Form verification of landline

landlineValidatorFn (value) {
     //  Verify the landline number   The longest 15 position , Allow input of "-"
            let validText = new Text().verify(value);
            if (validText) {
    
                return validText;
            }
            if (value.length >= 15) {
    
                return _(' The maximum allowable landline number 15 position ');
            }
            if (value.includes(' ')) {
    
                return _(' No blank space is allowed for landline ');
            }

            if (value.length === 1) {
    
                let tmp = value;
                if (isNaN(parseInt(tmp, 10))) {
    
                    if (!(value === '-')) {
    
                        return _(' Please enter a number or -');
                    }
                     
                }
            } else {
    
               let arr = value.split('');
               let res =  arr.every(function (item) {
      //every  One false is false 
                        if (isNaN(parseInt(item, 10))) {
    
                            if (item === '-') {
    
                                return true;
                            } 
                                return false;        
                        }  
                        return true;  
                });
                if (!res) {
    
                     return _(' Please enter a number or -');
                }
           }
            return true;
        },