Question

我的注册表单中有一个密码字段。以下是javascript验证的代码。

if(document.getElementById('txtPassword').value == '' || document.getElementById('txtPassword').value == 'Password' ){
            alert("Please enter Password");
            document.getElementById('txtPassword').focus();
            return false;
        }


      else if (document.getElementById('txtPassword').value.length < 8)
       {
               alert('Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number');
               return false;
       }


      else if ( (! document.getElementById('txtPassword').value.match(/[a-z]/) ) || (! document.getElementById('txtPassword').value.match(/[A-Z]/) ) ) {
               alert('Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number');
               return false;
       }


      else if (!document.getElementById('txtPassword').value.match(/\d+/)) {
               alert('Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number');
               return false;
       }

        else if (document.getElementById('txtPassword').length < 8)
       {
               alert('Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number');
               return false;
       }

我需要检查单引号。如果用户在密码字段中输入单引号并点击输入错误“应该在此字段中避免单引号”。

怎么做？

Answer 1

else if (document.getElementById('txtPassword').value.indexOf("'") != -1) {
    alert("Avoid single quotes in this field");
    return false;
}

这是一个简单的测试用例。如果您创建一个html页面，将其放在head标签中，在浏览器中打开它，您会看到它有效：

var value1 = "abc'def";
var value2 = "abcdef";
if(value1.indexOf("'") != -1)
    alert(value1 + " contains a '");
else
    alert(value1 + " does not contain a '");
if(value2.indexOf("'") != -1)
    alert(value2 + " contains a '");
else
    alert(value2 + " does not contain a '");

Answer 2

使用此正则表达式进行密码检查

^(?=.*\d)(?=.*[a-zA-Z]).{8,}

目前，您正在进行大量验证检查，以避免仅使用上面的正则表达式。

if (! /^(?=.*\d)(?=.*[a-zA-Z]).{8,}/.test(txtPass)) {
    flag = false;
}
else if(txtPass.indexOf("'") != -1) {
    flag = false;
}

if (!flag)
    alert("Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number");

参考 LIVE DEMO

单引号的javascript验证

2 个答案: