gridview asp.net中的javascript计时器

在我的产品表中，我有一个开始日期和结束日期。我想在我的asp.net gridview中显示一个倒计时计时器，当它过期时，它将显示“项目结束”

它显示了：但是如何删除硬编码日期以从sql数据库中选择日期。此外，硬编码日期在gridview表的第一行中只显示一次。 这是aspx页面：

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" CssClass="Grid" AutoGenerateColumns="False" BackColor="White" BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" CellPadding="3" DataKeyNames="ProjectID" DataSourceID="SqlDataSource1" ForeColor="Black" PageSize="50" GridLines="Vertical">
            <AlternatingRowStyle BackColor="#CCCCCC" />
            <Columns>
                 <asp:TemplateField HeaderText="S/N" HeaderStyle-Width="100">
                    <ItemTemplate>
                        <%# Container.DataItemIndex + 1 %>
                    </ItemTemplate>

<HeaderStyle Width="100px"></HeaderStyle>
                </asp:TemplateField>


                <asp:TemplateField HeaderStyle-Width="100" ShowHeader="False">
                <EditItemTemplate>
                    <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True" CommandName="Update" Text="Update"></asp:LinkButton>
                    &nbsp;<asp:LinkButton ID="LinkButton3" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel"></asp:LinkButton>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Edit" Text="Edit" CssClass="glyphicon-edit"></asp:LinkButton>
                </ItemTemplate>
<HeaderStyle Width="100px"></HeaderStyle>
            </asp:TemplateField>

                <asp:TemplateField ShowHeader="false">
                <ItemTemplate>
            &nbsp;<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Delete" Text="Delete"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>

                <asp:BoundField DataField="ProjectID" HeaderText="ProjectID" InsertVisible="False" ReadOnly="True" SortExpression="ProjectID" />

                <asp:TemplateField ItemStyle-HorizontalAlign="Left" HeaderText="Project Title" SortExpression="ProjectTitle">
                    <EditItemTemplate>
                       <asp:TextBox ID="projectT" runat="server" Text='<%#Bind("ProjectTitle")%>' Height="48px" TextMode="MultiLine" Width="735px"></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="ProjectTitle" runat="server" Text='<%#Bind("ProjectTitle") %>'>
                        </asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>

                <asp:BoundField DataField="StartDate" ItemStyle-HorizontalAlign="Left" HeaderText="StartDate" DataFormatString="{0:dd/MM/yyyy}" HtmlEncode="false" SortExpression="StartDate" >
<ItemStyle HorizontalAlign="Left"></ItemStyle>
                 </asp:BoundField>
                <asp:BoundField DataField="EndDate" ItemStyle-HorizontalAlign="Left" HeaderText="EndDate" DataFormatString="{0:dd/MM/yyyy}" HtmlEncode="false" SortExpression="EndDate" >
<ItemStyle HorizontalAlign="Left"></ItemStyle>
                 </asp:BoundField>
                <asp:BoundField DataField="Duration" ItemStyle-HorizontalAlign="Left" HeaderText="Duration" SortExpression="Duration" >
<ItemStyle HorizontalAlign="Left"></ItemStyle>
                 </asp:BoundField>
                <asp:BoundField DataField="ProjectCost" ItemStyle-HorizontalAlign="Left" HeaderText="ProjectCost" HtmlEncode="False" DataFormatString="{0:N}" SortExpression="ProjectCost" >
<ItemStyle HorizontalAlign="Left"></ItemStyle>
                 </asp:BoundField>
                <asp:BoundField DataField="Currency" ItemStyle-HorizontalAlign="Left" HeaderText="Currency" SortExpression="Currency" >
<ItemStyle HorizontalAlign="Left"></ItemStyle>
                 </asp:BoundField>
                <asp:BoundField DataField="PercentageOfCompletion" ItemStyle-HorizontalAlign="Left" HeaderText="% of Completion" HtmlEncode="False" DataFormatString="{0:P}" SortExpression="PercentageOfCompletion" >
<ItemStyle HorizontalAlign="Left"></ItemStyle>
                 </asp:BoundField>
                <asp:BoundField DataField="PhaseType" ItemStyle-HorizontalAlign="Left" HeaderText="PhaseType" SortExpression="PhaseType" >

<ItemStyle HorizontalAlign="Left"></ItemStyle>
                 </asp:BoundField>

                <asp:TemplateField HeaderText="Type" SortExpression="Type">
                    <ItemTemplate>
                        <asp:Label ID="Type" runat="server" Text='<%# Bind("Type") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="ProjectTypeID" runat="server" SelectedValue='<%# Bind("ProjectTypeID") %>' DataTextField="Type" DataValueField="ProjectTypeID" DataSourceID="SqlDataSource2"></asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>



                         <asp:TemplateField HeaderText="State" SortExpression="StateName">
                    <ItemTemplate>
                        <asp:Label ID="StateName" runat="server" Text='<%# Bind("StateName") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="StateID" runat="server" SelectedValue='<%# Bind("StateID") %>' DataTextField="StateName" DataValueField="StateID" DataSourceID="SqlDataSource3"></asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>


                <asp:TemplateField HeaderText="LGA" SortExpression="LGName">
                    <ItemTemplate>
                        <asp:Label ID="LGName" runat="server" Text='<%# Bind("LGName") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="LGAID" runat="server" SelectedValue='<%# Bind("LGAID") %>' DataTextField="LGName" DataValueField="LGAID" DataSourceID="SqlDataSource4"></asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>


                        <asp:TemplateField HeaderText="Community" SortExpression="CommunityName">
                    <ItemTemplate>
                        <asp:Label ID="CommunityName" runat="server" Text='<%# Bind("CommunityName") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="CommunityID" runat="server" SelectedValue='<%# Bind("CommunityID") %>' DataTextField="CommunityName" DataValueField="CommunityID" DataSourceID="SqlDataSource5"></asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>


                <asp:TemplateField HeaderText="Company" SortExpression="CompanyName">
                    <ItemTemplate>
                        <asp:Label ID="CompanyName" runat="server" Text='<%# Bind("CompanyName") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="CoyID" runat="server" SelectedValue='<%# Bind("CoyID") %>' DataTextField="CompanyName" DataValueField="CoyID" DataSourceID="SqlDataSource6"></asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>


                         <asp:TemplateField HeaderText="Contractor" SortExpression="Company">
                    <ItemTemplate>
                        <asp:Label ID="Company" runat="server" Text='<%# Bind("Company") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="ContractorID" runat="server" SelectedValue='<%# Bind("ContractorID") %>' DataTextField="Company" DataValueField="ContractorID" DataSourceID="SqlDataSource7"></asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>


                <asp:TemplateField HeaderText="Status" SortExpression="Status">
                    <ItemTemplate>
                        <asp:Label ID="Status" runat="server" Text='<%# Bind("Status") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="ProjectStatusID" runat="server" SelectedValue='<%# Bind("ProjectStatusID") %>' DataTextField="Status" DataValueField="ProjectStatusID" DataSourceID="SqlDataSource8"></asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>


                <asp:TemplateField HeaderText="Year" SortExpression="Year">
                    <ItemTemplate>
                        <asp:Label ID="Year" runat="server" Text='<%# Bind("Year") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:DropDownList ID="YearID" runat="server" SelectedValue='<%# Bind("YearID") %>' DataTextField="Year" DataValueField="YearID" DataSourceID="SqlDataSource9"></asp:DropDownList>
                    </EditItemTemplate>
                </asp:TemplateField>

                 <asp:BoundField DataField="ProjectExistence" ItemStyle-HorizontalAlign="Left" HeaderText="Proj Existence" SortExpression="ProjectExistence" >


<ItemStyle HorizontalAlign="Left"></ItemStyle>
                 </asp:BoundField>

                <asp:TemplateField ItemStyle-HorizontalAlign="Left" HeaderText="Project Relevance" SortExpression="ProjectRelevance">
                    <EditItemTemplate>
                       <asp:TextBox ID="projectrelevance" runat="server" Text='<%#Bind("ProjectRelevance")%>' Height="204px" TextMode="MultiLine" Width="735px"></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="ProjectRelevance" runat="server" Text='<%#Bind("ProjectRelevance") %>'>
                        </asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>


                <asp:TemplateField ItemStyle-HorizontalAlign="Left" HeaderText="Remarks" SortExpression="Remarks">
                    <EditItemTemplate>
                       <asp:TextBox ID="remark" runat="server" Text='<%#Bind("Remarks")%>' Height="204px" TextMode="MultiLine" Width="735px"></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="remark01" runat="server" Text='<%#Bind("Remarks") %>'>
                        </asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>

                <asp:TemplateField HeaderText="CountDown">
                    <ItemTemplate>
                        <div id="myCountdownClass"><%# !string.IsNullOrEmpty(Eval("EndDate").ToString()) ? Convert.ToDateTime(Eval("EndDate")).ToString("MM'/'dd'/'yyyy") : "" %></div>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>

这是我的剧本：

<script>
        // Set the date we're counting down to
        var countDownDate = new Date("Oct 5, 2017 15:37:25").getTime();

        // Update the count down every 1 second
        var x = setInterval(function () {

            // Get todays date and time
            var now = new Date().getTime();

            // Find the distance between now an the count down date
            var distance = countDownDate - now;

            // Time calculations for days, hours, minutes and seconds
            var days = Math.floor(distance / (1000 * 60 * 60 * 24));
            var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
            var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
            var seconds = Math.floor((distance % (1000 * 60)) / 1000);

            // Display the result in the element with id="demo"
            document.getElementById("myCountdownClass").innerHTML = days + "d " + hours + "h "
            + minutes + "m " + seconds + "s ";

            // If the count down is finished, write some text 
            if (distance < 0) {
                clearInterval(x);
                document.getElementById("myCountdownClass").innerHTML = "PROJECT ENDED";
            }
        }, 1000);

    </script>

//确定我们倒计时的日期
var countDownDate=新日期（“2017年10月5日15:37:25”）.getTime（）；
//每1秒更新一次倒计时
var x=设置间隔（函数（）{
//获取今天的日期和时间
var now=new Date（）.getTime（）；
//找出现在和倒计时日期之间的距离
var距离=倒计时日期-现在；
//天、小时、分钟和秒的时间计算
变量天数=数学楼层（距离/（1000*60*60*24））；
可变小时数=数学楼层（（距离%（1000*60*60*24））/（1000*60*60））；
var分钟=数学楼层（（距离%（1000*60*60））/（1000*60））；
var秒=数学楼层（（距离%（1000*60））/1000）；
//使用id=“demo”在元素中显示结果
document.getElementById（“myCountdownClass”）.innerHTML=days+“d”+hours+“h”
+分钟+米+秒+秒；
//如果倒计时结束，写一些文字
如果（距离<0）{
净间隔（x）；
document.getElementById（“myCountdownClass”）.innerHTML=“项目结束”；
}
}, 1000);

下面是如何在GridView中创建倒计时计时器的快速演示。使用

TemplateField

并将正确的日期放置在div中。向该div添加一个类，以便在jQuery中引用它

<asp:TemplateField>
    <ItemTemplate>
        <div class="myCountdownClass"><%# Convert.ToDateTime(Eval("myDate")).ToString("MM'/'dd'/'yyyy") %></div>
    </ItemTemplate>
</asp:TemplateField>

更新2

<script type="text/javascript" src="/jquery.countdown.min.js"></script>

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <div class="myCountdownClass"><%# Convert.ToDateTime(Eval("myDate")).ToString("MM'/'dd'/'yyyy") %></div>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <%# Convert.ToDateTime(Eval("myDate")).ToString("MM'/'dd'/'yyyy") %>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

<script type="text/javascript">
    $('.myCountdownClass').each(function () {
        var date = $(this).text();
        $(this).countdown(date, function (event) {
            $(this).text(event.strftime('%D days %H:%M:%S'));
        });
    });
</script>

这里是一个如何在GridView中创建倒计时计时器的快速演示。使用
TemplateField
并将正确的日期放置在div中。向该div添加一个类，以便在jQuery中引用它

<asp:TemplateField>
    <ItemTemplate>
        <div class="myCountdownClass"><%# Convert.ToDateTime(Eval("myDate")).ToString("MM'/'dd'/'yyyy") %></div>
    </ItemTemplate>
</asp:TemplateField>

更新2

<script type="text/javascript" src="/jquery.countdown.min.js"></script>

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <div class="myCountdownClass"><%# Convert.ToDateTime(Eval("myDate")).ToString("MM'/'dd'/'yyyy") %></div>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <%# Convert.ToDateTime(Eval("myDate")).ToString("MM'/'dd'/'yyyy") %>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

<script type="text/javascript">
    $('.myCountdownClass').each(function () {
        var date = $(this).text();
        $(this).countdown(date, function (event) {
            $(this).text(event.strftime('%D days %H:%M:%S'));
        });
    });
</script>


如果我是你，我会开始寻找jQuery倒计时计时器。每秒刷新整个页面以显示倒计时是一个巨大的服务器负载。@VDWWD谢谢。现在使用jquery倒计时。如何从sql数据库自动获取日期。如果我是你，我会开始寻找jQuery倒计时计时器。每秒刷新整个页面以显示倒计时是一个巨大的服务器负载。@VDWWD谢谢。现在使用jquery倒计时。如何从sql数据库中自动获取日期。非常感谢。我面临这个挑战，我的数据库中的一些结束日期列为空。因此，我收到此错误消息“对象无法从DBNull转换为其他类型”。我如何设置条件以绕过该条件，并为数据库中“结束日期”列中有日期的对象提供倒计时。更新了我的答案。感谢您的即时回答。我很感激。我的gridview现在正在显示。但是倒计时列显示的是结束日期，而不是倒计时计时器的显示和滴答声