我对此很感兴趣,所以我写了一个完整解决方案的起点。以下使用我的Rangy 库及其选择保存/恢复模块来保存和恢复选择并规范跨浏览器问题。它用一个链接元素包围所有匹配的文本(在这种情况下为@whatever),并将选择定位在之前的位置。这会在一秒钟内没有键盘活动后触发。它应该是可重复使用的。
function createLink(matchedTextNode) {
var el = document.createElement("a");
el.style.backgroundColor = "yellow";
el.style.padding = "2px";
el.contentEditable = false;
var matchedName = matchedTextNode.data.slice(1); // Remove the leading @
el.href = "http://www.example.com/?name=" + matchedName;
matchedTextNode.data = matchedName;
el.appendChild(matchedTextNode);
return el;
}
function shouldLinkifyContents(el) {
return el.tagName != "A";
}
function surroundInElement(el, regex, surrounderCreateFunc, shouldSurroundFunc) {
var child = el.lastChild;
while (child) {
if (child.nodeType == 1 && shouldSurroundFunc(el)) {
surroundInElement(child, regex, surrounderCreateFunc, shouldSurroundFunc);
} else if (child.nodeType == 3) {
surroundMatchingText(child, regex, surrounderCreateFunc);
}
child = child.previousSibling;
}
}
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);
}
}
function updateLinks() {
var el = document.getElementById("editable");
var savedSelection = rangy.saveSelection();
surroundInElement(el, /@\w+/, createLink, shouldLinkifyContents);
rangy.restoreSelection(savedSelection);
}
var keyTimer = null, keyDelay = 1000;
function keyUpLinkifyHandler() {
if (keyTimer) {
window.clearTimeout(keyTimer);
}
keyTimer = window.setTimeout(function() {
updateLinks();
keyTimer = null;
}, keyDelay);
}
HTML:
<p contenteditable="true" id="editable" onkeyup="keyUpLinkifyHandler()">
Some editable content for @someone or other
</p>