javascript - 在 VML 和 Internet Explorer 中禁用图形元素选择

Question

我有一个 JavaScript 应用程序，可以让用户在绘图区域周围移动形状，而我碰巧正在使用 Google Closure 库。在 FF/Safari 中一切都很好。在 IE 中，随着图形元素的移动，它们会被浏览器（移动元素和其他元素）选中，以不可预知的方式在某些元素周围显示彩色虚线背景：

http://i.imgur.com/O33MN.png

如何在 IE 中关闭此行为？

Answer 1

It's hard to diagnose your problem on the information provided. IE VML is not very well supported and therefore pretty buggy.

In DojoX Drawing, I ran into a similar problem when drawing lines. VML has a bug where you can't drag and resize at the same time – but, you can drag and create at the same time, so I redraw the line, I don't transform it.

Further, I don't attach my click/drag events to the shape, I attach them to the overall main container, detect the id on the mousedown event, then track the mousemove and move the shape via doing a setTransform on the shape's container.

Essentially, because of the weak VML support, you have to be willing to try totally different things to get it to work.

Answer 2

经过一些实验，我找到了部分答案。

goog.events.Event类有一个 preventDefault 方法。只需处理图形元素上的 MOUSEMOVE 事件。然后调用 event#preventDefault 方法：

var element = ... // some element
var graphics = goog.graphics.createGraphics('400', '300');

var fill = new goog.graphics.SolidFill('#00ff00', 0.5);
var stroke = new goog.graphics.Stroke(1, 'black');

graphics.drawEllipse(60, 60, 10, 10, stroke, fill);
graphics.drawEllipse(90, 90, 10, 10, stroke, fill);

graphics.render(element);

goog.events.listen(graphics.getElement(), goog.events.EventType.MOUSEMOVE, function(e) {
  e.preventDefault();
  e.stopPropagation();
});

在图形元素内部单击，然后拖动不再选择圆圈。同样，这仅在 IE 上是必需的。

一个小问题仍然存在。在图形区域外按下鼠标，然后将光标拖入图形区域会导致整个区域被选中，或者区域和图形元素都被选中。