JavaScript如何从所选文本中提取链接

时间:2013-08-24 12:25:10

标签: javascript getselection

我正在寻找解决方案如何使用window.getSelectiondocument.selection从所选文字中提取网址。

要选择的文字看起来:

<p>Lorem Ipsum is <a href="http://example.com">simply <b>dummy</b> text</a> of the printing and typesetting industry.</p>

所选文本(由用户选择)以提取链接:

选项1(在标签之间包含文字和文字):

Ipsum is simply dummy text of

选项2(选择文本和链接片段):

Ipsum is simply

该函数应该返回http://example.com

2 个答案:

答案 0 :(得分:2)

很难写出跨浏览器功能。请参阅How to bind a handler to a selection change on window?

我们应该捕获一些事件,例如mousedownmouseuptouchstarttouchend。这些事件的组合可能没问题。

function addEvent(elem, event, func) {
    if (elem.addEventListener) {
        elem.addEventListener(event, func, false);
    } else {
        elem.attachEvent('on' + event, func);
    }
}

接下来是getSelectedHTML()使用window.getSelectiondocument.selection

function getSelectedHTML(event) {
    // http://www.w3.org/TR/2000/REC-DOM-Level-2-Traversal-Range-20001113/ranges.html
    var range = window.getSelection ? window.getSelection()  /* W3C */
    : document.getSelection ? document.getSelection() /* redundant? */
    : document.selection ? document.selection.createRange()   /* IE */
    : null;

    if (range) {
        if (range.getRangeAt) {
            range = range.getRangeAt(0);
        } else if (range.setStart) { // Safari 1.3
            // Create range by itself
            range.setStart(range.anchorNode, range.anchorOffset);
            range.setEnd(range.focusNode, range.focusOffset);
        } else {
            // IE is already reange
        }

        var html = null, link = null;
        if (range.cloneContents) {
            var dummy = document.createElement('div');
            dummy.appendChild(range.cloneContents());
            html = dummy.innerHTML;
        } else {
            html = range.htmlText; /* IE */
        }

        if (html) {
            link = html.match(/<a.*?href\s*?=['"](.*?)['"]/);
            return link ? link[1] : null;
        }
    }

    return null;
}

应特别使用旧浏览器检查此代码。

以下是示例小提琴:http://jsfiddle.net/tokkonoPapa/CQ63a/

答案 1 :(得分:0)

如果我误解了这个问题,我很抱歉,但这是我的建议。

拥有一个函数并将选中的HTML传递给它,让它像这样处理它。

function FindLink(str){
    // str='<p>Lorem Ipsum is <a href="http://example.com">simply <b>dummy</b> text</a> of the printing and typesetting industry.</p>';

    // we get the index of the beginning of the <a> tag
    var n = str.indexOf("<a") ;

    // we find the href property of the <a> element, starting from the <a we found
    var n2 = str.indexOf("href=\"", n) + 6;

    // we find the end of the href property
    n3 = str.indexOf("\">",n2);

    // we find the substring starting at the beginning of the link and going for however many characters the link is
    link = str.substr(n2,n3-n2);

    return link;
}

我希望有所帮助!