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文本域光标操作(选、添、删、取)的jQuery扩展

; (function ($) {            /*             * 文本域光标操作(选、添、删、取)的jQuery扩展 @Mr.Think http://mrthink.net/text-field-jquery-extend/             */            $.fn.extend({                /*                 * 获取光标所在位置                 */                iGetFieldPos: function () {                    var field = this.get(0);                    if (document.selection) {                        //IE                        $(this).focus();                        var sel = document.selection;                        var range = sel.createRange();                        var dupRange = range.duplicate();                        dupRange.moveToElementText(field);                        dupRange.setEndPoint(‘EndToEnd‘, range);                        field.selectionStart = dupRange.text.length - range.text.length;                        field.selectionEnd = field.selectionStart + range.text.length;                    }                    return field.selectionStart;                },                /*                 * 选中指定位置内字符 || 设置光标位置                 * --- 从start起选中(含第start个),到第end结束(不含第end个)                 * --- 若不输入end值,即为设置光标的位置(第start字符后)                 */                iSelectField: function (start, end) {                    var field = this.get(0);                    //end未定义,则为设置光标位置                    if (arguments[1] == undefined) {                        end = start;                    }                    if (document.selection) {                        //IE                        var range = field.createTextRange();                        range.moveEnd(‘character‘, -$(this).val().length);                        range.moveEnd(‘character‘, end);                        range.moveStart(‘character‘, start);                        range.select();                    } else {                        //非IE                        field.setSelectionRange(start, end);                        $(this).focus();                    }                },                /*                 * 选中指定字符串                 */                iSelectStr: function (str) {                    var field = this.get(0);                    var i = $(this).val().indexOf(str);                    i != -1 ? $(this).iSelectField(i, i + str.length) : false;                },                /*                 * 在光标之后插入字符串                 */                iAddField: function (str) {                    var field = this.get(0);                    var v = $(this).val();                    var len = $(this).val().length;                    if (document.selection) {                        //IE                        $(this).focus()                        document.selection.createRange().text = str;                    } else {                        //非IE                        var selPos = field.selectionStart;                        $(this).val($(this).val().slice(0, field.selectionStart) + str + $(this).val().slice(field.selectionStart, len));                        this.iSelectField(selPos + str.length);                    };                },                /*                 * 删除光标前面(-)或者后面(+)的n个字符                 */                iDelField: function (n) {                    var field = this.get(0);                    var pos = $(this).iGetFieldPos();                    var v = $(this).val();                    //大于0则删除后面,小于0则删除前面                    $(this).val(n > 0 ? v.slice(0, pos - n) + v.slice(pos) : v.slice(0, pos) + v.slice(pos - n));                    $(this).iSelectField(pos - (n < 0 ? 0 : n));                }            });        })(jQuery);

应用场景

<!DOCTYPE html><html><head>    <title>无标题页</title>    <script type="text/javascript" src="http://sy.zgsapt.com/js/jquery-1.7.2.min.js"></script>    <script type="text/javascript">        ; (function ($) {            /*             * 文本域光标操作(选、添、删、取)的jQuery扩展 @Mr.Think http://mrthink.net/text-field-jquery-extend/             */            $.fn.extend({                /*                 * 获取光标所在位置                 */                iGetFieldPos: function () {                    var field = this.get(0);                    if (document.selection) {                        //IE                        $(this).focus();                        var sel = document.selection;                        var range = sel.createRange();                        var dupRange = range.duplicate();                        dupRange.moveToElementText(field);                        dupRange.setEndPoint(EndToEnd, range);                        field.selectionStart = dupRange.text.length - range.text.length;                        field.selectionEnd = field.selectionStart + range.text.length;                    }                    return field.selectionStart;                },                /*                 * 选中指定位置内字符 || 设置光标位置                 * --- 从start起选中(含第start个),到第end结束(不含第end个)                 * --- 若不输入end值,即为设置光标的位置(第start字符后)                 */                iSelectField: function (start, end) {                    var field = this.get(0);                    //end未定义,则为设置光标位置                    if (arguments[1] == undefined) {                        end = start;                    }                    if (document.selection) {                        //IE                        var range = field.createTextRange();                        range.moveEnd(character, -$(this).val().length);                        range.moveEnd(character, end);                        range.moveStart(character, start);                        range.select();                    } else {                        //非IE                        field.setSelectionRange(start, end);                        $(this).focus();                    }                },                /*                 * 选中指定字符串                 */                iSelectStr: function (str) {                    var field = this.get(0);                    var i = $(this).val().indexOf(str);                    i != -1 ? $(this).iSelectField(i, i + str.length) : false;                },                /*                 * 在光标之后插入字符串                 */                iAddField: function (str) {                    var field = this.get(0);                    var v = $(this).val();                    var len = $(this).val().length;                    if (document.selection) {                        //IE                        $(this).focus()                        document.selection.createRange().text = str;                    } else {                        //非IE                        var selPos = field.selectionStart;                        $(this).val($(this).val().slice(0, field.selectionStart) + str + $(this).val().slice(field.selectionStart, len));                        this.iSelectField(selPos + str.length);                    };                },                /*                 * 删除光标前面(-)或者后面(+)的n个字符                 */                iDelField: function (n) {                    var field = this.get(0);                    var pos = $(this).iGetFieldPos();                    var v = $(this).val();                    //大于0则删除后面,小于0则删除前面                    $(this).val(n > 0 ? v.slice(0, pos - n) + v.slice(pos) : v.slice(0, pos) + v.slice(pos - n));                    $(this).iSelectField(pos - (n < 0 ? 0 : n));                }            });        })(jQuery);        $(document).ready(function () {            $("#numd").bind("mouseleave", function () {                document.getElementById(keybored).style.display = none;                document.getElementById(Nm).blur();            });            $("#Nm").focus(function () {                document.getElementById(keybored).style.display = ‘‘;            });            $(".readbtns").click(function () {                $("#Nm").iAddField($(this).val());            });            $(".returns").click(function () {                $("#Nm").iDelField(1);            });        });    </script></head><body>    <ul>        <li>            <input />            <div>            </div>        </li>    </ul>    <input id="hid" type="text" value="" style="display: none" />    <span id="numd" style="border: 1px solid red; clear: both; display: inline-block; font: 800em;">        <input type="text" id="Nm" name="Nm" value="" />        <div style="display: none; border: 1px solid #A2B4C6; width: 150px; height: 400px;"            id="keybored">            <input type="button" class="readbtns" value="1" />            <input type="button" class="readbtns" value="2" />            <input type="button" class="readbtns" value="3" />            <input type="button" class="readbtns" value="4" />            <input type="button" class="readbtns" value="5" />            <input type="button" class="readbtns" value="6" />            <input type="button" class="readbtns" value="7" />            <input type="button" class="readbtns" value="8" />            <input type="button" class="readbtns" value="9" />            <input type="button" class="returns" value="<<---" />        </div>    </span></body></html>

 经过查阅jQuery的hover

$(‘#hover_div‘).hover(function(){/* something to do on mouseenter */},function(){/* something to do on mouseleave */});

所以上面的bind("mouseleave")完全可以用hover函数

 $("#numd").hover(function () {                document.getElementById(‘keybored‘).style.display = ‘‘;            }, function () {                document.getElementById(‘keybored‘).style.display = ‘none‘;                document.getElementById(‘Nm‘).blur();            });