how to modify query string whose filter value contains &

I have constructed an URL like -

http://server_name/_vti_bin/owssvr.dll?Cmd=Display&List={List-Id}&XMLDATA=TRUE&View={View-Id}&Query=*&FilterField1=Country_x0020_Name&FilterValue1=UK & Ireland

which ofcourse doesnot give me the expected output. How to specify the filer value if there is an '&' character in the string? The filter value is retrieved from a sharepoint list that contai开发者_JS百科ns the list of countries

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You need to encode the value of the filter parameter according to RFC 3986. If you're building the url using javascript, then you would do this using a call to encodeURIComponent(rawData):

var url = hostpath + "?Query=" + encodeURIComponent(filterValue);

This will take care of '&', spaces and other characters that would otherwise cause a problem. If you're hard-coding the URL, then you can use one of the many public access tools to see what the encoded value should look like, e.g. W3Schools.com