我需要將插入符號移動到contenteditable
節點的末尾,就像在Gmail便箋小部件上一樣。如何將光標移動到可用實體的結尾
我在StackOverflow上讀取線程,但這些解決方案基於使用輸入,並且它們不適用於contenteditable
元素。
我需要將插入符號移動到contenteditable
節點的末尾,就像在Gmail便箋小部件上一樣。如何將光標移動到可用實體的結尾
我在StackOverflow上讀取線程,但這些解決方案基於使用輸入,並且它們不適用於contenteditable
元素。
也有另一種問題。
如果contenteditable
div不包含其他多線元素,則Nico Burns的解決方案有效。
例如,如果div包含其他div,並且這些其他div包含其他內容,則可能會發生一些問題。
爲了解決這些問題,我已經安排了以下解決方案,這是一個改善Nico的一個:
//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);
這種方式,遊標肯定位於最後一個元素的末尾,最終嵌套。
編輯#1:爲了更通用,while語句還應該考慮所有其他不能包含文本的標籤。這些元素被命名爲void元素,並且在this question中有一些關於如何測試元素是否爲空的方法。因此,假設存在一個名爲canContainText
函數,返回true
如果參數不是一個空元素,下面的代碼行:
canContainText(getLastChildElement(contentEditableElement))
EDIT#2:
contentEditableElement.lastChild.tagName.toLowerCase() != 'br'
應替換:上面的代碼是完全更新的,每個變化描述和討論
Geowa4的解決方案將適用於textarea,但不適用於contenteditable元素。
該解決方案用於將插入符號移動到contenteditable元素的末尾。它應該支持所有支持contenteditable的瀏覽器。
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
}
}
它可通過類似於代碼使用:
elem = document.getElementById('txt1');//This is the element that you want to move the caret to the end of
setEndOfContenteditable(elem);
可以將光標設置到範圍末端:
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;
}
你有辦法使這項工作在鉻? – Jason 2010-04-21 22:19:52
geowa4的解決方案將用於chrome中的textarea,它不適用於任何瀏覽器中的contenteditable元素。我的工作是爲了滿足自己的要素,但不是爲textareas。 – 2010-10-05 18:11:14
這是這個問題的正確答案,完美,謝謝尼科。 – Rob 2012-04-30 10:17:10