当我在回调函数的第一行中断并执行此操作时
this.active --> true
this.deactivate() --> true
this.activate() --> true
this.deactivate() --> false
这怎么会发生？
让我解释一下这发生在哪里。
该地图有两个图层，每个图层都有一个与之关联的 EditingToolbar。
当用户按下多边形绘制（在 EditingToolbar 中）时，它被绘制在“polygon_layer”上。
当用户按下线画或点画时，图层被切换，用户现在在“矢量”图层上绘图。
当我切换图层时，我需要在 EditingToolbar 中激活正确的按钮，例如：
用户在“polygon_layer”中绘制多边形，现在他想绘制线条。他按下画线按钮（在与polygon_layer 关联的EditingToolbar 中）。
我切换图层并激活该图层的 EditingToolbar 上的画线按钮。
过了一会儿，用户现在想再次绘制多边形，所以我停用了该图层中的所有按钮，切换图层并激活多边形图层的 EditingToolbar 中的绘制多边形按钮。等等。
现在，当我这样做足够多次（3 个开关）时，我注意到按钮不再被停用。
所以我尝试调试并得到了上面描述的这个完全意外的错误（在最顶部）。
请告诉我我做错了什么。
我已经附加了我的代码，我将把它放在ERROR HERE发生这种情况的地方。此代码已准备好运行。您可以使用下面的 HTML 代码，只需更改对我提供的 JavaScript 文件的引用（我提供了 JavaScript 文件的内容）
JS FILE:
var map;
var editing_toolbar_polygon=null;
var editing_toolbar_vector=null;
var drag_control=null;
var vectors;
var polygon_layer=null;
var epsg900913 = new OpenLayers.Projection('EPSG:900913');
var epsg4326 = new OpenLayers.Projection('EPSG:4326');
//var epsg900913 = new OpenLayers.Projection('EPSG:900913');
// var epsg4326 = new OpenLayers.Projection('EPSG:4326');
var line_control;
var polygon_control;
var renderer;
function initialize() {
line_control, renderer=OpenLayers.Util.getParameters(window.location.href).renderer;
renderer= (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;
// Create the map object
map = new OpenLayers.Map('map');
//Create a Google layer
var gmap = new OpenLayers.Layer.Google(
"Google Streets", // the default
{
numZoomLevels: 20,
projection: new OpenLayers.Projection("EPSG:900913")
}
);
var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0?", {layers: 'basic',
projection: new OpenLayers.Projection("EPSG:4326")});
var mystyle=new OpenLayers.StyleMap({
"default": new OpenLayers.Style({
fillColor: "#66ccff",
strokeColor: "#3399ff",
graphicZIndex: 2,
strokeWidth: 5,
}),
"temporary": new OpenLayers.Style({
fillColor:"#3399ff",
strokeColor: "#3399ff",
strokeWidth:5,
pointRadius:10
})
});
polygon_layer=new OpenLayers.Layer.Vector(
"Polygon Layer",
{
//renderers:renderer,
}
);
vectors= new OpenLayers.Layer.Vector(
"Vector Layer",
{
//renderers:renderer,
}
);
editing_toolbar_polygon=new OpenLayers.Control.EditingToolbar(polygon_layer);
editing_toolbar_vector=new OpenLayers.Control.EditingToolbar(vectors);
map.addLayers([gmap,wms,vectors,polygon_layer]);
map.addControl(new OpenLayers.Control.LayerSwitcher());
//map.addControl(new OpenLayers.Control.MousePosition());
map.addControl(editing_toolbar_polygon);
map.addControl(editing_toolbar_vector);
editing_toolbar_vector.deactivate();
//for the drag control to work you need to activate it
drag_control=new OpenLayers.Control.DragFeature(vectors);
map.addControl(drag_control);
find_control(editing_toolbar_polygon.getControlsByClass(new RegExp(".*DrawFeature")),"Point").events.register("activate",null,function(e){
//ERROR HERE
this.deactivate();
var picked_button=find_same_control(editing_toolbar_vector.controls,e.object);
change_layer(polygon_layer,vectors);
change_control(editing_toolbar_polygon,editing_toolbar_vector);
picked_button.activate();
});
find_control(editing_toolbar_polygon.getControlsByClass(new RegExp(".*DrawFeature")),"Path").events.register("activate",null,function(e){
//ERROR HERE
this.deactivate();
var picked_button=find_same_control(editing_toolbar_vector.controls,e.object);
change_layer(polygon_layer,vectors);
change_control(editing_toolbar_polygon,editing_toolbar_vector);
picked_button.activate();
});
find_control(editing_toolbar_vector.getControlsByClass(new RegExp(".*DrawFeature")),"Polygon").events.register("activate",null,function(e){
//ERROR HERE
this.deactivate();
var picked_button=find_same_control(editing_toolbar_polygon.controls,e.object);
change_layer(vectors,polygon_layer);
change_control(editing_toolbar_vector,editing_toolbar_polygon);
picked_button.activate();
});
polygon_layer.events.register("beforefeatureadded",null,function(e){
polygon_layer.removeAllFeatures();
});
// line_control=new OpenLayers.Control.DrawFeature(vectors,OpenLayers.Handler.Path);
//polygon_control=new OpenLayers.Control.DrawFeature(vectors,OpenLayers.Handler.RegularPolygon);
//map.addControl(line_control);
//line_control.activate();
//map.addControl(polygon_control);
//polygon_control.activate();
// Zoom to Vancouver, BC
map.setCenter(new OpenLayers.LonLat(-123.12, 49.28).transform(epsg4326, epsg900913), 13);
}
function change_layer(current_layer,next_layer){
current_layer.setVisibility(false);
next_layer.setVisibility(true);
}
function change_control(current_control,next_control){
current_control.deactivate();
map.addControl(next_control);
}
//use this when you want to find a specific control type:
// DrawFeature cntrol has many types, Line, Polygon, Point.
// So what you do is pass an array of DrawFeature controls and a type(string), lets say "Point",
// then this function will return a DrawFeature thats specifically for drawing points
function find_control(controls,type){
var control;
for(var x in controls){
if(controls[x].displayClass.search(new RegExp(type+"$"))>0){
return controls[x];
}
}
return -1;
}