Question

我的代码目前要求我点击按钮将信息发回服务器，有没有办法用代码自动执行此操作，基本上是模拟点击按钮或更好，没有任何按钮后发回来？

ASPX代码：

           <%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="WebApplication3.WebForm1" %>

                <%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>

                <!DOCTYPE html>


                  <form id="form1" runat="server">
                      <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
                          <Scripts>
                              <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js">
                              </asp:ScriptReference>
                              <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js">
                              </asp:ScriptReference>
                              <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js">
                              </asp:ScriptReference>
                          </Scripts>
                      </telerik:RadScriptManager>


                  <asp:HiddenField runat="server" ID="svgHolder" />
    <asp:Button ID="Button1" Text="Export the RadHtmlChart" OnClientClick="getSvgContent(this);"
            runat="server" />
    <table class="clearTable2" style="page-break-after: avoid;">
        <tr>
            <td class="clearTable1"></td>
            <td class="clearTable2">
                <asp:Label ID="lblSectionTitle" runat="server" CssClass="label2"></asp:Label>
            </td>
            <td class="clearTable1"></td>
        </tr>
    </table>
    <table class="clearTable2">
        <tr>
            <td class="clearTable1"></td>
            <td class="clearTable1" style="width: 100%; visibility: visible">

                <telerik:RadHtmlChart runat="server" ID="RadHtmlChart1">
                    <Legend>
                        <Appearance Position="Bottom">
                            <TextStyle FontSize="14" Color="Blue" FontFamily="Courier New, sans-serif" />
                        </Appearance>
                    </Legend>
                    <PlotArea>
                        <XAxis>
                            <Items>
                                <telerik:AxisItem LabelText="KM41872"/>
                                <telerik:AxisItem LabelText="KM41873"/>
                                <telerik:AxisItem LabelText="KM41871"/>
                            </Items>
                            <MajorGridLines Visible="false" />
                            <MinorGridLines Visible="false" />
                        </XAxis>
                        <YAxis>
                            <MinorGridLines Visible="false" />
                        </YAxis>
                        <Series>
                            <telerik:LineSeries Name="Mean">
                                <SeriesItems>
                                    <telerik:CategorySeriesItem Y="0.59" />
                                    <telerik:CategorySeriesItem Y="0.63" />
                                    <telerik:CategorySeriesItem Y="0.6" />
                                    <telerik:CategorySeriesItem Y="0.65" />
                                    <telerik:CategorySeriesItem Y="0.64" />
                                    <telerik:CategorySeriesItem Y="0.63" />
                                    <telerik:CategorySeriesItem Y="0.65" />
                                    <telerik:CategorySeriesItem Y="0.67" />
                                    <telerik:CategorySeriesItem Y="0.63" />
                                </SeriesItems>
                            </telerik:LineSeries>
                            <telerik:LineSeries Name="Min">
                                <SeriesItems>
                                    <telerik:CategorySeriesItem Y="0.55" />
                                    <telerik:CategorySeriesItem Y="0.56" />
                                    <telerik:CategorySeriesItem Y="0.55" />
                                    <telerik:CategorySeriesItem Y="0.61" />
                                    <telerik:CategorySeriesItem Y="0.56" />
                                    <telerik:CategorySeriesItem Y="0.57" />
                                    <telerik:CategorySeriesItem Y="0.59" />
                                    <telerik:CategorySeriesItem Y="0.61" />
                                    <telerik:CategorySeriesItem Y="0.55" />
                                </SeriesItems>
                            </telerik:LineSeries>
                            <telerik:LineSeries Name="Max">
                                <SeriesItems>
                                    <telerik:CategorySeriesItem Y="0.66" />
                                    <telerik:CategorySeriesItem Y="0.74" />
                                    <telerik:CategorySeriesItem Y="0.66" />
                                    <telerik:CategorySeriesItem Y="0.71" />
                                    <telerik:CategorySeriesItem Y="0.72" />
                                    <telerik:CategorySeriesItem Y="0.73" />
                                    <telerik:CategorySeriesItem Y="0.71" />
                                    <telerik:CategorySeriesItem Y="0.74" />
                                    <telerik:CategorySeriesItem Y="0.71" />
                                </SeriesItems>
                            </telerik:LineSeries>
                        </Series>
                    </PlotArea>
                </telerik:RadHtmlChart>
            </td>
            <td class="clearTable1"></td>
        </tr>
    </table>
    <script type="text/javascript">
        function getSvgContent(sender) {
            //obtain an SVG version of the chart regardless of the browser
            var chartRendering = $find("<%=RadHtmlChart1.ClientID %>").getSVGString();
            //store the SVG string in a hidden field and escape it so that the value can be posted to the server
            document.getElementById('<%=svgHolder.ClientID%>').value = escape(chartRendering);
            //initiate the postback from the button so that its server-side handler is executed
            __doPostBack(sender.name, "");
            $('#Button1').click();
        }
    </script>
                      <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</form>

代码隐藏：公共类WebForm1 继承System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Button1.Text = HttpUtility.UrlDecode(svgHolder.Value)

End Sub


'Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'    Dim svgText As String = HttpUtility.UrlDecode(svgHolder.Value)
'End Sub
End Class

Answer 1

function DoPostBack(obj) {
            __doPostBack(obj.id, 'OtherParams');
}

Just call __doPostBack

Answer 2

你想要的是__dopostback javascript函数（google it）。它本质上是从.Net控件中伪造一个回发事件，因此它就像点击你的按钮一样工作。你也可以设置按钮的diplay：hidden属性，如果你不希望它显示但仍然挂钩进行回发。

在VB.NET中没有单击按钮的回发？

2 个答案: