我有一个简单的HTML作为例子:
<div id="editable" contenteditable="true">
text text text<br>
text text text<br>
text text text<br>
</div>
<button id="button">focus</button>
我想要简单的东西-当我点击按钮时，我想在可编辑的div中放置插入符号(光标)到特定的地方。从网上搜索，我有这个JS附加到按钮点击，但它不起作用(FF, Chrome):
const range = document.createRange();
const myDiv = document.getElementById("editable");
range.setStart(myDiv, 5);
range.setEnd(myDiv, 5);
是否可以像这样手动设置插入符号的位置?
当前回答
如果你不想使用jQuery，你可以试试这个方法:
public setCaretPosition() {
const editableDiv = document.getElementById('contenteditablediv');
const lastLine = this.input.nativeElement.innerHTML.replace(/.*?(<br>)/g, '');
const selection = window.getSelection();
selection.collapse(editableDiv.childNodes[editableDiv.childNodes.length - 1], lastLine.length);
}
editableDiv你的可编辑元素，不要忘记为它设置一个id。然后你需要从元素中获取innerHTML并切断所有刹车线。然后用next参数设置collapse。
其他回答
在大多数浏览器中，都需要Range和Selection对象。将每个选择边界指定为一个节点，并在该节点中指定偏移量。例如，要将插入符号设置为第二行文本的第五个字符，您可以执行以下操作:
function setCaret() var el =文档。getElementById(“编辑”) 咖啡壶。 var = window.getSelection() 太阳城setStart (el。childNodes [2], 5) 太阳城崩溃(真正的)。 细胞removeAllRanges()。 细胞addRange(射程)。 的 <div id=“编辑”contenteble =“真”> 文本文本<br>文本文本<br>文本文本<br> < / div > <巴顿id=“巴顿”onclick=“setCaret”()巴顿”focus > < - >
IE < 9的工作方式完全不同。如果需要支持这些浏览器，则需要不同的代码。
jsFiddle示例:http://jsfiddle.net/timdown/vXnCM/
const el = document.getElementById("editable");
el.focus()
let char = 1, sel; // character at which to place caret
if (document.selection) {
sel = document.selection.createRange();
sel.moveStart('character', char);
sel.select();
}
else {
sel = window.getSelection();
sel.collapse(el.lastChild, char);
}
我正在编写一个语法高亮显示(和基本的代码编辑器)，我需要知道如何自动键入一个单引号字符并将插入符号移回(就像现在的许多代码编辑器一样)。
这里是我的解决方案的一个片段，感谢来自这个线程的帮助，MDN文档，和很多moz控制台观看。
//onKeyPress event
if (evt.key === "\"") {
let sel = window.getSelection();
let offset = sel.focusOffset;
let focus = sel.focusNode;
focus.textContent += "\""; //setting div's innerText directly creates new
//nodes, which invalidate our selections, so we modify the focusNode directly
let range = document.createRange();
range.selectNode(focus);
range.setStart(focus, offset);
range.collapse(true);
sel.removeAllRanges();
sel.addRange(range);
}
//end onKeyPress event
这是一个可满足内容的div元素
我把这个留在这里作为感谢，意识到已经有一个公认的答案。
我为我的简单文本编辑器做了这个。
与其他方法的区别:
高性能 适用于所有空间
使用
// get current selection
const [start, end] = getSelectionOffset(container)
// change container html
container.innerHTML = newHtml
// restore selection
setSelectionOffset(container, start, end)
// use this instead innerText for get text with keep all spaces
const innerText = getInnerText(container)
const textBeforeCaret = innerText.substring(0, start)
const textAfterCaret = innerText.substring(start)
selection.ts
/** return true if node found */
function searchNode(
container: Node,
startNode: Node,
predicate: (node: Node) => boolean,
excludeSibling?: boolean,
): boolean {
if (predicate(startNode as Text)) {
return true
}
for (let i = 0, len = startNode.childNodes.length; i < len; i++) {
if (searchNode(startNode, startNode.childNodes[i], predicate, true)) {
return true
}
}
if (!excludeSibling) {
let parentNode = startNode
while (parentNode && parentNode !== container) {
let nextSibling = parentNode.nextSibling
while (nextSibling) {
if (searchNode(container, nextSibling, predicate, true)) {
return true
}
nextSibling = nextSibling.nextSibling
}
parentNode = parentNode.parentNode
}
}
return false
}
function createRange(container: Node, start: number, end: number): Range {
let startNode
searchNode(container, container, node => {
if (node.nodeType === Node.TEXT_NODE) {
const dataLength = (node as Text).data.length
if (start <= dataLength) {
startNode = node
return true
}
start -= dataLength
end -= dataLength
return false
}
})
let endNode
if (startNode) {
searchNode(container, startNode, node => {
if (node.nodeType === Node.TEXT_NODE) {
const dataLength = (node as Text).data.length
if (end <= dataLength) {
endNode = node
return true
}
end -= dataLength
return false
}
})
}
const range = document.createRange()
if (startNode) {
if (start < startNode.data.length) {
range.setStart(startNode, start)
} else {
range.setStartAfter(startNode)
}
} else {
if (start === 0) {
range.setStart(container, 0)
} else {
range.setStartAfter(container)
}
}
if (endNode) {
if (end < endNode.data.length) {
range.setEnd(endNode, end)
} else {
range.setEndAfter(endNode)
}
} else {
if (end === 0) {
range.setEnd(container, 0)
} else {
range.setEndAfter(container)
}
}
return range
}
export function setSelectionOffset(node: Node, start: number, end: number) {
const range = createRange(node, start, end)
const selection = window.getSelection()
selection.removeAllRanges()
selection.addRange(range)
}
function hasChild(container: Node, node: Node): boolean {
while (node) {
if (node === container) {
return true
}
node = node.parentNode
}
return false
}
function getAbsoluteOffset(container: Node, offset: number) {
if (container.nodeType === Node.TEXT_NODE) {
return offset
}
let absoluteOffset = 0
for (let i = 0, len = Math.min(container.childNodes.length, offset); i < len; i++) {
const childNode = container.childNodes[i]
searchNode(childNode, childNode, node => {
if (node.nodeType === Node.TEXT_NODE) {
absoluteOffset += (node as Text).data.length
}
return false
})
}
return absoluteOffset
}
export function getSelectionOffset(container: Node): [number, number] {
let start = 0
let end = 0
const selection = window.getSelection()
for (let i = 0, len = selection.rangeCount; i < len; i++) {
const range = selection.getRangeAt(i)
if (range.intersectsNode(container)) {
const startNode = range.startContainer
searchNode(container, container, node => {
if (startNode === node) {
start += getAbsoluteOffset(node, range.startOffset)
return true
}
const dataLength = node.nodeType === Node.TEXT_NODE
? (node as Text).data.length
: 0
start += dataLength
end += dataLength
return false
})
const endNode = range.endContainer
searchNode(container, startNode, node => {
if (endNode === node) {
end += getAbsoluteOffset(node, range.endOffset)
return true
}
const dataLength = node.nodeType === Node.TEXT_NODE
? (node as Text).data.length
: 0
end += dataLength
return false
})
break
}
}
return [start, end]
}
export function getInnerText(container: Node) {
const buffer = []
searchNode(container, container, node => {
if (node.nodeType === Node.TEXT_NODE) {
buffer.push((node as Text).data)
}
return false
})
return buffer.join('')
}
function set_mouse() { var as = document.getElementById("editable"); el = as.childNodes[1].childNodes[0]; //goal is to get ('we') id to write (object Text) because it work only in object text var range = document.createRange(); var sel = window.getSelection(); range.setStart(el, 1); range.collapse(true); sel.removeAllRanges(); sel.addRange(range); document.getElementById("we").innerHTML = el; // see out put of we id } <div id="editable" contenteditable="true">dddddddddddddddddddddddddddd <p>dd</p>psss <p>dd</p> <p>dd</p> <p>text text text</p> </div> <p id='we'></p> <button onclick="set_mouse()">focus</button>
当你有(p) (span)等高级元素时，将插入符号设置在合适的位置是非常困难的。目标是获取(对象文本):
<div id="editable" contenteditable="true">dddddddddddddddddddddddddddd<p>dd</p>psss<p>dd</p>
<p>dd</p>
<p>text text text</p>
</div>
<p id='we'></p>
<button onclick="set_mouse()">focus</button>
<script>
function set_mouse() {
var as = document.getElementById("editable");
el = as.childNodes[1].childNodes[0];//goal is to get ('we') id to write (object Text) because it work only in object text
var range = document.createRange();
var sel = window.getSelection();
range.setStart(el, 1);
range.collapse(true);
sel.removeAllRanges();
sel.addRange(range);
document.getElementById("we").innerHTML = el;// see out put of we id
}
</script>
