window.getSelection()与HTML标签的偏移量

window.getSelection() offset with HTML tags?

本文关键字：标签 偏移量 HTML getSelection window      更新时间：2023-09-26

如果我有以下HTML:

<div class="content">
Vivamus <span>luctus</span> urna sed urna ultricies ac tempor dui sagittis.
</div>

我在mouseup上运行一个事件，查看所选文本的范围:

$(".content").on("mouseup", function () {
    var start = window.getSelection().baseOffset;
    var end = window.getSelection().focusOffset;
    if (start < end) {
        var start = window.getSelection().baseOffset;
        var end = window.getSelection().focusOffset;
    } else {
        var start = window.getSelection().focusOffset;
        var end = window.getSelection().baseOffset;
    }
    console.log(window.getSelection());
    console.log(start + ", " + end);
});

我从内容中选择单词Vivamus，它将记录1, 8，因为这是选择的范围。

如果，但是，我选择单词urna，它将记录15, 20，但不会考虑HTML的<span>元素。

无论如何focusOffset和baseOffset也计算HTML标签，而不仅仅是文本?

更新

实例:http://jsfiddle.net/FLwxj/61/

使用clearSelection()函数和替换方法，我能够获得所需的结果。

var txt = $('#Text').html();
$('#Text').html(
    txt.replace(/<'/span>(?:'s)*<span class="highlight">/g, '')
);
clearSelection();

来源:

  • clearSelection(): https://stackoverflow.com/a/6562764/1085891
  • 替代方法:https://stackoverflow.com/a/7168142/1085891

下面你会发现一些有效的解决方法。我将它们按代码效率排序。

工作方案

  • https://stackoverflow.com/a/8697302/1085891(实例)

    window.highlight = function() {
    var selection = window.getSelection().getRangeAt(0);
    var selectedText = selection.extractContents();
    var span = document.createElement("span");
    span.style.backgroundColor = "yellow";
    span.appendChild(selectedText);
    span.onclick = function (ev) {
    this.parentNode.insertBefore(
        document.createTextNode(this.innerHTML), 
        this
    );
    this.parentNode.removeChild(this);
    }
    selection.insertNode(span);
}

  • https://stackoverflow.com/a/1623974/1085891(实例)

    $(".content").on("mouseup", function () {
   makeEditableAndHighlight('yellow'); 
});
function makeEditableAndHighlight(colour) {
    sel = window.getSelection();
    if (sel.rangeCount && sel.getRangeAt) {
    range = sel.getRangeAt(0);
    }
    document.designMode = "on";
    if (range) {
    sel.removeAllRanges();
    sel.addRange(range);
    }
    // Use HiliteColor since some browsers apply BackColor to the whole block
    if (!document.execCommand("HiliteColor", false, colour)) {
    document.execCommand("BackColor", false, colour);
    }
    document.designMode = "off";
}
function highlight(colour) {
    var range, sel;
    if (window.getSelection) {
    // IE9 and non-IE
    try {
        if (!document.execCommand("BackColor", false, colour)) {
        makeEditableAndHighlight(colour);
        }
    } catch (ex) {
        makeEditableAndHighlight(colour)
    }
    } else if (document.selection && document.selection.createRange) {
    // IE <= 8 case
    range = document.selection.createRange();
    range.execCommand("BackColor", false, colour);
    }
}

  • https://stackoverflow.com/a/12823606/1085891(实例)

其他有用的解决方案:

  • http://tech.pro/tutorial/1075/javascript-highlighting-selected-text
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