JavaScript/jQuery Diagram - pageSize.items
An array that specifies the page size items in the Page Size combobox on Properties Panel.
jQuery
JavaScript
$(function() {
    $("#diagram").dxDiagram({
        viewUnits: "cm",
        units: "cm",
        pageSize: {
            width: 21,
            height: 29.7,
            items: [
                { text: "A4 (21cm x 29.7cm)", width: 21, height: 29.7 },{ text: "A3 (29.7cm x 42cm)", width: 29.7, height: 42 }
            ]
        },
    });
});
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