Problem in remove interaction after draw end in openlayers-3

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I'm using OpenLayers-3.8.2. I have a draw Ineraction as follow:

function drawEnd(){ map.removeInteraction(drawIneraction).}var drawInteraction = new ol.interaction.Draw({ source: mysource, type: 'LineString'});drawInteraction.on('drawend', drawEnd);map.addInteraction(drawInteraction);I want to user draw just one feature. This Code work, but when user draw a feature, map zoom in 2 level.

How can I prevent zooming in?



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