Utilizing OpenLayers3 to create a global JavaScript variable

What could be the reason for this code working?

function addMap() {
  var view = new ol.View({
    center: ol.proj.fromLonLat([29.5646, 44.1575]),
    zoom: 4
  });
  var map = new ol.Map({
    target: 'map',
    layers: [
      new ol.layer.Tile({
        source: new ol.source.OSM()
      })
    ],
    view: view
  });
}

...while this code is not functioning?

var view = new ol.View({
  center: ol.proj.fromLonLat([29.5646, 44.1575]),
  zoom: 4
});

function addMap() {
  var map = new ol.Map({
    target: 'map',
    layers: [
      new ol.layer.Tile({
        source: new ol.source.OSM()
      })
    ],
    view: view
  });
}

One might assume that a variable declared outside a function is global and accessible from anywhere in the script.

javascriptopenlayers-3

Answer №1

One common issue is executing JavaScript code before the document has fully loaded.

  1. To tackle this problem, make sure to move your JavaScript code to the end of the body section.

  2. Alternatively, you can also use the following approach:

    $(document).ready(function() {
var view = new ol.View({
center: ol.proj.fromLonLat([29.5646, 44.1575]),
zoom: 4
}

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