MediaWiki:Asset.js

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$(document).ready(function () {

    function f(name) {
        return $("[name='Asset[" + name + "]']");
    }

    function generate() {
        const ch = f("Chapter").val();
        const pl = f("Place").val();
        const org = f("Organisation").val();

        if (!ch || (pl && org) || (!pl && !org)) return;

        new mw.Api().get({
            action: "scribunto-console",
            title: "Module:AssetID",
            question:
                "return require('Module:AssetID').generate{" +
                "Chapter='" + ch + "'," +
                "Place='" + pl + "'," +
                "Organisation='" + org + "'}"
        }).done(function (data) {
            const r = JSON.parse(data.return);
            if (r.error) { alert(r.error); return; }

            f("Label").val(r.identifier);
            f("Sequence").val(r.sequence);
            $("input[name='pfFormPageName']").val(r.identifier);
        });
    }

    f("Chapter").change(generate);
    f("Place").change(generate);
    f("Organisation").change(generate);

    $("input[type='file']").on("change", function () {
        if (this.files[0]) {
            f("OriginalFilename").val(this.files[0].name);
        }
    });
});