更改属性＆QUOT;默认值＆QUOT; ControlParameter＆QUOT;在asp.net＆QUOT的;使用JavaScript控制 [英] Change the property "DefaultValue" of the asp.net "ControlParameter" control with javascript

问题描述

我已经有关于如何做到这一点的想法，但我意识到，控制ControlParameter没有一个id属性（这是需要的JS）。有没有办法使用JavaScript来改变默认值属性，而不需要使用ID属性的不同的方式？

下面是JavaScript和asp.net code，我一直努力着：

JavaScript的：

 函数ChangePropertyValue（propertyName的，newpropertyValue）{
        VAR ControlParameter =的document.getElementById（propertyName的）
        ControlParameter.DefaultValue = newpropertyValue
    }
 

asp.net：

 ＆LT; ASP：按钮的ID =为btnTest=服务器文本=试一试的OnClick =ChangePropertyValue（??，17）/＆GT;        ＆LT; ASP：SqlDataSource的ID =SqlDataSource1=服务器
        的ConnectionString =下;％$的ConnectionStrings：DatabaseConnectionString1％＆gt;中
        的SelectCommand =SELECT [ID]，[ContentTitle]，[内容] FROM [表1] WHERE（[ID] = @Id）＆GT;
        ＆LT; SelectParameters＆GT;
            ＆LT; ASP：ControlParameter控件ID =ListView1的默认值=16NAME =ID
                属性名=的SelectedValueTYPE =的Int32/＆GT;
        ＆LT; / SelectParameters＆GT;
    ＆LT; / ASP：SqlDataSource的＆GT;
 

解决方案

您无法访问 ControlParameter 客户端。 ControlParameters 用于控件属性服务器端的值绑定，他们不会呈现到客户端。你可以，但是，设置的默认值 ControlParameter 编程在code的后面。

  SqlDataSource1.SelectParameters [身份证] =默认值值。
 

I already have an idea on how to do this, but I realized that the control "ControlParameter" did not have an "Id" property (which is needed for the JS). Is there a different way to use JavaScript to change the "DefaultValue" property without the need of using the "Id" property?

Here is the JavaScript and asp.net code that I have been working with:

JavaScript:

        function ChangePropertyValue(propertyName, newpropertyValue) {
        var ControlParameter = document.getElementById(propertyName)
        ControlParameter.DefaultValue = newpropertyValue
    }

asp.net:

        <asp:Button ID="btntest" runat="server" Text="try" OnClick="ChangePropertyValue(??, 17)"/>

        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:DatabaseConnectionString1 %>" 
        SelectCommand="SELECT [Id], [ContentTitle], [Content] FROM [Table1] WHERE ([Id] = @Id)">
        <SelectParameters>
            <asp:ControlParameter ControlID="ListView1" DefaultValue="16" Name="Id" 
                PropertyName="SelectedValue" Type="Int32"/>
        </SelectParameters>
    </asp:SqlDataSource>

解决方案

You can't access a ControlParameter client side. ControlParameters are used to bind the value of a Control property server side, they are not rendered to the client. You can, however, set the Default value of the ControlParameter programmatically in your Code Behind.

SqlDataSource1.SelectParameters["id"].DefaultValue = "value";

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