我知道这段代码已经可以使用了,但是现在已经停止工作了。我正在使用人员荧光笔工具,但是如果我输入一个单词然后输入mark,它将突出显示实际的标记元素。这是我的代码:

function Search (tagC) {
var notes = document.getElementsByClassName("NoteOp");
for (var i = 0; i < notes.length; i++) {
var n = notes[i];
var tagOut = tagC
var tagFront = tagOut.slice(0, -9);
var tagLast = tagOut.slice(-9);
n.innerHTML = n.innerHTML.replace(new RegExp("\\b(" + tagFront + ")\\b", "gim"), "<mark class=" + tagLast + ">$1</mark>");
if(window.Bold === "Yes") {
    $("mark").css("font-weight", "bold");
}
}
}


tagFront是搜索词,而tagLast是始终有9个字母的类。编码中有任何问题吗?

tagC的示例为:

testYelColBox


...而我正在搜索的文本如下所示:

<div id="NoteHolder">
<p class="NoteOp">This is a test paragraph uses to TeSt filters.</p>
<p class="NoteOp">Random words, I need to see if it will mess up mark</p>
</div>


主要问题:即使我的代码具有\b元字符选择器,为什么我的代码仍标记HTML元素?

最佳答案

您的问题似乎是这样的:

如果您首先突出显示一个单词,它将正常工作。但是现在您的HTML具有<mark>标记,因此,如果现在再次使用搜索词“ mark”进行搜索,则该标记将获得嵌套标记,这是不希望的,并且会使HTML无效。

为什么会这样

\b转义符与搜索字符串中字符序列从字母数字字符切换到非字母数字字符或反之亦然的任何位置匹配。这意味着\b也与<<mark ...>后面的位置以及k后面的位置匹配(因为后面有空格)。



通过仅将其应用于文本节点而不是HTML元素来进行受控替换。为此,您需要遍历节点,检查其类型,并在它们是文本节点时执行替换。由于替换涉及插入HTML元素,因此您实际上应该将该文本节点拆分为之前的内容,mark元素和之后的内容。

这是完成所有这些操作的代码:



function clear() {
    var notes = document.getElementsByClassName("NoteOp");
    for (var i = 0; i < notes.length; i++) {
        var n = notes[i];
        // Remove all opening/closing mark tags
        n.innerHTML = n.innerHTML.replace(/<\/?mark.*?>/gm, "");
    }
}

function highlight(tagC) {
    // Sanity check
    if (tagC.length <= 9) return; // ignore wrong input
    var notes = document.getElementsByClassName("NoteOp");
    // Split into parts before entering loop:
    var tagFront = tagC.slice(0, -9);
    var tagLast = tagC.slice(-9);
    // Escape tagFront characters that could conflict with regex syntax:
    tagLast = tagLast.replace(/([.*+?^${}()|\[\]\/\\])/g, "\\$1");
    var regex = new RegExp("\\b(" + tagFront + ")\\b", "gim");
    // Create a template of the highlight that can be cloned
    var mark = document.createElement('mark');
    mark.setAttribute('class', tagLast);
    // Loop over notes
    for (var i = 0; i < notes.length; i++) {
        // Create a span that will have the contents after replacements
        var span = document.createElement('span');
        // Go through all child nodes of this note
        var nodes = notes[i].childNodes;
        for (var j = 0; j < nodes.length; j++) {
            var node = nodes[j];
            if (node.nodeType === 3) {
                // Only if text node, perform replacement
                parts = node.textContent.split(regex);
                // As regex has capture group, also the split expression is a part
                for (var k = 0; k < parts.length; k++) {
                    // Add this part
                    if (k % 2) {
                        // Add highlighted text
                        mark.textContent = parts[k];
                        span.appendChild(mark.cloneNode(true));
                    } else {
                        // Add text part that did not match as such
                        span.appendChild(document.createTextNode(parts[k]));
                    }
                }
            } else {
                // Non-text nodes are just copied as they are
                span.appendChild(node.cloneNode(true));
            }
        }
        // Replace note contents with new contents
        notes[i].innerHTML = span.innerHTML;
    }
    // Setting style for CSS class should happen outside of the loop
    $("mark").css("font-weight", window.Bold === "Yes" ? "bold": "normal");
}

// I/O
var inp = document.querySelector('#inp');
var btnMark = document.querySelector('#mark');
var btnClear = document.querySelector('#clear');

btnMark.onclick = function () {
    highlight(inp.value + 'YelColBox');
}
btnClear.onclick = clear;

Type text to be highlighted and press Mark:<br>
<input id="inp" value="">
<button id="mark">Mark</button>
<button id="clear">Clear</button>

<div id="NoteHolder">
<p class="NoteOp">This is a test paragraph uses to TeSt filters.</p>
<p class="NoteOp">Random words, I need to see if it will mess up mark</p>
</div>

10-05 20:41
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