[GIS] How to change overlays checkbox feature in layerlist to radio button

openlayers-2

How to change the default check box button of Overlays in Layerlist to radio buttons. My client doesn't want his users to see more than one layer on the map.

Is there any way that we can prevent the possibility to check multiple layers in overlay layers in the LayerList?

Best Answer

have you tried adding this option to your layers?

displayInLayerSwitcher: false

Here is my second answer. I have not tested it but I believe it will work.

In \Control\LayerSwitcher.js change the line, line 331 in what I am looking at, from:

    inputElem.type = (baseLayer) ? "radio" : "checkbox";

to:

    inputElem.type = (baseLayer) ? "checkbox" : "radio";

to see the change you will need to load the uncompressed OL code.

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[GIS] can I get map’s bounding box at any time, after user clicks button

I know this is old,

but I keep getting wrong information due to the breaking change of openlayer 2 to 3.

Openlayer 2 :

map.getExtent().toBBOX();
// return Simple String representation of bounds object.  (e.g.  “5,42,10,45”)

Openlayer 3 :

map.getView().calculateExtent(map.getSize())
// return an array of coordinate [-9352936.233159352, 4617690.331601141, -4837648.098297421, 6897348.263178239]

Openlayer3 has a really bad documentation. Googling for Ol api always refer you to an old version of the API. The API has key feature marked has "not stable". There is undocumented features such as calculateExtent and obviously, the breaking change from 2 to 3 makes OpenLayer, in my opinion, a pretty bad library.

Just before you start a new project with openlayer I suggest to anyone to consider using leaflet.js which is a pretty solid, usable and stable library with wonderful one-page documentation.

[GIS] How to see if a function is already registered to an event on an OpenLayers map

As an example, go to http://www.openlayers.org/dev/examples/click.html

Type in your console map.events.listeners to get a list of registered events classified by events types.

To see if you really added your event to the map, just count the type of events you registered.

A sample could be

console.log('Before adding a new click event', map.events.listeners.click.length);

function test() {
  console.log('ok');
}

map.events.register("click", map, test);

console.log('After adding a new click event', map.events.listeners.click.length);

You will the number go from 9 to 10 registered click events on the map

Best Answer

Related Solutions

[GIS] can I get map’s bounding box at any time, after user clicks button

[GIS] How to see if a function is already registered to an event on an OpenLayers map

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