Run XQuery dynamically in JavaScript and store the outcome in a JavaScript variable

Looking to achieve the following:

Running a dynamic XQUERY stored in a JavaScript variable example

var myxquery = For Channels.Channel

where Channel/availability = yes

And Channels.Channel/Label = 'CNN'

Return  EXIST(Channels.Channel/Id)';

var xmltoparse= '<channel>
<available>yes</available>
<label>CNN</label>
</channel>
<channel>
<available>yes</available>
<label>BBC</label>
</channel>'

This involves executing the myxquery variable against the xmltoparse variable and saving the result of the XQUERY in another variable.

Is this achievable?

Answer №1

If you're interested in running XQuery on the client side, particularly in a web browser, you might want to explore the mxquery-based solution known as XQIB (XQuery In the Browser):

As far as I know, it allows for calling JavaScript functions from XQuery and vice versa.

If the concept of running XML standards on the client side intrigues you, consider looking into Saxon-CE:

Depending on your specific goals, utilizing XForms could also be beneficial. XForms enables you to maintain an (XML) data model within your webpage and implement various dynamic evaluations. One notable client-side implementation is XSLTForms:

Hope this helps!

Answer №2

A possible solution is to utilize the eval() function. However, it's crucial to be aware that this method can leave your webservice vulnerable to injection attacks, especially with this specific pattern making it quite simple for attackers. This is why experts generally advise against using it.

In the event that you have no other option but to proceed with this approach, one potential way to go about it would be to create an XQY endpoint capable of accepting a string as input and then passing that value to eval(). The precise method of invoking eval() may differ depending on the specific XQuery processor being used since it isn't standardized in the specification. For example, in eXist, you would use util:eval(), whereas in MarkLogic it would be xdmp:eval().

If you find yourself compelled to implement this particular pattern, it's absolutely essential to implement stringent security measures such as robust authentication protocols, restricting the privileges of the user executing the eval, and possibly even inspecting the input string before execution.

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