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Tuesday, September 30, 2008

Custom DataSheet View Using ListNet ActiveX Control


Introduction -

SharePoint DataSheet Page is used for editing lists in multiple record grid format. DataSheet view uses ListNet control, which is an ActiveX control. This control is also works in conjunction with the ListViewWebPart class to provide users with a dataview for editing lists in Microsoft Windows SharePoint Services.

ListNet control is defined in the STSLIST.DLL file, a dynamic-link library (DLL) that is installed on the client during 2007 Office system setup in the Local_Drive:\Program Files\Microsoft Office\OFFICE12 directory.

Analyzing out-of-box 'Edit in DataGrid' Page -

On clicking on 'Edit in DataGrid', redirection to 'AllItems.aspx' (~site/{DocLib}Forms/AllItems.aspx?ShowInGrid=True&View={ViewGuid}) happens.

In summary, looking at the source of the page, it contains Script tag, which calls Javascript function, RenderActiveX. RenderActiveX has the object tag with class id={65BCBEE4-7728-41a0-97BE-14E1CAE36AAE}.

Parameters which are set on the page, to render the ActiveX are - ListName, ViewGuid, ListWeb. ListData, ViewSchema, ListSchema.

In summary, below is the script tag -
<SCRIPT>RenderActiveX("<OBJECT id='STSListControlWPQ2' name='STSListControlWPQ2' classid=CLSID:65BCBEE4-7728-41a0-97BE-14E1CAE36AAE PARAM NAME='ListName' VALUE='{ListID} PARAM NAME=ViewGuid VALUE={ViewID} PARAM NAME=ListWeb VALUE={WebUrl} PARAM NAME='ListData' VALUE={ListData} PARAM NAME=ViewSchema VALUE={ViewSchema} PARAM NAME='ListSchema' VALUE={ListSchema} PARAM NAME='ControlName' VALUE='STSListControlWPQ2' > </OBJECT>");</SCRIPT>

Custom Application Page using ListNet ActiveX Page -
Below is some of the code snippet used in the application page. Application Page is passed two query parameters ListId and WebId, to create dynamic view for the list in the web.


<script runat="server">
SPWeb web;
SPList list;
string ListData, ViewSchema, ListSchema;

protected override void OnLoad(EventArgs e)
{
//Reading ListId querstring parameter
Guid listGuid = new Guid(Request.QueryString.Get("ListId"));

//Reading WebId querstring paramter
Guid webGuid = new Guid(Request.QueryString.Get("WebId"));

SPSite site = SPContext.Current.Site;
web = site.OpenWeb(webGuid);
list = web.Lists[listGuid];

//Custom string functions, STSHtmlEncode & STSScriptEncode to encode the string
ListData = STSScriptEncode(STSHtmlEncode(list.Items.Xml));
ViewSchema = STSScriptEncode(STSHtmlEncode(list.DefaultView.SchemaXml));
ListSchema = STSScriptEncode(STSHtmlEncode(list.SchemaXml));

}
</script>

<asp:Content ContentPlaceHolderId="PlaceHolderMain" runat="server">
<SCRIPT>RenderActiveX("\u003cOBJECT id=\u0022STSListControlWPQ2\u0022 name=\u0022STSListControlWPQ2\u0022 classid=CLSID:65BCBEE4-7728-41a0-97BE-14E1CAE36AAE width=\u002299\u0025\u0022 tabindex=\u00221\u0022\u003e\u003cPARAM NAME=\u0022ListName\u0022 VALUE=\u0022{<%=list.ID.ToString()%>}\u0022\u003e\u003cPARAM NAME=\u0022ViewGuid\u0022 VALUE=\u0022{<%=list.DefaultView.ID.ToString()%>}\u0022\u003e\u003cPARAM NAME=\u0022ListWeb\u0022 VALUE=\u0022<%=web.Url%>\u002f_vti_bin\u0022\u003e\u003cPARAM NAME=\u0022ListData\u0022 VALUE=\u0022<%=ListData%>\u0022\u003e\u003cPARAM NAME=\u0022ViewSchema\u0022 VALUE=\u0022<%=ViewSchema%>\u0022\u003e\u003cPARAM NAME=\u0022ListSchema\u0022 VALUE=\u0022<%=ListSchema%>\u0022\u003e\u003cPARAM NAME=\u0022ControlName\u0022 VALUE=\u0022STSListControlWPQ2\u0022\u003e\u003cp class=ms-descriptiontext\u003eThe Datasheet view of this list cannot be displayed. Please wait while the page is redirected to Standard view. If your list does not appear in a few moments, \u003cA onclick=\u0022javascript:GCNavigateToNonGridPage\u0028\u0029; javascript:return false;\u0022 href=\u0022?ShowInGrid=False\u0022 target=_self\u003eopen the list in Standard view\u003c\u002fA\u003e\u003c\u002fp\u003e\u003c\u002fOBJECT\u003e");
</SCRIPT>

<asp:Content>

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