JSONListModel

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JSONListModel is a pure-QML component that allows using JSON data as datasource for a QML ListView.

See QJsonModel for a pure Qt/C++ class based on QAbstractItemModel.

Code

The JSONListModel code is Open Source and available under the MIT license at:

github.com/kromain/qml-utils

Features

  • mimics the XMLListModel component by providing similar API and properties
  • supports both source-based and string-based JSON data
  • support complex JSON documents and queries via JSONPath (XPath for JSON)

Example

With a file jsonData.txt containing:

{ "store": {
    "book": [
      { "category": "reference",
        "author": "Nigel Rees",
        "title": "Sayings of the Century",
        "price": 8.95
      },
      { "category": "fiction",
        "author": "Evelyn Waugh",
        "title": "Sword of Honour",
        "price": 12.99
      },
      { "category": "fiction",
        "author": "Herman Melville",
        "title": "Moby Dick",
        "isbn": "0-553-21311-3",
        "price": 8.99
      },
      { "category": "fiction",
        "author": "J. R. R. Tolkien",
        "title": "The Lord of the Rings",
        "isbn": "0-395-19395-8",
        "price": 22.99
      }
    ],
    "bicycle": {
        "color": "red",
        "price": 19.95
    }
  }
}

We can write:

    JSONListModel {
        id: jsonModel1
        source: "jsonData.txt"
        // All books in the store object
        query: "$.store.book[*]"
    }

    JSONListModel {
        id: jsonModel2
        source: "jsonData.txt"
        // Books less than $10
        query: "$..book[?(@.price<10)]"
    }

    JSONListModel {
        id: jsonModel3
        json: '[ \  
            {"label": "Answer", "value": "42"}, \
            {"label": "Pastis", "value": "51"}, \
            {"label": "Alsace", "value": "67"}, \
            {"label": "Alsace", "value": "68"} \
        ]'
        // Labels starting with 'A'
        query: "$[?(@.label.charAt(0)==='A')]"
    }

And use it in views and delegates like this:

    ListView {
        model: jsonModel1.model

        delegate: Component {
            Text {
                // Can be any of the JSON properties: model.author, model.price, etc.
                text: model.title
            }
        }