catbox table{text-align:center;width:100%;}
.catbox table th,.catbox table td{border:1px solid #CADEFF;}
.catbox table th{background:#e2f2ff;border-top:3px solid #a7cbff;height:30px;}
.catbox table td{padding:10px;color:#444;}
.catbox table tbody tr:hover{background:RGB(238,246,255);}
.checkbox{width:60px;}
.goods{width:300px;}
.goods span{width:180px;margin-top:20px;text-align:left;float:left;}
.goods img{width:100px;height:80px;margin-right:10px;float:left;}
.price{width:130px;}
.count{width:90px;}
.count .add, .count input, .count .reduce{float:left;margin-right:-1px;position:relative;z-index:0;}
.count .add, .count .reduce{height:23px;width:17px;border:1px solid #e5e5e5;background:#f0f0f0;text-align:center;line-height:23px;color:#444;}
.count .add:hover, .count .reduce:hover{color:#f50;z-index:3;border-color:#f60;cursor:pointer;}
.count input{width:50px;height:15px;line-height:15px;border:1px solid #aaa;color:#343434;text-align:center;padding:4px 0;background-color:#fff;z-index:2;}
.subtotal{width:150px;color:red;font-weight:bold;}
.operation span:hover,a:hover{cursor:pointer;color:red;text-decoration:underline;}

.foot{margin-top:10px;color:#666;height:48px;border:1px solid #c8c8c8;background-color:#eaeaea;background-image:linear-gradient(RGB(241,241,241),RGB(226,226,226));position:relative;z-index:8;}
.foot div, .foot a{line-height:48px;height:48px;}
.foot .select-all{width:100px;height:48px;line-height:48px;padding-left:5px;color:#666;}
.foot .closing{border-left:1px solid #c8c8c8;width:100px;text-align:center;color:#000;font-weight:bold;background:RGB(238,238,238);cursor:pointer;}
.foot .total{margin:0 20px;cursor:pointer;}
.foot  #priceTotal, .foot #selectedTotal{color:red;font-family:"Microsoft Yahei";font-weight:bold;}
.foot .selected{cursor:pointer;}
.foot .selected .arrow{position:relative;top:-3px;margin-left:3px;}
.foot .selected .down{position:relative;top:3px;display:none;}
.show .selected .down{display:inline;}
.show .selected .up{display:none;}
.foot .selected:hover .arrow{color:red;}
.foot .selected-view{width:935px;border:1px solid #c8c8c8;position:absolute;height:auto;background:#ffffff;z-index:9;bottom:48px;left:-1px;display:none;}
.show .selected-view{display:block;}
.foot .selected-view div{height:auto;}
.foot .selected-view .arrow{font-size:16px;line-height:100%;color:#c8c8c8;position:absolute;right:330px;bottom:-9px;}
.foot .selected-view .arrow span{color:#ffffff;position:absolute;left:0px;bottom:1px;}

#selectedViewList{padding:10px 20px 10px 20px;}
#selectedViewList div{display:inline-block;position:relative;width:100px;height:80px;border:1px solid #ccc;margin:10px;float:left;}
#selectedViewList div img{width:100px;height:80px;margin-right:10px;float:left;}
#selectedViewList div span{display:none;color:#ffffff;font-size:12px;position:absolute;top:0px;right:0px;width:60px;height:18px;line-height:18px;text-align:center;background:#000;cursor:pointer;}
#selectedViewList div:hover span{display:block;}