使用getSelection选择整个单词 [英] Select whole word with getSelection

问题描述

我想使用 getSelection 函数从文章中选择单词到视图框。

I want use the getSelection function to select words from articles to a view box.

这是我的代码： http://jsfiddle.net/xQKNh/2/ 。

现在我想问一下，如何使用JavaScript来选择整个单词？

Now I want to ask, how to use JavaScript to select the whole word?

如需说明，

Is your question about programming?

在我的代码中，如果我选择 r关于pro的问题，查看框将显示

In my code, if I choose r question about pro, the view box will show

r question about pro

但如何完成单词？因此它输出：

But how to make the words completed? So that it outputs:

your question about programming. 

Javascript代码：

Javascript code:

function getSelected() {
  if(window.getSelection) { return window.getSelection(); }
  else if(document.getSelection) { return document.getSelection(); }
  else {
    var selection = document.selection && document.selection.createRange();
    if(selection.text) { return selection.text; }
    return false;
  }
  return false;
}
$(document).ready(function() {
  $('#content-area').mouseup(function() {
    var selection = getSelected();
    if(selection && (selection = new String(selection).replace(/^\s+|\s+$/g,''))) {
        $('#show-text').html(selection)
    }
  });
});

推荐答案

最新版本的Firefox和WebKit浏览器都内置了在 modify（） （另请参见工作进展规范）方法执行此操作的选择对象。从版本4开始，IE有一种完全不同的方法。在任何一种情况下，这种方法都具有跨元素边界工作的显着优势。

Recent versions of Firefox and WebKit browsers have a built-in modify() (see also work-in-progress spec) method of the Selection object to do this. IE has had a completely different way to do this since version 4. In either case, this method has the significant advantage of working across element boundaries.

以下示例适用于IE 4 +，Firefox 4+以及Safari和Chrome在过去几年中发布的版本。 Opera目前还不支持选择对象的 modify（）方法。

The following example works in IE 4+, Firefox 4+ and Safari and Chrome in versions released in the last couple of years. Opera as yet has no support for the modify() method of Selection objects.

2011年10月20日更新

我现在已经（实际上）重写了这一点（它没有正如在评论中指出的那样，之前在非IE浏览器中正常工作。不幸的是，选择扩展在非IE中过于贪婪，并且如果已经选择了整个单词，则将选择扩展到下一个单词，但我现在看不到一个简单的方法。

I've rewritten this to actually (mostly) work now (it didn't work properly in non-IE browsers before, as pointed out in the comments). Unfortunately, the selection expansion is too greedy in non-IE and expands the selection to the next word if a whole word is already selected, but I can't see an easy way round this at the moment.

更新2012年6月11日

我现在更新了这个相关问题的答案。感谢Matt M和Fong-Wan Chau。

I've now updated this with an improvement from this answer to a related question. Thanks to Matt M and Fong-Wan Chau for this.

现场演示： http://jsfiddle.net/rrvw4/23/

代码：

function snapSelectionToWord() {
    var sel;

    // Check for existence of window.getSelection() and that it has a
    // modify() method. IE 9 has both selection APIs but no modify() method.
    if (window.getSelection && (sel = window.getSelection()).modify) {
        sel = window.getSelection();
        if (!sel.isCollapsed) {

            // Detect if selection is backwards
            var range = document.createRange();
            range.setStart(sel.anchorNode, sel.anchorOffset);
            range.setEnd(sel.focusNode, sel.focusOffset);
            var backwards = range.collapsed;
            range.detach();

            // modify() works on the focus of the selection
            var endNode = sel.focusNode, endOffset = sel.focusOffset;
            sel.collapse(sel.anchorNode, sel.anchorOffset);

            var direction = [];
            if (backwards) {
                direction = ['backward', 'forward'];
            } else {
                direction = ['forward', 'backward'];
            }

            sel.modify("move", direction[0], "character");
            sel.modify("move", direction[1], "word");
            sel.extend(endNode, endOffset);
            sel.modify("extend", direction[1], "character");
            sel.modify("extend", direction[0], "word");
        }
    } else if ( (sel = document.selection) && sel.type != "Control") {
        var textRange = sel.createRange();
        if (textRange.text) {
            textRange.expand("word");
            // Move the end back to not include the word's trailing space(s),
            // if necessary
            while (/\s$/.test(textRange.text)) {
                textRange.moveEnd("character", -1);
            }
            textRange.select();
        }
    }
}

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