Question

怎么给javascript + div编辑框光标位置插入表情文字等

Answer 1

代码1：div 设置contenteditable等于true作为编辑框时的光标位置插入文本

/**
*光标位置插入
* 参数1 string 要插入的内容
* 参数2 bool true 插入后选中插入内容，false不选中
**/function pasteHtmlAtCaret(html, selectPastedContent) {
var sel, range;
if (window.getSelection) {
// IE9 and non-IE
sel = window.getSelection();
if (sel.getRangeAt && sel.rangeCount) {
range = sel.getRangeAt(0);
range.deleteContents();

// Range.createContextualFragment() would be useful here but is
// only relatively recently standardized and is not supported in
// some browsers (IE9, for one)
var el = document.createElement("div");
el.innerHTML = html;
var frag = document.createDocumentFragment(), node, lastNode;
while ( (node = el.firstChild) ) {
lastNode = frag.appendChild(node);
}
var firstNode = frag.firstChild;
range.insertNode(frag);

// Preserve the selection
if (lastNode) {
range = range.cloneRange();
range.setStartAfter(lastNode);
if (selectPastedContent) {
range.setStartBefore(firstNode);
} else {
range.collapse(true);
}
sel.removeAllRanges();
sel.addRange(range);
}
}
} else if ( (sel = document.selection) && sel.type != "Control") {
// IE < 9
var originalRange = sel.createRange();
originalRange.collapse(true);
sel.createRange().pasteHTML(html);
if (selectPastedContent) {
range = sel.createRange();
range.setEndPoint("StartToStart", originalRange);
range.select();
}
}
}

代码2：textarea 光标位置插入文本

//JQ 扩展
(function ($) {
$.fn.extend({
insertAtCaret: function (myValue) {
var $t = $(this)[0];
if (document.selection) {
this.focus();
sel = document.selection.createRange();
sel.text = myValue;
this.focus();
} else{
if ($t.selectionStart || $t.selectionStart == '0') {
var startPos = $t.selectionStart;
var endPos = $t.selectionEnd;
var scrollTop = $t.scrollTop;
$t.value = $t.value.substring(0, startPos) + myValue + $t.value.substring(endPos, $t.value.length);
this.focus();
$t.selectionStart = startPos + myValue.length;
$t.selectionEnd = startPos + myValue.length;
$t.scrollTop = scrollTop;
} else {
this.value += myValue;
this.focus();
}
}
}
});
})(jQuery);