Juquery Validation Plugin validation Addmethod method use notes

The method has three API interface parameters, Name,method,messages

Addmethod (Name,method,message) method

The parameter name is the name of the method added.

The parameter method is a function that receives three parameters (Value,element,param).
Value is the value of an element, which is the element itself, and param is a parameter.

We can use Addmethod to add validation methods other than the built-in Validation method. For example, there is a field, can only lose one letter, the range is a-f, the wording is as follows:

$.Validator.Addmethod("AF",function(Value,Element,Params){ If(Value.Length>1){Return False;} If (value>=params[< Span class= "lit" >0] && Value<=params[1) { return true;}else{return  false;}}, "must be a letter and a-f"    

If there is a id= "username" for a form field, write in the rules:

Username: {   af: ["A","F"]}       

The first parameter of the Addmethod is the name of the added validation method, which is AF.

The second parameter of the Addmethod is a function, which is more important and determines how to use this validation method.

The third parameter of Addmethod is the custom error prompt, where the prompt is: "must be a letter and a-f".

If there is only one parameter, write directly, such as AF: "A", then A is the only parameter, if multiple parameters, then write in [], separated by commas.

Juquery Validation Plugin validation Addmethod method use notes