动态建表的学习总结

在没有学习js之前，当遇到需要建表时，往往都是比较麻烦的，而且不容易根据新的需求来更改。自从学了js之后，再也不用担心这个问题辣。使用js动态建表，在一个页面中出现多个表格时，还可以通过其函数多次调用来快速实现，简直不要太愉快~
　　献上代码，有不足的地方还请指正。
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        table {
            border-collapse: collapse;
        }

        table input {
             80px;
        }
    </style>
</head>
<body>
    <div id="box">
        <input type="button" value="insert" id="btn">
    </div>

    <script>
        var heads = ["姓名", "学科", "成绩", "操作"];

        var datas = [
            {"name":"张三1","subject":"语文1","score":99.8},
            {"name":"张三2","subject":"语文2","score":80.8},
            {"name":"张三3","subject":"语文3","score":70.8},
            {"name":"张三4","subject":"语文4","score":100},
            {"name":"张三5","subject":"语文5","score":60},
            {"name":"张三6","subject":"语文6","score":70},
            {"name":"张三7","subject":"语文7","score":89.8}
        ];

        window.onload = function () {
            var box = document.getElementById("box");

            //刷新表格
            var table = createTable(box,heads,datas);

            //插入一行
            var btn = document.getElementById("btn");
            btn.onclick = function () {
                //新生成一行

                var row = table.insertRow(table.rows.length);
                for (var i = 0; i < 3; i++) {
                    var cell = row.insertCell(i);
                    cell.innerHTML = "<input type='text' />";
                }
                
                cell = row.insertCell(-1);
                cell.innerHTML ='<a href="#">确定</a> <a href="#">取消  </a>';

                //确定 取消
                var sure = cell.children[0];
                var cancel = cell.children[1];

                //给按钮注册事件
                sure.onclick = function () {
                    var td = this.parentNode.parentNode;
                    var t1 = row.cells[0].firstElementChild.value;
                    var t2 = row.cells[1].firstElementChild.value;
                    var t3 = row.cells[2].firstElementChild.value;
                    datas.push({"name":t1,"subject":t2,"score":parseFloat(t3) });
                    //删除表格
                    table.parentNode.removeChild(table);
                    //刷新表格
                    table = createTable(box,heads,datas);

                    return false;
                }

                cancel.onclick = function () {
                    //点击删除本行
                    var tr = this.parentNode.parentNode;
                    tr.parentNode.removeChild(tr);
                }
            }
        }

        function createTable(parent, heads, datas) {
            //创建table
            var table = document.createElement("table");
            parent.appendChild(table);

            table.border = "1px";
            table.style.width = "400px";

            //创建表头
            var thead = table.createTHead();
            thead.style.backgroundColor = "lightgray";
            var row = thead.insertRow(0);

            heads.forEach(function (item, index) {
                var th = document.createElement("th");
                th.style.height = "40px";
                thead.appendChild(th);
                setInnerText(th, item);
            });

            createCells(table, datas);

            function createCells(table, datas) {
                var tbody = document.createElement("tbody");
                table.appendChild(tbody);
                tbody.style.textAlign = "center";

                //根据原始数据添加行、列
                datas.forEach(function (item, index) {
                    var row = tbody.insertRow(index);

                    //添加列
                    var i = 0;
                    for(var key in item) {
                        var cell = row.insertCell(i);
                        i++;
                        setInnerText(cell, item[key]);
                    }

                    //最后一列
                    cell = row.insertCell(i);
                    cell.innerHTML = "<a href='#' index='"+ index +"'>删除</a>";

                    //删除
                    var link = cell.firstElementChild;
                    link.onclick = function () {

                    	//tbody.deleteRow(tbody,this.parentNode.parentNode);  //不加此方法无法任意删除你当前删除的行，总是删除第一行
                        tbody.deleteRow(indexOfRows(tbody,this.parentNode.parentNode));

                        //不添加此方法，则添加新数组时，被删除的也会重新显示。
                        datas.splice(indexOfRows(tbody,this.parentNode.parentNode))
                    }
                });
            }
            return table;
        }



        //返回行的索引
        function indexOfRows(tbody, row) {
            var index = -1;
            for(var i = 0; i < tbody.rows.length; i++) {
                if (tbody.rows[i] === row) {
                    index = i;
                    break;
                }
            }
            return index;
        }

        //设置innerText
        function setInnerText(element,content) {
            if (element.textContent) {
                element.textContent = content;
            }else{
                element.innerText = content;
            }
        }
    </script>
</body>
</html>