如何使用javascript从iframe中选择文本？ [英] how to get selected text from iframe with javascript?
问题描述
<html>
<body>
<script type="text/javascript">
function smth() {
if (document.getSelection) {
var str = document.getSelection();
if (window.RegExp) {
var regstr = unescape("%20%20%20%20%20");
var regexp = new RegExp(regstr, "g");
str = str.replace(regexp, "");
}
} else if (document.selection && document.selection.createRange) {
var range = document.selection.createRange();
var str = range.text;
}
alert(str);
}
</script>
<iframe id="my" width="300" height="225">
.....some html ....
</iframe>
<a href="#" onclick="smth();">AA</a>
</body>
</html>
smth 功能我可以选择文字来自某个div，但它不适用于iframe。
如何从iframe中获取所选文本的任何想法？
with smth function i can get selected text from some div, but it doesnt work with iframe.
any ideas how to get selected text from iframe ?
推荐答案
document.getSelection
document.getSelection
在外部文件上。要在iframe中选择文档，您需要获取内部文档：
Is on the outer document. To get the selection of the document in the iframe you need to grab the inner document:
var iframe= document.getElementById('my');
var idoc= iframe.contentDocument || iframe.contentWindow.document; // ie compatibility
idoc.getSelection()
注意WebKit不支持 document.getSelection（） 或 document.selection 。尝试将其替换为 window.getSelection（），它可以在Firefox和WebKit中使用，但返回一个选择对象（Ranges周围的集合/包装），需要字符串：
Note however that WebKit does not support document.getSelection() or document.selection. Try replacing it with window.getSelection() which works in both Firefox and WebKit, but returns a selection object (a collection/wrapper around Ranges), which needs stringing:
var idoc= iframe.contentDocument || iframe.contentWindow.document;
var iwin= iframe.contentWindow || iframe.contentDocument.defaultView;
''+iwin.getSelection()
我不确定这是什么意思：
I'm not sure what the point of this is:
if (window.RegExp) {
var regstr = unescape("%20%20%20%20%20");
var regexp = new RegExp(regstr, "g");
str = str.replace(regexp, "");
}
RegExp 是基本的JavaScript可以追溯到最早的版本;它永远存在，你不必嗅闻它。多个空格的URL编码是非常不必要的。你甚至不需要RegExp，字符串替换可以写成：
RegExp is basic JavaScript dating back to the very earliest version; it will always be there, you don't have to sniff for it. The URL-encoding of multiple spaces is quite unnecessary. You don't even need RegExp as such, a string replace could be written as:
str= str.split(' ').join('');
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