![](/img/trans.png)
[英]Is there any Javascript document viewer engine with text highlighting API?
[英]Highlighting text in document (JavaScript) Efficiently
如何(有效地-不降低计算机[cpu]的速度)突出显示页面的特定部分?
可以说我的页面是这样的:
<html>
<head>
</head>
<body>
"My generic words would be selected here" !.
<script>
//highlight code here
var textToHighlight = 'selected here" !';
//what sould I write here?
</script>
</body>
</html>
我的想法是将所有主体“克隆”到变量中,并通过indexOf查找指定的文本,更改(插入带有背景色的跨度)“ cloned”字符串,并将“ real”主体替换为“ cloned”字符串。
我只是认为这没有效率。
你还有其他建议吗? (很有创意:))
我已将我的答案中的以下内容改编为关于SO的几个类似问题( 示例 )。 它被设计为可重用,事实证明是这样。 它遍历您指定的容器节点内的DOM,在每个文本节点中搜索指定的文本,并使用DOM方法拆分文本节点并将相关文本块包围在样式化的<span>
元素中。
演示: http : //jsfiddle.net/HqjZa/
码:
// Reusable generic function
function surroundInElement(el, regex, surrounderCreateFunc) {
// script and style elements are left alone
if (!/^(script|style)$/.test(el.tagName)) {
var child = el.lastChild;
while (child) {
if (child.nodeType == 1) {
surroundInElement(child, regex, surrounderCreateFunc);
} else if (child.nodeType == 3) {
surroundMatchingText(child, regex, surrounderCreateFunc);
}
child = child.previousSibling;
}
}
}
// Reusable generic function
function surroundMatchingText(textNode, regex, surrounderCreateFunc) {
var parent = textNode.parentNode;
var result, surroundingNode, matchedTextNode, matchLength, matchedText;
while ( textNode && (result = regex.exec(textNode.data)) ) {
matchedTextNode = textNode.splitText(result.index);
matchedText = result[0];
matchLength = matchedText.length;
textNode = (matchedTextNode.length > matchLength) ?
matchedTextNode.splitText(matchLength) : null;
surroundingNode = surrounderCreateFunc(matchedTextNode.cloneNode(true));
parent.insertBefore(surroundingNode, matchedTextNode);
parent.removeChild(matchedTextNode);
}
}
// This function does the surrounding for every matched piece of text
// and can be customized to do what you like
function createSpan(matchedTextNode) {
var el = document.createElement("span");
el.style.backgroundColor = "yellow";
el.appendChild(matchedTextNode);
return el;
}
// The main function
function wrapText(container, text) {
surroundInElement(container, new RegExp(text, "g"), createSpan);
}
wrapText(document.body, "selected here");
<html>
<head>
</head>
<body>
<p id="myText">"My generic words would be selected here" !.</p>
<script>
//highlight code here
var textToHighlight = 'selected here" !';
var text = document.getElementById("myText").innerHTML
document.getElementById("myText").innerHTML = text.replace(textToHighlight, '<span style="color:red">'+textToHighlight+'</span>');
//what sould I write here?
</script>
</body>
</html>
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.