限制输入框仅数字JS实现-优快云博客

本文介绍了一种使用JavaScript实现的方法，该方法能够确保HTML输入框只接受数字输入，包括0-9的数字及特定符号如负号和小数点。通过简单的脚本和事件监听，可以有效控制用户输入，适用于需要精确数值输入的应用场景。

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/*
        **@控制控件只能输入数字,含-(负号).(小数点)
        **@Inline HTML: <ELEMENT  ... onkeypress="javascript:onlyNumber()" style="ime-mode:disabled"> For Input
        **@Event property: object.attachEvent("onkeypress",onlyNumber);object.style.imeMode = "disabled";
        **@Author:wangwq@atools
        */
        function onlyNumber(){
                if(!(((window.event.keyCode >= 48) && (window.event.keyCode <= 57))
                        || (window.event.keyCode == 13) || (window.event.keyCode == 46)
                        || (window.event.keyCode == 45))){
                        window.event.keyCode = 0 ;
                }
        }
        // ================================================================
        // 本函数用于限制文本输入框中只能输入数字"0"到"9"
        //@Inline HTML: <ELEMENT  ... onkeypress="javascript:JHshNumberText()" style="ime-mode:disabled"> For Input
        //@Event property: object.attachEvent("onkeypress",JHshNumberText);object.style.imeMode = "disabled";
        // ================================================================
        function JHshNumberText()
        {
                if ( !(((window.event.keyCode >= 48) && (window.event.keyCode <= 57)) || (window.event.keyCode == 13)))
                {
                        window.event.keyCode = 0 ;
                }
        }
========================================================================================
<input name="aa" type="text"  onkeypress="javascript:JHshNumberText()" style="ime-mode:disabled" ondragenter="javascript:return false;" onpaste="return false">

JS关于输入数字验证