How to clear the specified overlay in Baidu map api

This article mainly shares with you a method of clearing the specified overlay (Overlay) based on Baidu Maps API. It has a good reference value and I hope it will be helpful to everyone. Let’s follow the editor to take a look, I hope it can help everyone.

Recently I am working on a project using the Baidu Map API. I need to display markers and polylines on the map at the same time, and the polylines need to be displayed or cleared based on clicks, so I encountered the problem of clearing the specified overlay. After various searches, I couldn't find a perfect solution. Through my own thinking, I found a way to solve this problem and posted it to share with everyone. Okay, let’s get to the point:

There are two methods for clearing overlays: map.removeOverlay() or map.clearOverlays(). The clearOverlays() method removes all overlays at once, and removeOverlay() removes them all at once. A designated overlay, obviously, I want to remove a class of Polyline overlays at a time, neither method works.

Baidu demo (http://developer.baidu.com/map/jsdemo.htm#c1_17) has an example of removeOverlay(), as follows:

function deletePoint(){
    var allOverlay = map.getOverlays();
    for (var i = 0; i < allOverlay.length -1; i++){
      if(allOverlay[i].getLabel().content == "我是id=1"){
        map.removeOverlay(allOverlay[i]);
        return false;
      }
    }
  }

is done by traversing all overlays Filter the overlays to be removed;

For a type of overlays to be removed; you can set restrictions when adding overlays;

The first step: when adding overlays, is it correct? The overlay setting disableMassClear() that needs to be removed is explained in the official website documentation as follows

disableMassClear()

none prohibits the overlay from being cleared in the map.clearOverlays method. (Added since 1.1)

I don’t need to remove markers here, so the settings are as follows:

marker.disableMassClear();

Step 2: Clear the overlays to be cleared. Here you need to clear all Polyline without clearing the markers, now you can directly use

map.clearOverlays();

This way you can easily clear all the Polylines and keep the markers;

Step 3: When you need to remove the markers later , you can use the enableMassClear() method to cancel the prohibition of clearing;

enableMassClear()

none allows the overlay to be cleared in the map.clearOverlays method. (Added since 1.1)

But each marker needs to be restored, so it needs to be traversed:

var allOverlay = map.getOverlays();
      for (var i = 0; i < allOverlay.length; i++) {
        allOverlay[i].enableMassClear();
      }

This restores the clearable operations of all overlays.

A simple three-step setup can efficiently operate the specified type of covering.

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