我找到了大量关于如何在元素中设置插入符号位置的跨浏览器的好答案contentEditable，但没有找到关于如何首先获得插入符号位置的答案。
我想要做的是知道 div 上的插入符号位置keyup。因此，当用户输入文本时，我可以随时知道contentEditable元素中插入符号的位置。
<div id="contentBox" contentEditable="true"></div>
$('#contentbox').keyup(function() {
// ... ?
});
以下代码假设：
<div>，没有其他节点white-space属性设置为pre如果您需要一种更通用的方法来处理嵌套元素的内容，请尝试以下答案：
https://stackoverflow.com/a/4812022/96100
代码：
function getCaretPosition(editableDiv) {
var caretPos = 0,
sel, range;
if (window.getSelection) {
sel = window.getSelection();
if (sel.rangeCount) {
range = sel.getRangeAt(0);
if (range.commonAncestorContainer.parentNode == editableDiv) {
caretPos = range.endOffset;
}
}
} else if (document.selection && document.selection.createRange) {
range = document.selection.createRange();
if (range.parentElement() == editableDiv) {
var tempEl = document.createElement("span");
editableDiv.insertBefore(tempEl, editableDiv.firstChild);
var tempRange = range.duplicate();
tempRange.moveToElementText(tempEl);
tempRange.setEndPoint("EndToEnd", range);
caretPos = tempRange.text.length;
}
}
return caretPos;
}#caretposition {
font-weight: bold;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="contentbox" contenteditable="true">Click me and move cursor with keys or mouse</div>
<div id="caretposition">0</div>
<script>
var update = function() {
$('#caretposition').html(getCaretPosition(this));
};
$('#contentbox').on("mousedown mouseup keydown keyup", update);
</script>我没有在其他答案中看到的一些皱纹：
这是一种获取开始和结束位置作为元素 textContent 值的偏移量的方法：
// node_walk: walk the element tree, stop when func(node) returns false
function node_walk(node, func) {
var result = func(node);
for(node = node.firstChild; result !== false && node; node = node.nextSibling)
result = node_walk(node, func);
return result;
};
// getCaretPosition: return [start, end] as offsets to elem.textContent that
// correspond to the selected portion of text
// (if start == end, caret is at given position and no text is selected)
function getCaretPosition(elem) {
var sel = window.getSelection();
var cum_length = [0, 0];
if(sel.anchorNode == elem)
cum_length = [sel.anchorOffset, sel.extentOffset];
else {
var nodes_to_find = [sel.anchorNode, sel.extentNode];
if(!elem.contains(sel.anchorNode) || !elem.contains(sel.extentNode))
return undefined;
else {
var found = [0,0];
var i;
node_walk(elem, function(node) {
for(i = 0; i < 2; i++) {
if(node == nodes_to_find[i]) {
found[i] = true;
if(found[i == 0 ? 1 : 0])
return false; // all done
}
}
if(node.textContent && !node.firstChild) {
for(i = 0; i < 2; i++) {
if(!found[i])
cum_length[i] += node.textContent.length;
}
}
});
cum_length[0] += sel.anchorOffset;
cum_length[1] += sel.extentOffset;
}
}
if(cum_length[0] <= cum_length[1])
return cum_length;
return [cum_length[1], cum_length[0]];
}
$("#editable").on('keydown keyup mousedown mouseup',function(e){
if($(window.getSelection().anchorNode).is($(this))){
$('#position').html('0')
}else{
$('#position').html(window.getSelection().anchorOffset);
}
});body{
padding:40px;
}
#editable{
height:50px;
width:400px;
border:1px solid #000;
}
#editable p{
margin:0;
padding:0;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.1/jquery.min.js"></script>
<div contenteditable="true" id="editable">move the cursor to see position</div>
<div>
position : <span id="position"></span>
</div>派对有点晚了，但以防其他人在挣扎。过去两天我发现的 Google 搜索都没有找到任何可行的方法，但我想出了一个简洁而优雅的解决方案，无论您有多少嵌套标签，它都将始终有效：
function cursor_position() {
var sel = document.getSelection();
sel.modify("extend", "backward", "paragraphboundary");
var pos = sel.toString().length;
if(sel.anchorNode != undefined) sel.collapseToEnd();
return pos;
}
// Demo:
var elm = document.querySelector('[contenteditable]');
elm.addEventListener('click', printCaretPosition)
elm.addEventListener('keydown', printCaretPosition)
function printCaretPosition(){
console.log( cursor_position(), 'length:', this.textContent.trim().length )
}<div contenteditable>some text here <i>italic text here</i> some other text here <b>bold text here</b> end of text</div>它一直选择回到段落的开头，然后计算字符串的长度以获得当前位置，然后撤消选择以将光标返回到当前位置。如果您想对整个文档（超过一个段落）执行此操作，请更改paragraphboundary为documentboundary您的案例的任何粒度。查看 API 了解更多详情。干杯! :)
这个对我有用：
function getCaretCharOffset(element) {
var caretOffset = 0;
if (window.getSelection) {
var range = window.getSelection().getRangeAt(0);
var preCaretRange = range.cloneRange();
preCaretRange.selectNodeContents(element);
preCaretRange.setEnd(range.endContainer, range.endOffset);
caretOffset = preCaretRange.toString().length;
}
else if (document.selection && document.selection.type != "Control") {
var textRange = document.selection.createRange();
var preCaretTextRange = document.body.createTextRange();
preCaretTextRange.moveToElementText(element);
preCaretTextRange.setEndPoint("EndToEnd", textRange);
caretOffset = preCaretTextRange.text.length;
}
return caretOffset;
}
// Demo:
var elm = document.querySelector('[contenteditable]');
elm.addEventListener('click', printCaretPosition)
elm.addEventListener('keydown', printCaretPosition)
function printCaretPosition(){
console.log( getCaretCharOffset(elm), 'length:', this.textContent.trim().length )
}<div contenteditable>some text here <i>italic text here</i> some other text here <b>bold text here</b> end of text</div>调用行取决于事件类型，对于关键事件，请使用：
getCaretCharOffsetInDiv(e.target) + ($(window.getSelection().getRangeAt(0).startContainer.parentNode).index());
对于鼠标事件使用这个：
getCaretCharOffsetInDiv(e.target.parentElement) + ($(e.target).index())
在这两种情况下，我通过添加目标索引来处理断线
function getCaretPosition() {
var x = 0;
var y = 0;
var sel = window.getSelection();
if(sel.rangeCount) {
var range = sel.getRangeAt(0).cloneRange();
if(range.getClientRects()) {
range.collapse(true);
var rect = range.getClientRects()[0];
if(rect) {
y = rect.top;
x = rect.left;
}
}
}
return {
x: x,
y: y
};
}
因为这花了我很长时间才弄清楚使用新的window.getSelection API，我将分享给后代。请注意，MDN 建议对 window.getSelection 有更广泛的支持，但是，您的情况可能会有所不同。
const getSelectionCaretAndLine = () => {
// our editable div
const editable = document.getElementById('editable');
// collapse selection to end
window.getSelection().collapseToEnd();
const sel = window.getSelection();
const range = sel.getRangeAt(0);
// get anchor node if startContainer parent is editable
let selectedNode = editable === range.startContainer.parentNode
? sel.anchorNode
: range.startContainer.parentNode;
if (!selectedNode) {
return {
caret: -1,
line: -1,
};
}
// select to top of editable
range.setStart(editable.firstChild, 0);
// do not use 'this' sel anymore since the selection has changed
const content = window.getSelection().toString();
const text = JSON.stringify(content);
const lines = (text.match(/\\n/g) || []).length + 1;
// clear selection
window.getSelection().collapseToEnd();
// minus 2 because of strange text formatting
return {
caret: text.length - 2,
line: lines,
}
}
这是一个在 keyup 上触发的jsfiddle。但是请注意，快速方向键按下以及快速删除似乎是跳过事件。
//global savedrange variable to store text range in
var savedrange = null;
function getSelection()
{
var savedRange;
if(window.getSelection && window.getSelection().rangeCount > 0) //FF,Chrome,Opera,Safari,IE9+
{
savedRange = window.getSelection().getRangeAt(0).cloneRange();
}
else if(document.selection)//IE 8 and lower
{
savedRange = document.selection.createRange();
}
return savedRange;
}
$('#contentbox').keyup(function() {
var currentRange = getSelection();
if(window.getSelection)
{
//do stuff with standards based object
}
else if(document.selection)
{
//do stuff with microsoft object (ie8 and lower)
}
});
注意：范围对象其自身可以存储在一个变量中，并且可以随时重新选择，除非 contenteditable div 的内容发生变化。
IE 8 及更低版本的参考：http: //msdn.microsoft.com/en-us/library/ms535872 (VS.85).aspx
标准（所有其他）浏览器的参考： https ://developer.mozilla.org/en/DOM/range （它的 mozilla 文档，但代码也适用于 chrome、safari、opera 和 ie9）
如果将可编辑的 div 样式设置为“display:inline-block; white-space: pre-wrap”，当你输入新行时，你不会得到新的子 div，你只会得到 LF 字符（即 ）； .
function showCursPos(){
selection = document.getSelection();
childOffset = selection.focusOffset;
const range = document.createRange();
eDiv = document.getElementById("eDiv");
range.setStart(eDiv, 0);
range.setEnd(selection.focusNode, childOffset);
var sHtml = range.toString();
p = sHtml.length;
sHtml=sHtml.replace(/(\r)/gm, "\\r");
sHtml=sHtml.replace(/(\n)/gm, "\\n");
document.getElementById("caretPosHtml").value=p;
document.getElementById("exHtml").value=sHtml;
}click/type in div below:
<br>
<div contenteditable name="eDiv" id="eDiv"
onkeyup="showCursPos()" onclick="showCursPos()"
style="width: 10em; border: 1px solid; display:inline-block; white-space: pre-wrap; "
>123 456 789</div>
<p>
html caret position:<br> <input type="text" id="caretPosHtml">
<p>
html from start of div:<br> <input type="text" id="exHtml">我注意到当您在可编辑的 div 中按“enter”时，它会创建一个新节点，因此 focusOffset 重置为零。这就是为什么我必须添加一个范围变量，并将其从子节点的 focusOffset 扩展到 eDiv 的开头（从而捕获中间的所有文本）。
这个建立在@alockwood05 的答案之上，并为插入符提供了获取和设置功能，其中包含可内容编辑的 div 内的嵌套标签以及节点内的偏移量，以便您拥有一个既可序列化又可通过偏移量反序列化的解决方案。
我在跨平台代码编辑器中使用此解决方案，该编辑器需要在通过词法分析器/解析器突出显示语法之前获取插入符号开始/结束位置，然后立即将其设置回来。
function countUntilEndContainer(parent, endNode, offset, countingState = {count: 0}) {
for (let node of parent.childNodes) {
if (countingState.done) break;
if (node === endNode) {
countingState.done = true;
countingState.offsetInNode = offset;
return countingState;
}
if (node.nodeType === Node.TEXT_NODE) {
countingState.offsetInNode = offset;
countingState.count += node.length;
} else if (node.nodeType === Node.ELEMENT_NODE) {
countUntilEndContainer(node, endNode, offset, countingState);
} else {
countingState.error = true;
}
}
return countingState;
}
function countUntilOffset(parent, offset, countingState = {count: 0}) {
for (let node of parent.childNodes) {
if (countingState.done) break;
if (node.nodeType === Node.TEXT_NODE) {
if (countingState.count <= offset && offset < countingState.count + node.length)
{
countingState.offsetInNode = offset - countingState.count;
countingState.node = node;
countingState.done = true;
return countingState;
}
else {
countingState.count += node.length;
}
} else if (node.nodeType === Node.ELEMENT_NODE) {
countUntilOffset(node, offset, countingState);
} else {
countingState.error = true;
}
}
return countingState;
}
function getCaretPosition()
{
let editor = document.getElementById('editor');
let sel = window.getSelection();
if (sel.rangeCount === 0) { return null; }
let range = sel.getRangeAt(0);
let start = countUntilEndContainer(editor, range.startContainer, range.startOffset);
let end = countUntilEndContainer(editor, range.endContainer, range.endOffset);
let offsetsCounts = { start: start.count + start.offsetInNode, end: end.count + end.offsetInNode };
let offsets = { start: start, end: end, offsets: offsetsCounts };
return offsets;
}
function setCaretPosition(start, end)
{
let editor = document.getElementById('editor');
let sel = window.getSelection();
if (sel.rangeCount === 0) { return null; }
let range = sel.getRangeAt(0);
let startNode = countUntilOffset(editor, start);
let endNode = countUntilOffset(editor, end);
let newRange = new Range();
newRange.setStart(startNode.node, startNode.offsetInNode);
newRange.setEnd(endNode.node, endNode.offsetInNode);
sel.removeAllRanges();
sel.addRange(newRange);
return true;
}
一种直接的方式，它遍历 contenteditable div 的所有子项，直到它到达 endContainer。然后我添加结束容器偏移量，我们就有了字符索引。应该与任意数量的嵌套一起使用。使用递归。
注意：需要一个多边形填充来支持 ieElement.closest('div[contenteditable]')
https://codepen.io/alockwood05/pen/vMpdmZ
function caretPositionIndex() {
const range = window.getSelection().getRangeAt(0);
const { endContainer, endOffset } = range;
// get contenteditableDiv from our endContainer node
let contenteditableDiv;
const contenteditableSelector = "div[contenteditable]";
switch (endContainer.nodeType) {
case Node.TEXT_NODE:
contenteditableDiv = endContainer.parentElement.closest(contenteditableSelector);
break;
case Node.ELEMENT_NODE:
contenteditableDiv = endContainer.closest(contenteditableSelector);
break;
}
if (!contenteditableDiv) return '';
const countBeforeEnd = countUntilEndContainer(contenteditableDiv, endContainer);
if (countBeforeEnd.error ) return null;
return countBeforeEnd.count + endOffset;
function countUntilEndContainer(parent, endNode, countingState = {count: 0}) {
for (let node of parent.childNodes) {
if (countingState.done) break;
if (node === endNode) {
countingState.done = true;
return countingState;
}
if (node.nodeType === Node.TEXT_NODE) {
countingState.count += node.length;
} else if (node.nodeType === Node.ELEMENT_NODE) {
countUntilEndContainer(node, endNode, countingState);
} else {
countingState.error = true;
}
}
return countingState;
}
}
这个适用于角度
private getCaretPosition() {
let caretRevCount = 0;
if (window.getSelection) {
const selection = window.getSelection();
const currentNode = selection.focusNode.parentNode;
caretRevCount = selection.focusOffset;
let previousNode = currentNode.previousSibling;
while(previousNode && previousNode.nodeName === 'SPAN') {
// you can check specific element
caretRevCount += previousNode.textContent.length;
previousNode = previousNode.previousSibling;
}
}
return caretRevCount;
}
我使用了John Ernest的优秀代码，并根据我的需要对其进行了一些修改：
在研究它时，我偶然发现了鲜为人知（或很少使用）的 TreeWalker，并进一步简化了代码，因为它可以摆脱递归性。
一种可能的优化可能是遍历树一次以找到开始节点和结束节点，但是：
相反，我处理了开始与结束相同的情况（只是一个插入符号，没有真正的选择）。
[编辑] 范围的节点似乎总是文本类型，所以我简化了一些代码，它允许在不强制转换的情况下获取节点长度。
这是代码：
export type CountingState = {
countBeforeNode: number;
offsetInNode: number;
node?: Text; // Always of Text type
};
export type RangeOffsets = {
start: CountingState;
end: CountingState;
offsets: { start: number; end: number; }
};
export function isTextNode(node: Node): node is Text {
return node.nodeType === Node.TEXT_NODE;
}
export function getCaretPosition(container: Node): RangeOffsets | undefined {
const selection = window.getSelection();
if (!selection || selection.rangeCount === 0) { return undefined; }
const range = selection.getRangeAt(0);
const start = countUntilEndNode(container, range.startContainer as Text, range.startOffset);
const end = range.collapsed ? start : countUntilEndNode(container, range.endContainer as Text, range.endOffset);
const offsets = { start: start.countBeforeNode + start.offsetInNode, end: end.countBeforeNode + end.offsetInNode };
const rangeOffsets: RangeOffsets = { start, end, offsets };
return rangeOffsets;
}
export function setCaretPosition(container: Node, start: number, end: number): boolean {
const selection = window.getSelection();
if (!selection) { return false; }
const startState = countUntilOffset(container, start);
const endState = start === end ? startState : countUntilOffset(container, end);
const range = document.createRange(); // new Range() doesn't work for me!
range.setStart(startState.node!, startState.offsetInNode);
range.setEnd(endState.node!, endState.offsetInNode);
selection.removeAllRanges();
selection.addRange(range);
return true;
}
function countUntilEndNode(
parent: Node,
endNode: Text,
offset: number,
countingState: CountingState = { countBeforeNode: 0, offsetInNode: 0 },
): CountingState {
const treeWalker = document.createTreeWalker(parent, NodeFilter.SHOW_TEXT);
while (treeWalker.nextNode()) {
const node = treeWalker.currentNode as Text;
if (node === endNode) {
// We found the target node, memorize it.
countingState.node = node;
countingState.offsetInNode = offset;
break;
}
// Add length of text nodes found in the way, until we find the target node.
countingState.countBeforeNode += node.length;
}
return countingState;
}
function countUntilOffset(
parent: Node,
offset: number,
countingState: CountingState = { countBeforeNode: 0, offsetInNode: 0 },
): CountingState {
const treeWalker = document.createTreeWalker(parent, NodeFilter.SHOW_TEXT);
while (treeWalker.nextNode()) {
const node = treeWalker.currentNode as Text;
if (countingState.countBeforeNode <= offset && offset < countingState.countBeforeNode + node.length) {
countingState.offsetInNode = offset - countingState.countBeforeNode;
countingState.node = node;
break;
}
countingState.countBeforeNode += node.length;
}
return countingState;
}
这个答案适用于嵌套文本元素，使用递归函数。
奖励：将插入符号位置设置为保存位置。
function getCaretData(elem) {
var sel = window.getSelection();
return [sel.anchorNode, sel.anchorOffset];
}
function setCaret(el, pos) {
var range = document.createRange();
var sel = window.getSelection();
range.setStart(el,pos);
range.collapse(true);
sel.removeAllRanges();
sel.addRange(range);
}
let indexStack = [];
function checkParent(elem) {
let parent = elem.parentNode;
let parentChildren = Array.from(parent.childNodes);
let elemIndex = parentChildren.indexOf(elem);
indexStack.unshift(elemIndex);
if (parent !== cd) {
checkParent(parent);
} else {
return;
}
}
let stackPos = 0;
let elemToSelect;
function getChild(parent, index) {
let child = parent.childNodes[index];
if (stackPos < indexStack.length-1) {
stackPos++;
getChild(child, indexStack[stackPos]);
} else {
elemToSelect = child;
return;
}
}
let cd = document.querySelector('.cd'),
caretpos = document.querySelector('.caretpos');
cd.addEventListener('keyup', () => {
let caretData = getCaretData(cd);
let selectedElem = caretData[0];
let caretPos = caretData[1];
indexStack = [];
checkParent(selectedElem);
cd.innerHTML = 'Hello world! <span>Inline! <span>In inline!</span></span>';
stackPos = 0;
getChild(cd, indexStack[stackPos]);
setCaret(elemToSelect, caretPos);
caretpos.innerText = 'indexStack: ' + indexStack + '. Got child: ' + elemToSelect.data + '. Moved caret to child at pos: ' + caretPos;
}).cd, .caretpos {
font-family: system-ui, Segoe UI, sans-serif;
padding: 10px;
}
.cd span {
display: inline-block;
color: purple;
padding: 5px;
}
.cd span span {
color: chocolate;
padding: 3px;
}
:is(.cd, .cd span):hover {
border-radius: 3px;
box-shadow: inset 0 0 0 2px #005ecc;
}<div class="cd" contenteditable="true">Hello world! <span>Inline! <span>In inline!</span></span></div>
<div class="caretpos">Move your caret inside the elements above ⤴</div>