我正在搜索跨浏览器解决方案(Chrome,FF,Opera> 10,IE> = 8)以解决以下问题:
有一些HTML代码:
<div>
<div id="one">
<p id="red">red</p>
<p id="green">green</p>
</div>
<div id="two">
<p id="blue">blue</p>
<p id="black">black</p>
</div>
</div>
并且用户使用鼠标文本从'een'(在#green节点中)选择到'blu'(在#blue节点中)。如何检查#blue是否在内部选择(无论是全部还是部分选择)并且#red和#black不在选择范围内。 简单的API看起来像这样:
Selection.isElementSelected(document.getElementById('black'));
我试过使用DOMSelection和Ranges,但问题是我需要检查嵌套结构中的元素。在Chrome中,我可以使用Range.intersectsNode(),但这是唯一支持此方法的浏览器。
有什么建议吗?
答案 0 :(得分:3)
经过一些研究后,我根据以下材料制作了解决方案: https://developer.mozilla.org/en/DOM/range
http://msdn.microsoft.com/en-us/library/ms535872(v=vs.85).aspx
http://www.quirksmode.org/dom/range_intro.html
如果IE8必须选择整个节点,但这对我来说是可以接受的。
以下是jsfiddle上的一些游乐场:http://jsfiddle.net/58Uvd/ 这是代码:
(function () {
function UserRange (win) {
this.win = win || window;
this.doc = this.win.document;
this.userRange = this.createUserRange();
}
var NonIEPrototype = {
constructor: UserRange,
createUserRange: function () {
var selection = this.win.getSelection();
return selection.rangeCount
? selection.getRangeAt(0)
: this.doc.createRange();
},
overlapsNode: function (node) {
return this.intersectsNode(node);
},
intersectsNode: function (node) {
// this method is implemented in Firefox with Gecko before 1.9
// and other non-IE browsers
if (this.userRange.intersectsNode) {
return this.userRange.intersectsNode(node);
}
return this.intersectsRange(this.createRangeWithNode(node));
},
createRangeWithNode: function (node) {
var rangeWithNode = node.ownerDocument.createRange();
try {
rangeWithNode.selectNode(node);
}
catch (ex) {
rangeWithNode.selectNodeContents(node);
}
return rangeWithNode;
},
intersectsRange: function (range) {
return this.userRange.compareBoundaryPoints(Range.END_TO_START, range) === -1 &&
this.userRange.compareBoundaryPoints(Range.START_TO_END, range) === 1;
}
};
var IEPrototype = {
constructor: UserRange,
createUserRange: function () {
return this.doc.selection.createRange();
},
overlapsNode: function (node) {
var rangeWithNode = this.createRangeWithNode(node);
return this.containsRange(rangeWithNode);
},
createRangeWithNode: function (node) {
var range = node.ownerDocument.selection.createRange();
range.moveToElementText(node);
return range;
},
containsRange: function (range) {
return this.userRange.inRange(range);
}
};
UserRange.prototype = window.getSelection ? NonIEPrototype : IEPrototype;
window.UserRange = UserRange;
}());
用法:
var userRange = new UserRange();
userRange.overlapsNode(document.getElementById('node-to-check'));