3.01

XML List Model (P1 | 2h)

Explanation of the contents of a topic page @ Topic reference page

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Objective: OBJECTIVE

J:While XML is something to be introduced, at least for the starters we probably won't need exercises for it.

Beginner

What is XML?

Intermediate

How do I add XML data to Quick models?

Expert

Omitted

XmlListModel

Qt Quick provides an easy and convenient way to construct models from XML data.

If we have XML file of the form

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
    ...
    <channel>
        <item>
            <title>A blog post</title>
            <pubDate>Sat, 07 Sep 2010 10:00:01 GMT</pubDate>
        </item>
        <item>
            <title>Another blog post</title>
            <pubDate>Sat, 07 Sep 2010 15:35:01 GMT</pubDate>
        </item>
    </channel>
</rss>

We can construct a model the following way:

import QtQuick 2.0
import QtQuick.XmlListModel 2.0

XmlListModel {
    id: xmlModel
    source: "http://www.mysite.com/feed.xml"
    query: "/rss/channel/item"

    XmlRole { name: "title"; query: "title/string()" }
    XmlRole { name: "pubDate"; query: "pubDate/string()" }
}

In source we define the location for the .xml file, which can be either local or remote address. The query value of "/rss/channel/item" specifies that the XmlListModel should generate a model item for each in the XML document.

The XmlRole objects define the model item attributes. Here, each model item will have title and pubDate attributes that match the title and pubDate values of its corresponding . (See XmlRole::query for more examples of valid XPath expressions for XmlRole.)

Using the generated models in ListView works as usual:

ListView {
    width: 180; height: 300
    model: xmlModel
    delegate: Text { text: title + ": " + pubDate }
}

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Course material content

Instructions and description for the exercise of the topic

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Exhaustive reference material mentioned in this topic

https://doc-snapshots.qt.io/qt5-5.9/qtquick-modelviewsdata-modelview.html#xml-model https://qmlbook.github.io/en/ch06/index.html#a-model-from-xml

Further reading topics/links: