我需要将插入符号移动到contenteditable
节点的末尾,就像在 Gmail 笔记小部件上一样。
我在 StackOverflow 上阅读了线程,但这些解决方案是基于使用输入的,它们不适用于contenteditable
元素。
我需要将插入符号移动到contenteditable
节点的末尾,就像在 Gmail 笔记小部件上一样。
我在 StackOverflow 上阅读了线程,但这些解决方案是基于使用输入的,它们不适用于contenteditable
元素。
Geowa4 的解决方案适用于 textarea,但不适用于 contenteditable 元素。
此解决方案用于将插入符号移动到 contenteditable 元素的末尾。它应该适用于所有支持 contenteditable 的浏览器。
function setEndOfContenteditable(contentEditableElement)
{
var range,selection;
if(document.createRange)//Firefox, Chrome, Opera, Safari, IE 9+
{
range = document.createRange();//Create a range (a range is a like the selection but invisible)
range.selectNodeContents(contentEditableElement);//Select the entire contents of the element with the range
range.collapse(false);//collapse the range to the end point. false means collapse to end rather than the start
selection = window.getSelection();//get the selection object (allows you to change selection)
selection.removeAllRanges();//remove any selections already made
selection.addRange(range);//make the range you have just created the visible selection
}
else if(document.selection)//IE 8 and lower
{
range = document.body.createTextRange();//Create a range (a range is a like the selection but invisible)
range.moveToElementText(contentEditableElement);//Select the entire contents of the element with the range
range.collapse(false);//collapse the range to the end point. false means collapse to end rather than the start
range.select();//Select the range (make it the visible selection
}
}
它可以被类似的代码使用:
elem = document.getElementById('txt1');//This is the element that you want to move the caret to the end of
setEndOfContenteditable(elem);
如果您不关心较旧的浏览器,那么这个对我有用。
// [optional] make sure focus is on the element
yourContentEditableElement.focus();
// select all the content in the element
document.execCommand('selectAll', false, null);
// collapse selection to the end
document.getSelection().collapseToEnd();
还有另一个问题。
如果div 不包含其他多行元素,则Nico Burns的解决方案有效。contenteditable
例如,如果一个 div 包含其他 div,而这些其他 div 包含其他内容,则可能会出现一些问题。
为了解决它们,我安排了以下解决方案,这是对Nico的改进:
//Namespace management idea from http://enterprisejquery.com/2010/10/how-good-c-habits-can-encourage-bad-javascript-habits-part-1/
(function( cursorManager ) {
//From: http://www.w3.org/TR/html-markup/syntax.html#syntax-elements
var voidNodeTags = ['AREA', 'BASE', 'BR', 'COL', 'EMBED', 'HR', 'IMG', 'INPUT', 'KEYGEN', 'LINK', 'MENUITEM', 'META', 'PARAM', 'SOURCE', 'TRACK', 'WBR', 'BASEFONT', 'BGSOUND', 'FRAME', 'ISINDEX'];
//From: https://stackoverflow.com/questions/237104/array-containsobj-in-javascript
Array.prototype.contains = function(obj) {
var i = this.length;
while (i--) {
if (this[i] === obj) {
return true;
}
}
return false;
}
//Basic idea from: https://stackoverflow.com/questions/19790442/test-if-an-element-can-contain-text
function canContainText(node) {
if(node.nodeType == 1) { //is an element node
return !voidNodeTags.contains(node.nodeName);
} else { //is not an element node
return false;
}
};
function getLastChildElement(el){
var lc = el.lastChild;
while(lc && lc.nodeType != 1) {
if(lc.previousSibling)
lc = lc.previousSibling;
else
break;
}
return lc;
}
//Based on Nico Burns's answer
cursorManager.setEndOfContenteditable = function(contentEditableElement)
{
while(getLastChildElement(contentEditableElement) &&
canContainText(getLastChildElement(contentEditableElement))) {
contentEditableElement = getLastChildElement(contentEditableElement);
}
var range,selection;
if(document.createRange)//Firefox, Chrome, Opera, Safari, IE 9+
{
range = document.createRange();//Create a range (a range is a like the selection but invisible)
range.selectNodeContents(contentEditableElement);//Select the entire contents of the element with the range
range.collapse(false);//collapse the range to the end point. false means collapse to end rather than the start
selection = window.getSelection();//get the selection object (allows you to change selection)
selection.removeAllRanges();//remove any selections already made
selection.addRange(range);//make the range you have just created the visible selection
}
else if(document.selection)//IE 8 and lower
{
range = document.body.createTextRange();//Create a range (a range is a like the selection but invisible)
range.moveToElementText(contentEditableElement);//Select the entire contents of the element with the range
range.collapse(false);//collapse the range to the end point. false means collapse to end rather than the start
range.select();//Select the range (make it the visible selection
}
}
}( window.cursorManager = window.cursorManager || {}));
用法:
var editableDiv = document.getElementById("my_contentEditableDiv");
cursorManager.setEndOfContenteditable(editableDiv);
这样,光标肯定会定位在最后一个元素的末尾,最终嵌套。
编辑#1:为了更通用,while 语句还应考虑所有其他不能包含文本的标签。这些元素被命名为void elements,在这个问题中,有一些方法可以测试元素是否为 void。因此,假设存在一个调用的函数,如果参数不是 void 元素则canContainText
返回,下面的代码行:true
contentEditableElement.lastChild.tagName.toLowerCase() != 'br'
应替换为:
canContainText(getLastChildElement(contentEditableElement))
编辑#2:上面的代码已经完全更新,每一个变化都被描述和讨论
可以通过范围将光标设置到末尾:
setCaretToEnd(target/*: HTMLDivElement*/) {
const range = document.createRange();
const sel = window.getSelection();
range.selectNodeContents(target);
range.collapse(false);
sel.removeAllRanges();
sel.addRange(range);
target.focus();
range.detach(); // optimization
// set scroll to the end if multiline
target.scrollTop = target.scrollHeight;
}
将光标移动到可编辑范围的末尾以响应焦点事件:
moveCursorToEnd(el){
if(el.innerText && document.createRange)
{
window.setTimeout(() =>
{
let selection = document.getSelection();
let range = document.createRange();
range.setStart(el.childNodes[0],el.innerText.length);
range.collapse(true);
selection.removeAllRanges();
selection.addRange(range);
}
,1);
}
}
并在事件处理程序中调用它(此处为 React):
onFocus={(e) => this.moveCursorToEnd(e.target)}}
我在尝试使元素可编辑时遇到了类似的问题。在 Chrome 和 FireFox 中是可能的,但在 FireFox 中,插入符号要么转到输入的开头,要么在输入结束后转到一个空格。我认为最终用户非常困惑,试图编辑内容。
我发现没有解决方案尝试了几件事。唯一对我有用的是通过在我的 . 现在它起作用了。似乎“内容可编辑”仍然是最前沿的技术,它可能会也可能不会像您希望的那样工作,具体取决于上下文。
当您最初开始输入时,问题contenteditable
<div>
和解决了。<span>
一种解决方法可能是在 div 元素和该函数上触发焦点事件,清除并重新填充 div 元素中已有的内容。这样问题就解决了,最后您可以使用范围和选择将光标放在末尾。为我工作。
moveCursorToEnd(e : any) {
let placeholderText = e.target.innerText;
e.target.innerText = '';
e.target.innerText = placeholderText;
if(e.target.innerText && document.createRange)
{
let range = document.createRange();
let selection = window.getSelection();
range.selectNodeContents(e.target);
range.setStart(e.target.firstChild,e.target.innerText.length);
range.setEnd(e.target.firstChild,e.target.innerText.length);
selection.removeAllRanges();
selection.addRange(range);
}
}
在 HTML 代码中:
<div contentEditable="true" (focus)="moveCursorToEnd($event)"></div>
selection
仅使用(不使用)的更短且可读的版本range
:
function setEndOfContenteditable(elem) {
let sel = window.getSelection()
sel.selectAllChildren(elem)
sel.collapseToEnd()
}
<p id="pdemo" contenteditable>
A paragraph <span id="txt1" style="background-color: #0903">span text node <i>span italic</i></span> a paragraph.
<p>
<button onclick="pdemo.focus(); setEndOfContenteditable(txt1)">set caret</button>