jQuery cancels valid verification

When writing a form, it is obviously necessary to verify the data entered by the user. jQuery provides us with a very convenient plug-in jQuery Validate, which can help us easily implement form validation. But sometimes we also need to cancel the verification of certain fields. What should we do in this case? Let's introduce how to use jQuery to cancel form validation.

1. Cancel validation of a single field

Suppose we now have a form that contains two fields: name and phone number. If we want to cancel the verification of the phone field, we can use the following code:

$("form").validate({
  rules: {
    name: {
      required: true,
      minlength: 2
    },
    phone: {
      required: true,
      minlength: 11
    }
  },
  messages: {
    name: {
      required: "请输入您的姓名",
      minlength: "姓名长度不能少于2个字符"
    },
    phone: {
      required: "请输入您的电话",
      minlength: "电话长度不能少于11个字符"
    }
  }
});

$("input[name='phone']").rules("remove", "required minlength");

In the code, we first set up the form verification through the validate method, which includes the rules and sum of the name and phone fields. Prompt information. Then, select the input box of the phone field through the jQuery selector, and use the rules method to remove "required" and "minlength" from its validation rules. In this way, the phone field no longer needs to be verified.

2. Cancel the verification of the entire form

Sometimes, we may also need to cancel the verification of the entire form, such as performing form verification before submitting the form, but In some special cases, we need to submit the form directly without verification. At this time, we can use the following code:

$("form").validate({
  rules: {
    name: {
      required: true,
      minlength: 2
    },
    phone: {
      required: true,
      minlength: 11
    }
  },
  messages: {
    name: {
      required: "请输入您的姓名",
      minlength: "姓名长度不能少于2个字符"
    },
    phone: {
      required: "请输入您的电话",
      minlength: "电话长度不能少于11个字符"
    }
  }
});

$("form").submit(function(){
  $(this).validate().cancelSubmit = true;
  if($(this).valid()){
    // 表单校验通过，进行表单提交
  }
});

In the code, we also first use the validate method to set up the form verification. In the form submission event, we obtain the form validation object by calling the validate() method, and set its cancelSubmit attribute to true, which means canceling the automatic submission behavior of the form. Then, we perform another form verification, and if it passes, perform the form submission operation. If form validation fails, the form will not be automatically submitted.

Summary

Through the above introduction, we learned how to use jQuery Validate to cancel the verification of a single field and the verification of the entire form. This will be very useful in actual development and can improve the flexibility and scalability of form validation. Of course, in practical applications, we need to decide whether to cancel the verification of certain fields or the entire form based on specific business needs.

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