[英]Set caret to nearest possible position based on an x and y coordinate
[英]Set textarea's caret position using x and y position
我要實現內聯編輯,因此,如果用戶單擊帶有某些文本的div,則textarea將顯示在與單擊的div位置相同的位置,並將從div獲取文本。 這對我來說很好,但是接下來要做的是根據div click事件中的x和y位置設置textarea的插入符位置。 有任何想法嗎?
HTML:
<div id="content" style="display: block; z-index: 10">Some text</div>
<textarea id="editor" style="position: absolute; display: none; z-index: 11"></textarea>
JS:
$('#content').click(function(e) {
var content = $(this);
var editor = $('#editor');
var position = content.offset();
editor.css('left', position.left);
editor.css('top', position.top);
editor.val(content.text());
editor.show();
var mousePosition = { x: e.offsetX, y: e.offsetY };
// here I want to set the #editor caret position at the same place,
// where user clicks the #content (mousePosition variable)
});
看起來您可以執行以下操作:
createTextArea = function (e) {
var range = window.getSelection().getRangeAt(0),
start = range.startOffset,
target = e.target,
setPoint;
while (target.tagName.toLowerCase() !== 'div') {
target = target.parentElement;
if (!target) return;
}
range.setStart(target, 0);
setPoint = range.toString().length;
// place and show #editor
editor.focus();
editor.setSelectionRange(setPoint, setPoint);
return;
};
jsFiddle的示例 。 請注意,這僅在現代瀏覽器中有效。 較舊的IE沒有Input API,而Selection / Range模型則完全不同。
我找到了一個解決方案:
JS:
function getCaretPosition(editableDiv) {
var caretPos = 0, containerEl = null, 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;
}
$.fn.selectRange = function (start, end) {
if (!end) end = start;
return this.each(function () {
if (this.setSelectionRange) {
this.focus();
this.setSelectionRange(start, end);
} else if (this.createTextRange) {
var range = this.createTextRange();
range.collapse(true);
range.moveEnd('character', end);
range.moveStart('character', start);
range.select();
}
});
};
用法:
$('#content').click(function (e) {
var content = $(this);
var editor = $('#editor');
var caret = getCaretPosition(this);
var position = content.offset();
editor.css('left', position.left);
editor.css('top', position.top);
editor.val(content.text());
editor.show();
var mousePosition = { x: e.offsetX, y: e.offsetY };
// here I want to set the #editor caret position at the same place,
// where user clicks the #content (mousePosition variable)
editor.selectRange(caret, caret);
});
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