我有这个contentedittable div
<div contenteditable="true" id="text">minubyv<img src="images/smiley/Emoji Smiley-01.png" class="emojiText" />iubyvt</div>
所以我想获得div的插入位置,并假设光标位于最后一个字符之后。这是我获得插入位置的代码
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;
}
var update = function() {
console.log(getCaretPosition(this));
};
$('#text').on("mousedown mouseup keydown keyup", update);
但问题是它返回6
而不是14
。插入符号位置在图像后返回0
。在这种情况下,我有办法让插入符号位置为14
。
修改
我还想从插入符号位置开始插入一些元素。所以这是我的功能
selectStart = 0;
var update = function() {
selectStart = getCaretPosition(this);
};
function insertEmoji(svg){
input = $('div#text').html();
beforeCursor = input.substring(0, selectStart);
afterCursor = input.substring(selectStart, input.length);
emoji = '<img src="images/smiley/'+svg+'.png" class="emojiText" />';
$('div#text').html(beforeCursor+emoji+afterCursor);
}
答案 0 :(得分:8)
请参阅Tim Down's上的Get a range's start and end offset's relative to its parent container回答。
尝试使用他拥有的函数来获取具有嵌套元素的选择索引,如下所示:
function getCaretCharacterOffsetWithin(element) {
var caretOffset = 0;
var doc = element.ownerDocument || element.document;
var win = doc.defaultView || doc.parentWindow;
var sel;
if (typeof win.getSelection != "undefined") {
sel = win.getSelection();
if (sel.rangeCount > 0) {
var range = win.getSelection().getRangeAt(0);
var preCaretRange = range.cloneRange();
preCaretRange.selectNodeContents(element);
preCaretRange.setEnd(range.endContainer, range.endOffset);
caretOffset = preCaretRange.toString().length;
}
} else if ( (sel = doc.selection) && sel.type != "Control") {
var textRange = sel.createRange();
var preCaretTextRange = doc.body.createTextRange();
preCaretTextRange.moveToElementText(element);
preCaretTextRange.setEndPoint("EndToEnd", textRange);
caretOffset = preCaretTextRange.text.length;
}
return caretOffset;
}
var update = function() {
console.log(getCaretCharacterOffsetWithin(this));
};
$('#text').on("mousedown mouseup keydown keyup", update);
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div contenteditable="true" id="text">minubyv<img src="https://themeforest.net/images/smileys/happy.png" class="emojiText" />iubyvt</div>
&#13;
我根据Tim Down编写了自己的功能,它的工作方式与你想要的一样。我将treeWalker
更改为NodeFilter.ELEMENT_NODE
的{{1}}过滤器,现在NodeFilter.SHOW_TEXT
元素也会在循环中处理。我首先存储<img/>
,然后递归所有选择树节点。如果它找到range.startOffset
节点,则它只向该位置添加1;如果当前节点元素与我们的img
不同,则它会添加该节点的长度。该位置由另一个变量range.startContainer
更改,该变量在每个循环中添加到lastNodeLength
。最后,当它存在于循环中时,它会将charCount
中剩余的内容添加到lastNodeLength
,并且我们拥有正确的最终插入位置,包括图像元素。
最终工作代码 (最后返回14,完全按照您应该的方式返回)
charCount
&#13;
function getCharacterOffsetWithin_final(range, node) {
var treeWalker = document.createTreeWalker(
node,
NodeFilter.ELEMENT_NODE,
function(node) {
var nodeRange = document.createRange();
nodeRange.selectNodeContents(node);
return nodeRange.compareBoundaryPoints(Range.END_TO_END, range) < 1 ?
NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_REJECT;
},
false
);
var charCount = 0, lastNodeLength = 0;
if (range.startContainer.nodeType == 3) {
charCount += range.startOffset;
}
while (treeWalker.nextNode()) {
charCount += lastNodeLength;
lastNodeLength = 0;
if(range.startContainer != treeWalker.currentNode) {
if(treeWalker.currentNode instanceof Text) {
lastNodeLength += treeWalker.currentNode.length;
} else if(treeWalker.currentNode instanceof HTMLBRElement ||
treeWalker.currentNode instanceof HTMLImageElement /* ||
treeWalker.currentNode instanceof HTMLDivElement*/)
{
lastNodeLength++;
}
}
}
return charCount + lastNodeLength;
}
var update = function() {
var el = document.getElementById("text");
var range = window.getSelection().getRangeAt(0);
console.log("Caret pos: " + getCharacterOffsetWithin_final(range, el))
};
$('#text').on("mouseup keyup", update);
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