将 br 插入文本节点

发布于 2024-11-02 02:58:42 字数 937 浏览 0 评论 0原文

这可能看起来很奇怪。我有一个 id 为“quotes”的 div,里面有一个块引用。我认为如果引用的文本是诗歌,添加换行符会很有趣,并且我认为您可以使用“@”作为条件换行符,然后将其替换为 br 元素,如下所示:

function addBr() {
    var c = document.getElementById("quotes");
    var t = c.getElementsByTagName("blockquote");    
    var reg = new RegExp("@", "g");
    for (var i = 0; i < t.length; i++) {
        var r = t[i].lastChild.nodeValue.match(reg);
        if (r !== null) {
            var text = t[i].childNodes[0];
            var q = t[i].lastChild.nodeValue.indexOf("@");
            var x = document.createElement("br");
            t[i].insertBefore(x, text.splitText(q));
            t[i].lastChild.nodeValue = t[i].lastChild.nodeValue.replace(/\@/g, "");
        }
    }
}

这有效,但仅对于第一个例子,所以我需要一个循环,但我无法弄清楚。 div 会是这样的:

<div id = 'quotes'>
<blockquote> Some line, @ Some line, @ Some line@ </blockquote>
</div>

任何提示将不胜感激。

This might seem odd. I have a div with the id of 'quotes', and inside there is a blockquote. I thought it would be interesting to add line breaks, if the quoted text were poetry, and I thought you could use a '@' as a conditional line break, and then replace this with the br element as follows:

function addBr() {
    var c = document.getElementById("quotes");
    var t = c.getElementsByTagName("blockquote");    
    var reg = new RegExp("@", "g");
    for (var i = 0; i < t.length; i++) {
        var r = t[i].lastChild.nodeValue.match(reg);
        if (r !== null) {
            var text = t[i].childNodes[0];
            var q = t[i].lastChild.nodeValue.indexOf("@");
            var x = document.createElement("br");
            t[i].insertBefore(x, text.splitText(q));
            t[i].lastChild.nodeValue = t[i].lastChild.nodeValue.replace(/\@/g, "");
        }
    }
}

This works, but only for the first instance, so I need a loop, but I can't figure that out.
The div would be like this:

<div id = 'quotes'>
<blockquote> Some line, @ Some line, @ Some line@ </blockquote>
</div>

Any hints would be deeply appreciated.

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评论(2

烟雨凡馨 2024-11-09 02:58:42

从文本节点中最后一个匹配的 @ 开始,然后向后进行。以下函数执行此操作,并且还具有消除不必要的正则表达式、使用更清晰的变量名称并且更短的优点:

function addBr() {
    var c = document.getElementById("quotes");
    var t = c.getElementsByTagName("blockquote");
    for (var i = 0; i < t.length; i++) {
        var splitPos, textNode = t[i].lastChild;

        while ( (splitPos = textNode.data.lastIndexOf("@")) != -1 ) {
            var newTextNode = textNode.splitText(splitPos);

            // Remove the @ from the start of the new text node
            newTextNode.deleteData(0, 1);

            var br = document.createElement("br");
            t[i].insertBefore(br, newTextNode);
        }
    }
}

Start with the last match of @ within the text node and work backwards. The following function does this and also has the benefit of eliminating the unnecessary regex, uses clearer variable names and is shorter:

function addBr() {
    var c = document.getElementById("quotes");
    var t = c.getElementsByTagName("blockquote");
    for (var i = 0; i < t.length; i++) {
        var splitPos, textNode = t[i].lastChild;

        while ( (splitPos = textNode.data.lastIndexOf("@")) != -1 ) {
            var newTextNode = textNode.splitText(splitPos);

            // Remove the @ from the start of the new text node
            newTextNode.deleteData(0, 1);

            var br = document.createElement("br");
            t[i].insertBefore(br, newTextNode);
        }
    }
}
臻嫒无言 2024-11-09 02:58:42

我建议简单地这样做:

function addBr() {
    var c = document.getElementById("quotes");
    var t = c.getElementsByTagName("blockquote");    
    for (var i = 0; i < t.length; i++)
        r.innerHTML = r.innerHTML.replace(/@/g, "<br />");
}

什么是“条件换行符”?我在你的代码中没有看到任何决定何时断线的内容......

I would suggest simply doing this:

function addBr() {
    var c = document.getElementById("quotes");
    var t = c.getElementsByTagName("blockquote");    
    for (var i = 0; i < t.length; i++)
        r.innerHTML = r.innerHTML.replace(/@/g, "<br />");
}

What is a "conditional line break"? I don't see anything in your code that decides when to break the line...

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