CODEWITHSUNDEEP
vectoropenlayerslimitlayer
gberg927
gberg927

Reputation: 1686

OpenLayers Vector Layer Maximum number of features

I was wondering if it is possible to limit the number of features you an draw on a vectorylayer. If I already have a polygon drawn, and go to draw another it will delete the first feature.

If not is it possible to add a listener to the vector layer, so that I can erase all features when clicking to draw?

Thanks!!!

Upvotes: 0

Views: 2391

Answers (2)

Mohamed
Mohamed

Reputation: 89

you can make a button and when you click on it, it will remove all the features in your vector layer :

map.layers[1].removeAllFeatures();

Here 1 is the id of my layer (my vector layer is the second one after an OSM layer)

Good Luck !

Upvotes: 0

igorti
igorti

Reputation: 3856

You can't set max number of features on Vector Layer, but it has a whole lot of events where you can inject your own logic. Here are available events:

"beforefeatureadded", "beforefeaturesadded",
"featureadded", "featuresadded", "beforefeatureremoved",
"beforefeaturesremoved", "featureremoved", "featuresremoved",
"beforefeatureselected", "featureselected", "featureunselected", 
"beforefeaturemodified", "featuremodified", "afterfeaturemodified",
"vertexmodified", "vertexremoved", "sketchstarted",
"sketchmodified", "sketchcomplete", "refresh"

You can use "beforefeatureadded" for instance:

your_vectror_layer.events.on({'beforefeatureadded': function(){
  //Remove first feature or whatever you want to do
}});

Upvotes: 1

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