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前台动态添加表格新行将数据返回到后台

前台html 和 javascript 代码

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        .dd
        {
            background-color: Red;
        }
    </style>
    <script type="text/javascript">
        var rowcount = 0;
        var colName = new Array();
        colName[0] = "col0_";
        colName[1] = "col1_";
        colName[2] = "col2_";
        colName[3] = "col3_";

        function AddRow() {
            rowcount++;
            var table = document.getElementById("tb");
            var tr = document.createElement("tr");
            tr.id = "newRow_" + rowcount;
            for (var i = 0; i < colName.length; i++) {
                var td = document.createElement("td");
                td.className = 'dd';
                td.innerHTML = "<input type='text' value='第" + rowcount + "行 第" + (i + 1) + "列" + "' id='" + colName[i] + rowcount + "'/>";
                tr.appendChild(td);
            }
            table.appendChild(tr);

        }

        function RemoveRow() {
            if (rowcount > 0) {
                var table = document.getElementById("tb");
                var tr = document.getElementById("newRow_" + rowcount);
                if (tr) {
                    table.removeChild(tr);
                    rowcount--;
                }
            }
        }

        function GetData() {
            var result = "";
            for (var i = 1; i <= rowcount; i++) {
                for (var j = 0; j < colName.length; j++) {
                    var id = colName[j] + i;
                    var obj = document.getElementById(id);
                    if (obj) {
                        result += obj.value;
                        result += ",";
                    }
                }
                result += "|";
            }
            return result;
        }

        function Get() {
            var ret = GetData();
            alert(ret);
        }

        function transfer() {
            var ret = GetData();
            document.getElementById("Hidden1").value = ret;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <fieldset style=" 800px; height: 100%;">
            <legend>动态添加新行</legend>
            <div>
                <input id="Button1" type="button" value="增加新行" onclick="AddRow()" />&nbsp;
                <input id="Button2" type="button" value="删除一行" onclick="RemoveRow()" />
                <input id="Button3" type="button" value="提取内容" onclick="Get()" />
                <input id="Submit1" type="submit" value="传递到后台" onclick="transfer()" />
            </div>
            <table id="tb" border="1" style=" 400px; height: 100%;">
                <tr>
                    <th>
                        列一
                    </th>
                    <th>
                        列二
                    </th>
                    <th>
                        列三
                    </th>
                    <th>
                        列四
                    </th>
                </tr>
            </table>
        </fieldset>
    </div>
    <div id="CodeFile">
        <input id="Hidden1" type="hidden" runat="server" />
    </div>
    </form>
</body>
</html>

后台代码

protected void Page_Load(object sender, EventArgs e)
    {
        if (this.IsPostBack)
        {
            string val = this.Hidden1.Value;
            this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "", string.Format("<script>alert('{0}')</script>",val));
        }
    }

实例效果：

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原文地址：https://www.cnblogs.com/net-study/p/3598662.html