[英]JavaScript 'contenteditable' — Getting/Setting Caret Position
[英]Caret position resets in contenteditable when setting innerHTML
我在另一個主題中找到了真正的解決方案: 如何在contenteditable元素(div)中設置插入符(光標)的位置?
這是代碼:
function createRange(node, chars, range) {
if (!range) {
range = document.createRange()
range.selectNode(node);
range.setStart(node, 0);
}
if (chars.count === 0) {
range.setEnd(node, chars.count);
} else if (node && chars.count >0) {
if (node.nodeType === Node.TEXT_NODE) {
if (node.textContent.length < chars.count) {
chars.count -= node.textContent.length;
} else {
range.setEnd(node, chars.count);
chars.count = 0;
}
} else {
for (var lp = 0; lp < node.childNodes.length; lp++) {
range = createRange(node.childNodes[lp], chars, range);
if (chars.count === 0) {
break;
}
}
}
}
return range;
};
function setCurrentCursorPosition(element,chars) {
if (chars >= 0) {
var selection = window.getSelection();
range = createRange(element.parentNode, { count: chars });
if (range) {
range.collapse(false);
selection.removeAllRanges();
selection.addRange(range);
}
}
};
function isChildOf(node, parentId) {
while (node !== null) {
if (node.id === parentId) {
return true;
}
node = node.parentNode;
}
return false;
};
function getCurrentCursorPosition(parentId) {
var selection = window.getSelection(),
charCount = -1,
node;
if (selection.focusNode) {
if (isChildOf(selection.focusNode, parentId)) {
node = selection.focusNode;
charCount = selection.focusOffset;
while (node) {
if (node.id === parentId) {
break;
}
if (node.previousSibling) {
node = node.previousSibling;
charCount += node.textContent.length;
} else {
node = node.parentNode;
if (node === null) {
break;
}
}
}
}
}
return charCount;
};
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