只能输入数字的文本框

只能输入数字的文本框

1、核心js代码:

    /*************************************************
     * 只能输入正整数,不能有小数点
     */
    onlyIntegerKeyUp = function (e) {
        if (e === undefined) {
            e = window.event;
        }
        var obj = e.srcElement ? e.srcElement : e.target;
        var pattern = /[^\d]/ig;
        var val = obj.value;
        if (pattern.test(val)) {
            var i = getCursortPosition(e);
            obj.value = val.replace(pattern, ‘‘);
            setCaretPosition(e, i);
        }
    };
    /************************************************
     * 获取光标位置
     * @param ctrl
     * @returns {Number}
     */
    getCursortPosition = function (event) {// 获取光标位置函数
        if (event === undefined || event === null) {
            event = arguments.callee.caller.arguments[0] || window.event;
        }
        var obj = event.srcElement ? event.srcElement : event.target;
        var CaretPos = 0;   // IE Support
        if (document.selection) {
            obj.focus();
            var Sel = document.selection.createRange();
            Sel.moveStart(‘character‘, -obj.value.length);
            CaretPos = Sel.text.length;
        } else if (obj.selectionStart || obj.selectionStart == ‘0‘) {
            // Firefox support
            CaretPos = obj.selectionStart;
        }

        return (CaretPos);
    };

    /**********************************************
     * 设置光标位置
     * @param ctrl
     * @returns {Number}
     */
    setCaretPosition = function (event, pos) {// 设置光标位置函数
        if (event === undefined || event === null) {
            event = arguments.callee.caller.arguments[0] || window.event;
        }
        var obj = event.srcElement ? event.srcElement : event.target;
        if (pos > 0) {
            pos = pos - 1;//因为把不匹配的字符删除之后,光标会往后移动一个位置
        }
        if (obj.setSelectionRange) {
            obj.focus();
            obj.setSelectionRange(pos, pos);
        } else if (obj.createTextRange) {
            var range = obj.createTextRange();
            range.collapse(true);
            range.moveEnd(‘character‘, pos);
            range.moveStart(‘character‘, pos);
            range.select();
        }
    };
    /***
     * @param event
     * @returns {boolean}
     */
    onlyIntegerKeyPress = function onlyIntegerKeyPress(event) {
        event = event || window.event || arguments.callee.caller.arguments[0];
        //console.log(event);
        var charCode2;
        if (‘charCode‘ in event) {//IE7 and IE8 no charCode
            charCode2 = event.charCode;
        } else {
            //console.log(‘no charCode‘);
            charCode2 = event.keyCode;
        }
        //console.log(charCode2);
        if (event.keyCode === 8/*back*/ || event.keyCode === 13/*Enter*/ || event.keyCode === 9/*Tab*/ || event.keyCode === 37/*<- */ || event.keyCode === 39/* ->*/) {
            return true;
        } else if (charCode2 < 48 || charCode2 > 57) {/*0-9*/
            event.returnValue = false;
            return false;
        } else {
            return true;
        }
    };

页面代码:

<body>
    只能输入数字: <input type="text" style="ime-mode:disabled;" onkeyup="onlyIntegerKeyUp(event)"
                   onKeyPress="return onlyIntegerKeyPress(event)"/><br>
</body>

只能输入数字的文本框

Miss_Ye

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