"不相等”;在Javascript表单验证中无法识别符号

"Not Equal" sign not recognised in Javascript Form Validation

本文关键字：识别 符号 验证 Javascript 不相等 quot 表单      更新时间：2023-09-26

有人能告诉我如何改进这个代码吗？最重要的是，对我的电子邮件验证进行排序，使其在Z不等于零或字符串"电子邮件"的所有情况下都能工作

所有字段都以适当的措辞开头，这些措辞已作为示例输入给客户。

提前致以亲切的问候。

function validateForm()
{
//Uses HTML field IDs
var x=document.forms["myForm"]["name"].value;
var y=document.forms["myForm"]["phone"].value;
var z=document.forms["myForm"]["email"].value;
//Name locator
    if (x==null || x=="" || x=="Name")
      {
      alert("Please enter the your name.");
      return false;
}
//Contact method locator
    if ((y==null || y=="" || y=="Phone Number")&&(z==null || z=="" || z=="Email"))
      {
      alert("Please enter a contact method.");
      return false;
}
//Phone numeric validation, this runs if Email field is not edited
    if (z==null || z=="" || z=="Email")
    {
    if (isNaN(y)||x.indexOf(" ")!=-1)
      {
      alert("Telephone must be a numeric value.");
      return false;
      }
}
//Phone length validation, this runs if Email field is not edited
    if (z==null || z=="" || z=="Email")
    {
    if (y.length > 14)
      {
      alert("Telephone must be valid.");
      return false;
        }
}
//Email validation, does not work, this should run only when something is entered into the field
    if (z!=null || z!="" || z!="Email")
    {
    var atpos=z.indexOf("@");
    var dotpos=z.lastIndexOf(".");
        if (atpos<1 || dotpos<atpos+2 || dotpos+2>=z.length)
      {
      alert("This is not a valid e-mail address");
      return false;
        }
    }
}

您可以做一些事情。

z==null || z==""可用!Boolean(z)或!z 代替

z!=null || z!=""可用Boolean(z)或!!z 代替

您还应该尝试始终使用===而不是===，除非您期望的类型强制。

因此，您对z == "Email"的检查可能会更改为类似于z.toLowerCase() === "email" 的内容

看起来您还重复了代码-->z==null || z=="" || z=="Email"（x2）。您可以将电话号码验证和电话长度验证相结合。

看看这个验证代码，它是jQuery和Javascript的组合。它将为您提供一些关于您应该寻找什么以及如何处理典型表单的特定元素的极好见解（包括GREAT RegEx电子邮件地址示例：

/^((([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+('.([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+)*)|(('x22)(((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?((['x01-'x08'x0b'x0c'x0e-'x1f'x7f]|'x21|['x23-'x5b]|['x5d-'x7e]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(''(['x01-'x09'x0b'x0c'x0d-'x7f]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF]))))*((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?('x22)))@((([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))'.)+(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))$/i.test(value)

更改：

if (z!=null || z!="" || z!="Email")

对此：

if (z!=null && z!="" && z!="Email")

你的验证应该都是AND和OR，因为你希望在提交之前所有这些都是真的。

您是否考虑过使用validate.js之类的东西，而不是手动编写表单验证？

示例代码：

var validator = new FormValidator('example_form', [{
    name: 'req',
    display: 'required',    
    rules: 'required'
}, {
    name: 'alphanumeric',
    rules: 'alpha_numeric'
}, {
    name: 'password',
    rules: 'required'
}, {
    name: 'password_confirm',
    display: 'password confirmation',
    rules: 'required|matches[password]'
}, {
    name: 'email',
    rules: 'valid_email'
}, {
    name: 'minlength',
    display: 'min length',
    rules: 'min_length[8]'
}], function(errors, event) {
    if (errors.length > 0) {
        // Show the errors
    }
});
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