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Filtering an XML file by product name, displaying results in a datalist

Posted on 2013-12-01
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Last Modified: 2013-12-04
I am working in ASP.Net (vb) with a client's XML file (reduced from 319 entries to 3):

 
<?xml version= "1.0"?>
<products>
	<product id="001">
		<division>Division1</division>
		<name>AName</name>
		<model>Model1</model>
		<category></category>
		<datathumbURL>image.jpg</datathumbURL>
		<datasheetURL>document.pdf</datasheetURL>
		<thumbURL>image.png</thumbURL>
		<fullImageURL></fullImageURL>
		<description>Many, many words here</description>
		<contactSnail>address, city, state, zip</contactSnail>
		<contactDigits>phone</contactDigits>
		<contactWebsite>URL</contactWebsite>
	</product>
	<product id="002">
		<division>Division2</division>
		<name>BName</name>
		<model>Model2</model>
		<category></category>
		<datathumbURL>image.jpg</datathumbURL>
		<datasheetURL>document.pdf</datasheetURL>
		<thumbURL>image.png</thumbURL>
		<fullImageURL></fullImageURL>
		<description>many, many words here</description>
		<contactSnail>address, city, state, zip</contactSnail>
		<contactDigits>phone</contactDigits>
		<contactWebsite>URL</contactWebsite>
	</product>
	<product id="003">
		<division>Division3</division>
		<name>CName</name>
		<model>Model3</model>
		<category></category>
		<datathumbURL>image.jpg</datathumbURL>
		<datasheetURL>document.pdf</datasheetURL>
		<thumbURL>image.png</thumbURL>
		<fullImageURL></fullImageURL>
		<description>man, many words here</description>
		<contactSnail>address, city, state, zip</contactSnail>
		<contactDigits>phone</contactDigits>
		<contactWebsite>URL</contactWebsite>
	</product>
</products>

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... and have created the sort and display code which works as expected (sorting the list of 319 products by name, division or model):

<script runat="server">
	Sub Page_Load

		dim dsProducts = New DataSet
		dsProducts.ReadXml(MapPath("products.xml"))
		
		Dim sid As String
		sid = Request.QueryString("sid")	
			
		If String.IsNullOrEmpty(Request.QueryString("sid")) Then
			dsProducts.Tables(0).DefaultView.Sort = "name, division, model ASC"			
		Elseif sid = "div" Then
			dsProducts.Tables(0).DefaultView.Sort = "division, name, model ASC"
		Elseif sid = "mod" Then
			dsProducts.Tables(0).DefaultView.Sort = "model, name, division ASC"	
		End If
	
		Dim dsProductsSort = dsProducts.Tables(0).DefaultView.ToTable()
		dlProducts.DataSource = dsProductsSort
		dlProducts.DataBind()
	End sub
</script>

<asp:DataList id="dlProducts" runat="server">
	<ItemTemplate>
		<a href="products-details.aspx?id=<%#Container.DataItem("id")%>" style="color:blue"> <%#Container.DataItem("name")%> | <%#Container.DataItem("model")%></a> | <%#Container.DataItem("division")%> 
	</ItemTemplate>
</asp:DataList>

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The client would now like a page that will allow clicking on a letter of the alphabet (A - B - C, etc...) to see a list of product names beginning with that letter.  In the example XML code these are listed as AName, BName and CName.

Ideally, the results would be shown in the same datalist included above.

Easy enough to do using a database - I can't seem to wrap my ahead around making it work using an XML file as the datasource.  Shuffling fields in the XML file is an option if required.

Help?
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Question by:henryroark
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2 Comments
 
LVL 52

Accepted Solution

by:
Carl Tawn earned 2000 total points
ID: 39689492
You should be able to add a RowFilter to the view based on the letter selected:
Dim filterLetter As String = "A"

...

If String.IsNullOrEmpty(Request.QueryString("sid")) Then
    dsProducts.Tables(0).DefaultView.Sort = "name, division, model ASC"
    dsProducts.Tables(0).DefaultView.RowFilter = "name like '" & filterLetter & "%'"
    ...
End If

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0
 

Author Closing Comment

by:henryroark
ID: 39696268
Simple and perfect, thank you.  I had it in mind that it would be a complicated matter.  Knowing about .RowFilter opens up a lot of possibilities.
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