[转载]jQuery 输入框 在光标位置插入内容, 并选中

//

//使用方法

//$(文本域选择器).insertContent("插入的内容");

//$(文本域选择器).insertContent("插入的内容"，数值); //根据数值选中插入文本内容两边的边界, 数值: 0是表示插入文字全部选择，-1表示插入文字两边各少选中一个字符。

//

//在光标位置插入内容, 并选中

(function($) {

    $.fn.extend({

        insertContent: function(myValue, t) {

            var $t = $(this)[0];

            if (document.selection) { //ie

                this.focus();

                var sel = document.selection.createRange();

                sel.text = myValue;

                this.focus();

                sel.moveStart('character', -l);

                var wee = sel.text.length;

                if (arguments.length == 2) {

                    var l = $t.value.length;

                    sel.moveEnd("character", wee + t);

                    t <= 0 ? sel.moveStart("character", wee - 2 * t - myValue.length) : sel.moveStart("character", wee - t - myValue.length);

   

                    sel.select();

                }

            } 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;

                if (arguments.length == 2) {

                    $t.setSelectionRange(startPos - t, $t.selectionEnd + t);

                    this.focus();

                }

            }

            else {

                this.value += myValue;

                this.focus();

            }

        }

    })

})(jQuery);