Null Pointer Micromanagement

    1.0.21 • Public • Published makes it easier working with data on maps

    This is one of the very first version of this npm package. Adding more functionality and removing the bugs occupy much time. So the documentation suffers a lot.

    Write your own map

    1. Create a HTML file template

    Create a new and empty HTML file. Copy the code below and get a blueprint of a simple website. The lines beginning with <!-- are placeholder for later use.

    <html lang="en" xmlns="">
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=7; IE=EmulateIE9; IE=10" />
        <!-- put in your app icon here -->
        <!-- put in the lib here -->
        <!-- put in the data here -->
        <!-- put in the map here -->
        <!-- put in the map pins here -->
        <!-- placeholder for Google, Facebook and Twitter -->

    Language setting, e.g. lang="de" for map attribution.

    <html lang="de" xmlns="">

    2. use the lib and choose a theme

    Replace ...

    <!-- put in the lib here -->
    <link rel="stylesheet" href="" />
    <script src=""></script>

    3. set a data source

    Replace ...

    <!-- put in the data here -->
    <meta name="ddj:data" content="path/to/data.csv">
    <meta name="ddj:dataType" content="csv">
    <meta name="ddj:dataUniqueIdentifier" content="id">

    dataType is one of

    • json (default)
    • geojson
    • csv
    • wfs (in planning)

    If you see CORS problems use

    <meta name="ddj:dataUseCorsProxy" content="">

    Additional ...

    <meta name="ddj:dataIgnoreSecondLine" content="false">
    <meta name="ddj:dataIgnoreLastLine" content="false">
    <meta name="ddj:dataNoCache" content="true">
    <meta name="ddj:dataDelimiter" content=",">
    <meta name="ddj:latitudeColumn" content="lat">
    <meta name="ddj:longitudeColumn" content="lng">

    Info ... CORS problems should be solved by 3rd party proxy

    4. setup the map

    Replace ...

    <!-- put in the map here -->
    <link rel="stylesheet" href="" />
    <script src=""></script>
    <meta name="ddj:mapCenter" content="52.527040, 13.338440"> <!-- center old city hall of Berlin-Mitte -->
    <meta name="ddj:mapZoom" content="13">
    <body class="m-0">
        <div data-map id="map"></div>

    openstreetmap style or mapbox style ...

    <meta name="ddj:mapboxToken" content="pk.eyJ1IjoidHVyc2ljcyIsImEiOiI1UWlEY3RNIn0.U9sg8F_23xWXLn4QdfZeqg">

    4b. attribute

    Replace ...

    <body class="m-0">
        <div data-map id="map">
            <div data-map="attribution">
                <a href="" title="" target="_blank"></a>

    5. show map pins

    Replace ...

    • white
    • red
    • darkred
    • lightred
    • orange
    • beige
    • green
    • darkgreen
    • lightgreen
    • blue
    • darkblue
    • lightblue
    • purple
    • darkpurple
    • pink
    • cadetblue
    • gray
    • lightgray
    • black

    Font Awesome 5.x register for free...

    <!-- put in the map pins here -->
    <link rel="stylesheet" href="" />
    <script src=""></script>
    <script src="" crossorigin="anonymous"></script>
    <meta name="ddj:pinColor" content="cadetblue">
    <meta name="ddj:pinIconPrefix" content="fas">
    <meta name="ddj:pinIcon" content="fa-certificate">
    <meta name="ddj:pinColorColumn" content="pin-color">
    <meta name="ddj:pinIconPrefixColumn" content="pin-icon-prefix">
    <meta name="ddj:pinIconColumn" content="pin-icon">
    <meta name="ddj:borderColor" content="darkred">
    <meta name="ddj:borderWeight" content="1">
    <meta name="ddj:fillColor" content="red">
    <meta name="ddj:fillOpacity" content=".25">
    <meta name="ddj:invertPolygons" content="true">
    <meta name="ddj:borderColorColumn" content="border-color">
    <meta name="ddj:borderWeightColumn" content="border-weight">
    <meta name="ddj:fillColorColumn" content="fill-color">
    <meta name="ddj:fillOpacityColumn" content="fill-opacity">

    x. setup libs

    <link rel="stylesheet" href="" />
    <script src=""></script>
    <script src=""></script>
    <script src="index.js"></script>
    <script src=""></script>

    x. other configuration

    dataShareURI = tools.getMetaContent('ddj:shareURI')
    searchTitleColumn = tools.getMetaContent('ddj:searchTitleColumn') || '',
    searchDescriptionColumn = tools.getMetaContent('ddj:searchDescriptionColumn') || '',
    <link rel="stylesheet" href="" />
    <script src=""></script>

    x. save parameter in url

    <a href="#" data-key="city" data-value="Berlin">Berlin</a>
    ddj.autostart.onInitURL(function(obj) {
    ddj.autostart.onKeyValueLinkClicked(function(key, value) {
        console.log(key, value);
    ddj.url.replace({city: 'Berlin'});
    ddj.url.push({city: 'Berlin'});

    x. prepare for Google, Facebook and Twitter

    Replace ...

    <meta name="author" content="My name" />
    <meta name="keywords" content="comma,separated,list,of,keywords" />
    <meta name="robots" content="index,follow" />
    <title>Website title</title>
    <meta property="og:title" content="Website title" />
    <meta name="description" content="Website description" />
    <meta property="og:description" content="Website description" />
    <link rel="image_src" type="image/png" href="http://path/to/website/assets/social.png" />
    <meta property="og:image" content="http://path/to/website/assets/social.png" />
    <meta property="og:url" content="http://path/to/website/">
    <meta property="og:type" content="article" />
    <meta name="twitter:card" content="summary">
    <meta name="twitter:site" content="@twitter_handle">
    <meta name="twitter:creator" content="@twitter_handle">
    <!-- put in your app icon here -->
    <link rel="apple-touch-icon" sizes="57x57" href="/apple-icon-57x57.png">
    <link rel="apple-touch-icon" sizes="60x60" href="/apple-icon-60x60.png">
    <link rel="apple-touch-icon" sizes="72x72" href="/apple-icon-72x72.png">
    <link rel="apple-touch-icon" sizes="76x76" href="/apple-icon-76x76.png">
    <link rel="apple-touch-icon" sizes="114x114" href="/apple-icon-114x114.png">
    <link rel="apple-touch-icon" sizes="120x120" href="/apple-icon-120x120.png">
    <link rel="apple-touch-icon" sizes="144x144" href="/apple-icon-144x144.png">
    <link rel="apple-touch-icon" sizes="152x152" href="/apple-icon-152x152.png">
    <link rel="apple-touch-icon" sizes="180x180" href="/apple-icon-180x180.png">
    <link rel="icon" type="image/png" sizes="192x192"  href="/android-icon-192x192.png">
    <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
    <link rel="icon" type="image/png" sizes="96x96" href="/favicon-96x96.png">
    <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
    <link rel="manifest" href="/manifest.json">
    <meta name="msapplication-TileColor" content="#ffffff">
    <meta name="msapplication-TileImage" content="/ms-icon-144x144.png">
    <meta name="theme-color" content="#ffffff">

    x. write a tutorial

    <div data-role="popup" data-tutorial="dialog" id="popupTutorial" data-theme="b" class="ui-corner-all">
        <div data-tutorial="page">
            text for page 1
        <div data-tutorial="page">
            text for page 2

    x. advanced - add some interaction

        ddj.autostart.onDone(function() {
        ddj.autostart.onAddMarker(function(marker, value) {
            marker.index = key;
            marker.count = valCount;
   = lat;
            marker.lng = lng;
            marker.color = 'blue';
            marker.opacity = 1;
            marker.clickable = 1;
            marker.iconPrefix = 'fa';
            marker.iconFace = 'fa-dot-circle-o';
            return true;
        // for geojson files...
        ddj.autostart.onAddMarker(function(marker, value) {
            marker.borderColor = '#088';
            marker.borderWeight = 1;
            marker.fillColor = '#8ff';
            marker.fillOpacity = .5;
            marker.dashArray = null;
            marker.dashOffset = null;
        ddj.autostart.onSelected(function(selectedItem) {

    To Do

    Include polyfill for

    Build your own package

    To build the package, use:

    npm run build

    To build the package and run a watcher, use:

    npm run watch

    To publish the package on

    • open package.json and increase the version number
    • increase the version number in this README file
    • increase the version number in sample/sample.js file
    • npm run release
    • fill in the credencials
    • push and tag the version in github



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