mixin : convert object / array to formData

convert-object-array-to-formdata.js

export default {
    methods: {
        objectToFormData(obj, form, namespace) {
    
            var fd = form || new FormData();
            var formKey
            
            for(var property in obj) {
                if(obj.hasOwnProperty(property)) {
                
                    if(namespace) {
                        formKey = namespace + '[' + property + ']';
                    } else {
                        formKey = property;
                    }
                    
                    // if the property is an object, but not a File,
                    // use recursivity.
                    if(typeof obj[property] === 'object' && !(obj[property] instanceof File)) {
                        
                        this.objectToFormData(obj[property], fd, property);
                        
                    } else {

                        // if it's a string or a File object
                        fd.append(formKey, obj[property]);
                        
                    }
                
                }
            }
            
            return fd;
            
        }
    }
}