[英]How to add a dropdownlist that's dynamically populated from database to each row in datatable gridview
因此,我创建了一个功能齐全的 gridview,其中最后两列作为从数据库填充的下拉列表,并从中读取/写入。 但是我需要实现对 gridview 的搜索,所以我使用了 Datatables.net 插件,它工作得很好,但是一旦我添加了下拉列表,搜索就会被禁用。 除非我通过 javascript 添加它们,而且我在该领域的经验还不够多,无法自己完成。
在我切换到数据表插件之前,我曾经只是在gridview的Rowdatabound事件中附加我需要的下拉列表,如何通过javascript实现类似的东西?
这是java脚本代码:
var TableContent = "<tr>";
if (!$("#req").length)
$("body").append("<table id='req'></table>");
else
$('#req').prepend($('<thead>').append($('.add_ADU')));
var colns = [
{ "data": "Request_ID", title: "ID", },
{ "data": "Student_ID", visible:true },
{ "data": "Type", visible:true },
{ "data": "Description", visible:true },
{ "data": "Language", visible:true },
{ "data": "PUC", visible:true },
{ "data": "Quantity", title: "Quantity" },
{ "data": "Comments", title: "Comments" },
{ "data": "Fees", title: "Fees" },
{ "data": "Date", title: "Date" },
{ "data": "Payment_Status", title: "Payment Status" },
{ "data": "Payment_Date", title: "Payment Date" },
{ "data": "Student_Name", title: "Student Name", visible:true },
{ "data": "Payment_ID",title:"Payment ID", title: "Phone" },
{ "data": "Addressed_To",title: "Addressed To", visible:true },
{ "data": "username", title:"Assigned To",visible:true },
{ "data": "status", title:"Status",visible:true }
];
var table = $('#req').DataTable({
select: true,
"columns": colns,
"order": [[ 12, "desc" ]],
"initComplete": function (settings, json) {
reset_table_page_length($(window).height());
},
});
$("#req tr").append(
'<select id="assign"' +
'<option value="Paid">him</option>' +
'<option value="NotPaid">her</option>' +
'</select>'
)
$("#req_filter").prepend(
'<select id="inp-sel-status-fltr" class="table-toolbar-inp">' +
'<option value="Paid">Paid</option>' +
'<option value="NotPaid">Not Paid</option>'+
'</select>'
)
$("#inp-sel-status-fltr").change(function myfunction() {
filter_table_by_status($(this).val());
});
function filter_table_by_status(val) {
table.column(10).search(val);
table.draw();
}
尽管很可悲,但这就是我实现我想要实现的目标的程度:
$("#req tr").append(
'<select id="assign"' +
'<option value="Paid">him</option>' +
'<option value="NotPaid">her</option>' +
'</select>')
这是 gridview 的 HTML 代码:
<div class="container">
<asp:GridView BorderWidth="0" CssClass="stripe compact order-column row-border" runat="server" AutoGenerateColumns="true" ID="req" OnRowDataBound="req_RowDataBound" ClientIDMode="Static" Style="width: 100% !important">
<HeaderStyle CssClass="add_ADU" />
</asp:GridView>
在后面的代码中,我只会附加下拉列表,然后查询我需要的数据并使用以下代码填充它们:
protected void req_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DataTable table = new DataTable();
var openCloseddl = e.Row.FindControl("openCloseddl") as DropDownList;
var assignddl = e.Row.FindControl("assignToddl") as DropDownList;
assignddl.DataMember = "username";
assignddl.DataValueField = "username";
assignddl.DataSource = table;
//get the values of the conditions that define which staff
var request_id = e.Row.Cells[0].Text;
var type = e.Row.Cells[3].Text;
var description = e.Row.Cells[4].Text;
var puc = e.Row.Cells[6].Text;
var quantity = e.Row.Cells[7].Text;
//fetch which staff member it's assigned to if exists.
SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["studentOrderUpload"].ConnectionString);
SqlCommand comm = new SqlCommand("SELECT username from request_status WHERE request_id = @request_id and type = @type and description = @description and puc = @puc and quantity = @quantity", conn);
comm.Parameters.AddWithValue("@request_id", request_id);
comm.Parameters.AddWithValue("@type", type);
comm.Parameters.AddWithValue("@description", description);
comm.Parameters.AddWithValue("@puc", puc);
comm.Parameters.AddWithValue("@quantity", quantity);
try
{
conn.Open();
object result = comm.ExecuteScalar();
string resultText = (result == null ? "" : result.ToString());
conn.Close();
//if it's not assigned to anyone, show every staff member.
if (resultText == "")
{
if (type.ToLower().Contains("customized"))
{
SqlCommand cmd1 = new SqlCommand("select username from staff where type = 'customized'", conn);
conn.Open();
SqlDataAdapter ad1 = new SqlDataAdapter(cmd1);
ad1.Fill(table);
conn.Close();
assignddl.DataBind();
assignddl.SelectedValue = "Scholarship";
if (openCloseddl.SelectedValue == "Open")
{
openCloseddl.Enabled = true;
}
assignddl.Items.RemoveAt(1);
}
else
{
SqlCommand cmd1 = new SqlCommand("select username from staff where type ='standard'", conn);
conn.Open();
SqlDataAdapter ad1 = new SqlDataAdapter(cmd1);
ad1.Fill(table);
conn.Close();
assignddl.DataBind();
}
assignddl.Items.Insert(0, new ListItem("Select User"));
openCloseddl.Enabled = false;
if (openCloseddl.SelectedValue == "Open" && type.ToLower().Contains("customized"))
{
openCloseddl.Enabled = true;
}
}
//if it's assigned to someone, show only the assigned staff,
else
{
if (type.ToLower().Contains("customized"))
{
SqlCommand cmd1 = new SqlCommand("select username from staff where type = 'customized'", conn);
conn.Open();
SqlDataAdapter ad1 = new SqlDataAdapter(cmd1);
ad1.Fill(table);
conn.Close();
assignddl.DataBind();
assignddl.SelectedValue = "Scholarship";
if (openCloseddl.SelectedValue == "Open")
{
openCloseddl.Enabled = true;
}
assignddl.Items.RemoveAt(1);
}
else
{
SqlCommand cmd1 = new SqlCommand("select username from staff where type = 'standard'", conn);
conn.Open();
SqlDataAdapter ad1 = new SqlDataAdapter(cmd1);
ad1.Fill(table);
conn.Close();
assignddl.DataBind();
assignddl.SelectedValue = resultText;
}
}
if (openCloseddl != null)
{
SqlCommand comm1 = new SqlCommand("SELECT status from request_status WHERE request_id = @request_id and type = @type and description = @description and puc = @puc and quantity = @quantity", conn);
comm1.Parameters.AddWithValue("@request_id", request_id);
comm1.Parameters.AddWithValue("@type", type);
comm1.Parameters.AddWithValue("@description", description);
comm1.Parameters.AddWithValue("@puc", puc);
comm1.Parameters.AddWithValue("@quantity", quantity);
conn.Open();
object result1 = comm1.ExecuteScalar();
conn.Close();
if (result1.ToString() == "Closed")
{
openCloseddl.SelectedValue = "Closed";
openCloseddl.Enabled = false;
assignddl.Enabled = false;
if ((HttpContext.Current.User.Identity.Name.Equals("DocRequestAdmin")))
{
assignddl.Enabled = true;
openCloseddl.Enabled = true;
}
}
}
}
catch (Exception ee)
{
var error = ee.Message;
conn.Close();
}
var paid = e.Row.Cells[12].Text;
if (paid.Contains("Not"))
{
assignddl.SelectedValue = "Select User";
assignddl.Enabled = false;
openCloseddl.Enabled = false;
}
}
}
在这一点上我相信这是无关紧要的,因为我正在尝试通过 javascript 来做到这一点。
这是网格外观的屏幕截图,我要添加的下拉列表应存在于最后两列“已分配给”和“状态”中
数据表中有一个内置的渲染函数,您可以在列对象中调用它。 该函数接受 3 个参数,第一个是您在“数据”属性中指定的属性的值,第三个将返回整个底层对象的值。
你可以在这里阅读它。
例如:
{
"data": "username",
title:"Assigned To",
visible:true,
render: function(data, type, row) {
//do sth here
}
}
在上面的render函数中, data参数将返回“username”属性的值, row参数将返回底层对象所有属性的值。
您可以使用 row 参数提供的数据将值和 id 附加到下拉列表中。 如果您的 row 参数返回一个对象数组,您可以执行 for 循环来迭代并将每个值附加到 select 元素。
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