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kamome
Asked: 2020-03-24 08:29:44 +0800 CST 2020-03-24 08:29:44 +0800 CST

How to scrape a remote xml file?

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I want to get some data from a freely accessible XML file on a remote server.

These are AEMET Open Data files. The idea is to read the xml and extract some information. I want to do it using javascript, so that I can display this data obtained from the xml file on a website. As an example one of the files is;

http://www.aemet.es/xml/maritima/FQXX46MM.xml

I understand how to do it in Python; I create a variable with the content of the XML and then with BeautifulSoup or any other scrapper I read the DOM data from the xml. I have no idea how to get started in javascript. How do I read the remote xml? from there I think I understand how I can get the data of each label.

I have searched how to do it and everything I find seems to be oriented to Ajax, but I can't find how to do it by reading the remote xml directly.

javascript

1 Answers

  1. Best Answer

    You can specify the dataTypename of jQuery's $.ajax function as "xml"

    Example

    $("button").click(function(){
     
    $.get({
        url: "http://www.aemet.es/xml/maritima/FQXX46MM.xml",
        dataType: "xml"
    })
    .done(function(data) {
        // Has algo con la variable data
        alert(data);
    })
    .error(function(e){
        //Desafortunadamente el recurso XML al estar en otro dominio no permite ser obtenido por AJAX al no tener el header: "Access-Control-Allow-Origin"
        alert(e.statusText);
    });
})
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<button>Prueba ajax con xml</button>

    Unfortunately, as the comment indicates, the particular resource you are trying to access: http://www.aemet.es/xml/maritima/FQXX46MM.xml does not deliver the header in the response, "Access-Control-Allow-Origin"so the browser will block the request showing the following message (in Chrome):

    XMLHttpRequest cannot load http://www.aemet.es/xml/maritima/FQXX46MM.xml.
No 'Access-Control-Allow-Origin' header is present on the requested resource.
Origin 'null' is therefore not allowed access.

    So, at least that particular file won't be readable from JavaScript, unless that page lists the domain where your script is hosted as allowed.

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