jquery_validator_custom_methods.js

jQuery.validator.addMethod("alphanumeric", function(value, element) {
      return this.optional(element) || /^[A-Za-z0-9 _]*[A-Za-z0-9][A-Za-z0-9 _]*$/.test(value);
 }); 
    
jQuery.validator.addMethod("letterwithspaces", function(value, element) {
     return this.optional(element) || /^[a-zA-Z\s]+$/.test(value);
}); 

jQuery.validator.addMethod("imagetype", function(value, element) {
      return this.optional(element) || /^.*\.(jpg|png|jpeg|gif)$/i.test(value);
}, "Please Select .jpg OR .png OR .gif Image");

jQuery.validator.addMethod("filetype", function(value, element) {
      return this.optional(element) || /^.*\.(doc|docx|pdf)$/i.test(value);
}, "Please Select .doc OR .docx OR .pdf Image");

jQuery.validator.addMethod('filesize', function(value, element, param) {
    // param = size (in bytes) 
    // element = element to validate (<input>)
    // value = value of the element (file name)
    return this.optional(element) || (element.files[0].size <= param) 
});

jQuery.validator.addMethod("lettersonly", function(value, element) {
    return this.optional(element) || /^[a-z ]+$/i.test(value);
}, "Please enter alphanumeric letters only"); 

jQuery.validator.addMethod("noSpace", function(value, element) { 
    return value.indexOf(" ") < 0 && value != ""; 
}, "Please enter valid account number");

jQuery.validator.addMethod(
    "regex",
        function(value, element, regexp) {
            var re = new RegExp(regexp);
            return this.optional(element) || re.test(value);
        },
        "Please enter valid format."
);