以下代码示例让我感到困惑。这是我可以用来演示我的问题的更大代码的最简单版本。基本上我希望用户能够通过按住鼠标键并拖动它来绘制边界框。
如果我使用mouseMove函数中的setBounds重绘rectange,我从未看到mouseUp事件!如果我在mouseMove函数中禁用重绘矩形,我会得到mouseUp事件。我可以通过在mouseUp事件中绘制矩形来部分解决这个问题,但是当用户拖动框时用户无法看到轮廓。
您可以在http://www.geoffschultz.org/Test/bounding_box.html
中查看此代码示例以下是代码:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#mapdiv { height: 100% }
</style>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
var map, mouseDownPos, gribBoundingBox = "", mouseIsDown = 0;
function display_map()
{
var latlng = new google.maps.LatLng(42, -71);
var myOptions = {zoom: 8, center: latlng, mapTypeId: google.maps.MapTypeId.ROADMAP};
map = new google.maps.Map(document.getElementById("mapdiv"), myOptions);
google.maps.event.addListener(map,'mousemove',function(event) {mouseMove(event);});
google.maps.event.addListener(map,'mousedown',function(event) {mouseDown(event);});
google.maps.event.addListener(map,'mouseup',function(event) {mouseUp(event);});
}
function mouseMove(event)
{
if (mouseIsDown)
{
if (gribBoundingBox) // box exists
{
var bounds = new google.maps.LatLngBounds(gribBoundingBox.getBounds().getSouthWest(), event.latLng);
gribBoundingBox.setBounds(bounds); // If this statement is enabled, I lose mouseUp events
}
else // create bounding box
{
var bounds = new google.maps.LatLngBounds(mouseDownPos, event.latLng);
gribBoundingBox = new google.maps.Rectangle({map: map, bounds: bounds, fillOpacity: 0.05, strokeWeight: 1});
}
}
}
function mouseDown(event)
{
mouseIsDown = 1;
mouseDownPos = event.latLng;
map.setOptions({draggable: false});
}
function mouseUp(event)
{
if (mouseIsDown)
{
mouseIsDown = 0;
map.setOptions({draggable: true});
// var bounds = new google.maps.LatLngBounds(mouseDownPos, event.latLng);
// gribBoundingBox.setBounds(bounds); // If used instead of above, box drawn properly
gribBoundingBox.setEditable(true);
}
}
</script>
</head>
<body onload="display_map()">
<div id="mapdiv" style="width:100%; height:100%"></div>
</body>
</html>
答案 0 :(得分:2)
如果更新矩形边界,则矩形会消耗mouseup
事件(因为鼠标光标现在位于矩形内)。有两种解决方案:
将矩形对象的clickable
属性设置为false
。那么矩形将不会消耗该事件。
gribBoundingBox = new google.maps.Rectangle({map:map,bounds:bounds,fillOpacity:0.05,strokeWeight:1,clickable:false});
将mouseup
事件侦听器添加到矩形对象。这样,事件由矩形消耗和处理。在您的示例中,您可以使用相同的侦听器函数。
google.maps.event.addListener(gribBoundingBox,'mouseup',function(event){mouseUp(event);});
答案 1 :(得分:0)
如果其他解决方案不起作用,也可以尝试在文档上注册mouseup事件。
document.addEventListener('mouseup', function(evt){
stopDraw(evt);
});