AJAX DropDownList

Enrico Elizar Samuel

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4.63/5 (37 votes)

13 Jul 200510 min read

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Custom DropdownList that utilizes AJAX to populate its content and implements Observer pattern to participate in dependent dropdownlist chains.

<VisualStudioProject>
    <CSHARP
        ProjectType = "Web"
        ProductVersion = "7.10.3077"
        SchemaVersion = "2.0"
        ProjectGuid = "{18A959C7-58BB-4AC7-AC1A-4270F0D36C91}"
    >
        <Build>
            <Settings
                ApplicationIcon = ""
                AssemblyKeyContainerName = ""
                AssemblyName = "Demo"
                AssemblyOriginatorKeyFile = ""
                DefaultClientScript = "JScript"
                DefaultHTMLPageLayout = "Grid"
                DefaultTargetSchema = "IE50"
                DelaySign = "false"
                OutputType = "Library"
                PreBuildEvent = ""
                PostBuildEvent = ""
                RootNamespace = "Demo"
                RunPostBuildEvent = "OnBuildSuccess"
                StartupObject = ""
            >
                <Config
                    Name = "Debug"
                    AllowUnsafeBlocks = "false"
                    BaseAddress = "285212672"
                    CheckForOverflowUnderflow = "false"
                    ConfigurationOverrideFile = ""
                    DefineConstants = "DEBUG;TRACE"
                    DocumentationFile = ""
                    DebugSymbols = "true"
                    FileAlignment = "4096"
                    IncrementalBuild = "false"
                    NoStdLib = "false"
                    NoWarn = ""
                    Optimize = "false"
                    OutputPath = "bin\"
                    RegisterForComInterop = "false"
                    RemoveIntegerChecks = "false"
                    TreatWarningsAsErrors = "false"
                    WarningLevel = "4"
                />
                <Config
                    Name = "Release"
                    AllowUnsafeBlocks = "false"
                    BaseAddress = "285212672"
                    CheckForOverflowUnderflow = "false"
                    ConfigurationOverrideFile = ""
                    DefineConstants = "TRACE"
                    DocumentationFile = ""
                    DebugSymbols = "false"
                    FileAlignment = "4096"
                    IncrementalBuild = "false"
                    NoStdLib = "false"
                    NoWarn = ""
                    Optimize = "true"
                    OutputPath = "bin\"
                    RegisterForComInterop = "false"
                    RemoveIntegerChecks = "false"
                    TreatWarningsAsErrors = "false"
                    WarningLevel = "4"
                />
            </Settings>
            <References>
                <Reference
                    Name = "System"
                    AssemblyName = "System"
                    HintPath = "c:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.dll"
                />
                <Reference
                    Name = "System.Drawing"
                    AssemblyName = "System.Drawing"
                    HintPath = "c:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.Drawing.dll"
                />
                <Reference
                    Name = "System.Data"
                    AssemblyName = "System.Data"
                    HintPath = "c:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.Data.dll"
                />
                <Reference
                    Name = "System.Web"
                    AssemblyName = "System.Web"
                    HintPath = "c:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.Web.dll"
                />
                <Reference
                    Name = "System.XML"
                    AssemblyName = "System.Xml"
                    HintPath = "c:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.XML.dll"
                />
                <Reference
                    Name = "CustomControls"
                    Project = "{8293B8E9-C106-429D-923F-590D5BE0821F}"
                    Package = "{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}"
                />
            </References>
        </Build>
        <Files>
            <Include>
                <File
                    RelPath = "AssemblyInfo.cs"
                    SubType = "Code"
                    BuildAction = "Compile"
                />
                <File
                    RelPath = "Default.aspx"
                    BuildAction = "Content"
                />
                <File
                    RelPath = "Default.aspx.cs"
                    DependentUpon = "Default.aspx"
                    SubType = "ASPXCodeBehind"
                    BuildAction = "Compile"
                />
                <File
                    RelPath = "Default.aspx.resx"
                    DependentUpon = "Default.aspx.cs"
                    BuildAction = "EmbeddedResource"
                />
                <File
                    RelPath = "GetLookupData.aspx"
                    BuildAction = "Content"
                />
                <File
                    RelPath = "GetLookupData.aspx.cs"
                    DependentUpon = "GetLookupData.aspx"
                    SubType = "ASPXCodeBehind"
                    BuildAction = "Compile"
                />
                <File
                    RelPath = "GetLookupData.aspx.resx"
                    DependentUpon = "GetLookupData.aspx.cs"
                    BuildAction = "EmbeddedResource"
                />
                <File
                    RelPath = "Global.asax"
                    SubType = "Component"
                    BuildAction = "Content"
                />
                <File
                    RelPath = "Global.asax.cs"
                    DependentUpon = "Global.asax"
                    SubType = "Code"
                    BuildAction = "Compile"
                />
                <File
                    RelPath = "Global.asax.resx"
                    DependentUpon = "Global.asax.cs"
                    BuildAction = "EmbeddedResource"
                />
                <File
                    RelPath = "SourceScript.aspx"
                    BuildAction = "Content"
                />
                <File
                    RelPath = "SourceScript.aspx.cs"
                    DependentUpon = "SourceScript.aspx"
                    SubType = "ASPXCodeBehind"
                    BuildAction = "Compile"
                />
                <File
                    RelPath = "SourceScript.aspx.resx"
                    DependentUpon = "SourceScript.aspx.cs"
                    BuildAction = "EmbeddedResource"
                />
                <File
                    RelPath = "Web.config"
                    BuildAction = "Content"
                />
            </Include>
        </Files>
    </CSHARP>
</VisualStudioProject>

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Written By

Enrico Elizar Samuel

Web Developer

Singapore

Currently, he is in Singapore doing a contract work for a multinational company. During weekend, he is busy exploring Singapore with his lovely fiance to find the best food.

AJAX DropDownList

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