Question

我想做年度验证，它应该只是数字，它应该是4位数长，在1920年到当年之间我已经创建了java脚本函数，如下所示

function yearValidation(year) {
    var text = /^[0-9]+$/;
    if (year != 0) {
        if ((year != "") && (!text.test(year))) {

            alert("Please Enter Numeric Values Only");
            return false;
        }

        if (year.length != 4) {
            alert("Year is not proper. Please check");
            return false;
        }
        var current_year=new Date().getFullYear();
        if((year < 1920) || (year > current_year))
            {
            alert("Year should be in range 1920 to current year");
            return false;
            }
        return true;
    }

并在onkeypress="return yearValidation(this.value)"

上调用它

但是当我输入1时，它会给我提醒Year should be in range 1920 to current year

Answer 1

应用两个事件应该可以解决问题 HTML：

    <input type="text" 
        onblur="yearValidation(this.value,event)" 
        onkeypress="yearValidation(this.value,event)"
    >

JS：

function yearValidation(year,ev) {

  var text = /^[0-9]+$/;
  if(ev.type=="blur" || year.length==4 && ev.keyCode!=8 && ev.keyCode!=46) {
    if (year != 0) {
        if ((year != "") && (!text.test(year))) {

            alert("Please Enter Numeric Values Only");
            return false;
        }

        if (year.length != 4) {
            alert("Year is not proper. Please check");
            return false;
        }
        var current_year=new Date().getFullYear();
        if((year < 1920) || (year > current_year))
            {
            alert("Year should be in range 1920 to current year");
            return false;
            }
        return true;
    } }
}

Answer 2

猜猜是：

 if (year.length < 4) {

不是

if (year.length != 4) {

Answer 3

或直接以表单

<input name="date_check" 
type="text" 
title="Date must be in this case:dd.mm.yy" 
pattern="^[0-9]{1,2}\.[0-9]{2}$" />

Javascript中的年份验证

3 个答案: