Javascript：如何un-surroundContents范围 [英] Javascript: how to un-surroundContents range

问题描述

此函数使用范围对象返回用户选择并用粗体标记包装。有没有办法让我删除标签？如< b>文本< b> = 文本。






我实际上需要一个切换功能，它将选择包裹在标签&如果已经包含标签，请将其解包。类似于当您切换粗体按钮时文本编辑器所做的操作。

This function uses the range object to return user selection and wrap it in bold tags. is there a method that allows me to remove the tags? As in <b>text<b> = text.


I actually need a toggle function that wraps the selection in tags & un-wraps it if already contains tags. Similar to what text editors do when you toggle the bold button.

if "text" then "<b>text</b>"
else "<b>text</b>" then "text"  

...

function makeBold() {

    //create variable from selection
    var selection = window.getSelection();
        if (selection.rangeCount) {
        var range = selection.getRangeAt(0).cloneRange();
        var newNode = document.createElement("b");

            //wrap selection in tags
        range.surroundContents(newNode);

            //return the user selection
        selection.removeAllRanges();
        selection.addRange(range);
    } 
}

推荐答案

在你以前的问题中没有提到这个，因为它听起来像是想要一个围绕元素范围的通用方法，但是对于这个特定的应用程序（即加粗/解开文本），并且假设你不介意一点所使用的精确标签中的跨浏览器变化（ 对< bold> 而不是< span style =font-weight：bold> ），最好使用 document.execCommand（） ，将切换粗体：

I didn't mention this in your previous question about this because it sounded like you wanted a generic means of surrounding a range within an element, but for this particular application (i.e. bolding/unbolding text), and assuming you don't mind a little cross-browser variation in the precise tags used (<strong> versus <bold> versus possibly <span style="font-weight: bold">), you're best off using document.execCommand(), which will toggle boldness:

function toggleBold() {
    document.execCommand("bold", false, null);
}

当所选内容可编辑时，这将在所有浏览器中运行，即使它不能在IE中编辑。如果您需要在其他浏览器中使用不可编辑的内容，则需要暂时​​使文档可编辑：

This will work in all browsers when the selected content is editable, and even when it's not editable in IE. If you need it to work on non-editable content in other browsers, you'll need to temporarily make the document editable:

function toggleBold() {
    var range, sel;
    if (window.getSelection) {
        // Non-IE case
        sel = window.getSelection();
        if (sel.getRangeAt) {
            range = sel.getRangeAt(0);
        }
        document.designMode = "on";
        if (range) {
            sel.removeAllRanges();
            sel.addRange(range);
        }
        document.execCommand("bold", false, null);
        document.designMode = "off";
    } else if (document.selection && document.selection.createRange &&
            document.selection.type != "None") {
        // IE case
        range = document.selection.createRange();
        range.execCommand("bold", false, null);
    }
}

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