购物车js代码_JS实现购物车商品列表结算功能代码3486

最近更新于 3年前

js代码

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 += '
取消选择
' } 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(); }

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