Yahoo Weather Feed

[StewartS]

Hi there, I'm looking to display the Yahoo Weather feed on my website
(http://developer.yahoo.com/weather/). I am using Visual Web Developer
2005.

Everything works fine while parsing normal lines in the feed like this
(on the aspx page):

<aspataList ID="DataList1" runat="server"
DataSourceID="XmlDataSourceEd" Width="523px">
<ItemTemplate>
<%#XPath("title")%><br />
<%#XPath("description")%><br />
<%#XPath("lastBuildDate")%>
</ItemTemplate>
</aspataList>

But how would I get the <yweather> data (with its attributes) to be
displayed, i.e. from the following XML file:
http://xml.weather.yahoo.com/forecastrss?p=UKXX0052&u=c

Using XPath, as above, does not work for <yweather> and I'm not sure
how this is done!

Best Regards,
Stewart.

 

[Andy Dingley]

Everything works fine while parsing normal lines in the feed like this
(on the aspx page):

<aspataList ID="DataList1" runat="server"
DataSourceID="XmlDataSourceEd" Width="523px">
<ItemTemplate>
<%#XPath("title")%><br />
<%#XPath("description")%><br />
<%#XPath("lastBuildDate")%>
</ItemTemplate>
</aspataList>

Personally I wouldn't touch this stuff with a bargepole. It's the old
DSO approach, re-hashed with XPath kludged onto it. It still sucks as
much as DSO ever did. You'll have a happier life (and up to 40%
hair-regrowth) if you switch to using XSLT instead.

But how would I get the <yweather> data (with its attributes) to be
displayed, i.e. from the following XML file:
http://xml.weather.yahoo.com/forecastrss?p=UKXX0052&u=c

yweather isn't an element, it's an XML namespace for some elements.
Easy enough with XPath, commonplace with XSLT and XPath, but I've no
idea how to do it in M$oft's ASP/XPath. It's probably easy, I just
don't know how. Try searching MSDN or the SDK help files and looking
for "XPath namespace"

 

[StewartS]

Thanks Andy,

I'm relatively new to all this (hence my simple approach to it!) It
should be fairly straightforward - what I'm trying to - which is to
display a weather summary from the Yahoo feed.

I will get round to learning more about XML/XSLT, it's just that I need
a quick solution to this. (I'm particularly interested in the
hair-regrowth programme!)

I'll have another search on the web on XPath. In the mean time, does
anyone know a quick fix for this?

Cheers,
Stewart.

 

[saratnathb]

DataSourceID="XmlDataSourceEd" Width="523px">
<ItemTemplate>
<%#XPath("//yweather:forecast/@day")%><br />
<%#XPath("//yweather:forecast/@date")%><br />
<%#XPath("//yweather:forecast/@low")%><br />
<%#XPath("//yweather:forecast/@high")%><br />
<%#XPath("//yweather:forecast/@text")%><br />
</ItemTemplate>
</aspataList>

(or)

DataSourceID="XmlDataSourceEd" Width="523px">
<ItemTemplate>
<%#XPath("yweather:forecast/@day")%><br />
<%#XPath("yweather:forecast/@date")%><br />
<%#XPath("yweather:forecast/@low")%><br />
<%#XPath("yweather:forecast/@high")%><br />
<%#XPath("yweather:forecast/@text")%><br />
</ItemTemplate>
</aspataList>

Not work.

Else try to use MSXML parser method and transform the input XML
document to strip out those yweather prefixes. Let me know if you need
XSLT to do that.

 

[Andy Dingley]

<%#XPath("yweather:forecast/@day")%><br />

If this is really the right way to do it, then it's no wonder why
M$oft's products so often make me despair 8-(

It's a namespace, not a simple text prefix!

 

[saratnathb]

ok... then it seems like this is not working.
Do then you need to transform the input xml feed and strip it of all
namspace prefixes.

Create save this XSLT as a file and apply it on the input weather feed
before you pass it to your program.

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xslutput method="xml" indent="no"/>

<xsl:template match="/|comment()|processing-instruction()">
<xsl:copy>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>

<xsl:template match="*">
<xsl:element name="{local-name()}">
<xsl:apply-templates select="@*|node()"/>
</xsl:element>
</xsl:template>

<xsl:template match="@*">
<xsl:attribute name="{local-name()}">
<xsl:value-of select="."/>
</xsl:attribute>
</xsl:template>
</xsl:stylesheet>

Source : http://www.tei-c.org.uk/wiki/index.php/Remove-Namespaces.xsl

Btw. - i am not a msft person. so i do not have much idea on the msft
api to do this.


Buddhiraju Saratnath
http://www.geocities.com/saratnathb

 

[Andy Dingley]

Do then you need to transform the input xml feed and strip it of all
namspace prefixes.

Namespaces are your friend, so use them, don't throw them away!

First of all though you'll need to register that namespace with the
processor (XSLT, or presumably DSO too) This is easy in XSLT, just use
a namespace on the <xsl:stylesheet> element. I don't know how you do it
for DSO, presumably there's an extra statement to use earlier on

 

[saratnathb]

Absolutely!

If you can declare the namespace in your DSO, do use it.
If it doesn't support namespaces, you might have to live with this
kludge!


Saratnath Buddhiraju

 

[Andy Dingley]

If you can declare the namespace in your DSO, do use it.

This suggests that you can't
http://www.hanselman.com/blog/aspnet20xmldatasourcesxpathdoesntsupportnamespaces.aspx

If it doesn't support namespaces, you might have to live with this
kludge!

There's no point at all in running it through an XSLT filter, just so
that you can then feed it to this ghastly old baggage from last
century. If you have to use XSLT, process it entirely with XSLT.

 

[saratnathb]

".... ghastly old baggage from last"

I like that description.