I have a question, i explain, i have a form with two modelchoicefield and i want to fill the second modelchoice when the first is changed, both depend on from two tables joined with a foreign key relation then when i choice a value in the first modelchoice the second should load their values.
Please anyone knows the best way to do this?
Simple method would be to make selecting the first choice a post event. This would post the form at that stage back to the server, then your view code can render a new form with the second choice options based on whatever logic you need it to.
For a better UX you could run some AJAX on the page that will request the choices for the second field when the first has been selected.
Related
I want to achieve Dynamic form selection using Django
Vehicle_Type_Choices = (
(‘car’,’Car’),
(‘bike’,’Bike’),
(‘auto’,’Auto’),
)
vehicle_type = models.CharField(max_length=10,choices=Vehicle_Type_Choices)
Now I have 3 different forms (I.e CarForm, BikeForm, AutoForm) for Vehicle specifications based on the type of vehicle selected.
Now, I want if the user selects the Choice Car above, I want to display the CarForm (or) if the user selects Bike, then BikeForm has to be displayed for further filling of Data.
Please Help me to achieve the above scenario .
Thanks and regards
One of the most simple ways would be to just go to another page after a selection has been made (i.e. wizard type), anything else would need lots of javascript.
There is one package that can do form splitting, but never use it and not sure if/how can help in your situation, but I guess its worth taking a look: django-formtools
I'm trying to find the best way to go about my problem and I would love your input. I am trying to allow users to scan multiple barcodes into a text area. After they are submitted they are split into an array. The user then inputs how many iterations of each value in the array are to be inserted into a MySQL database. I've achieved this using PHP and session variables, looping through the array one step at a time. With Django I've found it a little more difficult and I am wondering if I should just have a "temporary" table in my database that gets refilled with the values from the array of barcodes. The following pages then pull each value from the table instead of using any sort of session variables.
Edit:
I apologize for the confusing question. Let me try and clear it up a bit:
I need to render a view based on each value in the user-submitted array. When it is first submitted, a view is rendered for the first value. When the user hits "Next" a view will be rendered for the second value in the array, and so on.
As for the database issue, each value can have two "types." The user will declare how many of each type is added to the database in each of the views I am trying to render.
Thank you.
this is nothing about django.
forget that temporary table.
add a field "filled" to ur table
select 1st not-filled row, and show "refill" page by this row
then update user input number back to db, set "filled" to "true" at same time.
You probably can port your PHP solution using a Django session object.
I'm not sure if that "one item at a time" is a feature or a "it was easier to code that way" thing, but in the second case - you may want to use Django Formsets to display all items at once and avoid looping through the array.
I'm currently implementing a solution using django admin, it allows users to define in the db a product, and then custom attributes and details, more details may be aggregated by a common attribute, this allows me to query with ajax a custom view that returns some JSON data to build automagically the form fields that I need directly in the same formset view (manipulating the DOM).
The current DB design follows this schema:
Catalog(name, description, photo)
Product(rel_catalog, name, base_price, photo, manufacturer_email)
ProductDetail(rel_product, rel_attribute, percentage_price, fixed_price)
ProductAttribute(rel_product, name, description)
As you may see I have a catalog, where there can be more products, a lot of details per product, aggregated by attributes. Then I simple show by default the Catalog, then the select with all available products for that catalog, then, choosing the right Product, I obtain the complete form (each row has a label with ProductAttribute.name and a select with related ProductDetail).
All works pretty dam good, but I also need to store this references in the DB when someone completes the form (making an order with choosen products). This forms are displayed as StackedInline (the ModelAdmin is for the Order).
I don't know how many options there may be per product so I was thinking to use this design to track orders:
Order(customer, status, notes, tot_price, inserted_by)
OrderItem(rel_order, catalog, product, unit_price)
But I don't know how to store the dynamic added inputs...
I was thiking to implement OrderItemProperty(rel_orderitem, rel_productdetail, rel_productattribute) to store each single input... but how do I loop over this unknown fields?
Maybe do you suggest a better design?
If you need more code just ask for it and I'll reply with a pastebin link.
Thankyou.
Finally I got a working solution,
I've created a custom view, overriding the default "add/" view, this way I can customize whatever I want to and I can read the POST data handling each validation, putting then the data in the right model.
I want to be able to create as many records as a user wants for a database table in a single form.
For example, there will be some inputs for the data required for a record and at the end of the line a "+" button that would make a new line of inputs appear. There should be no limit to the number of lines and when the user clicks on the single submit button, all of the records would be inserted.
Thing is : I don't know how to make a new line appear dynamically, I suppose I have to use jquery for that but I'm kind of a newbie :)
And I don't know how I can iterate through all the lines dynamically added.
If someone can point to an example or something, it'd save me a lot of hair pulling !
EDIT :
By following this blog post I managed to do that. I have one last problem which is : when I try to insert several records at one time, it keeps the last one fine, but the previous ones are considered empty. It tells me that the fields are required, I fill them up and click on save and only then it saves them allright.
Maybe I'll ask a new question for this!
Start here: https://docs.djangoproject.com/en/1.3/topics/forms/modelforms/#model-formsets
I suppose I have to use jquery for that
That can also work.
And I don't know how I can iterate through all the lines dynamically added.
You'll get all the fields of the form (all of them) in your request.POST object. If you use a formset, it will largely be handled by the form's clean() and save() methods.
I'm trying to make a Django order system that requires 2 forms. The first form, lets users choose some some quantities and basic contact info some. Then, using the quantities of each item they ordered I generate a 2nd form which allows them to choose some options for each item. This system is specifically for event tickets. Here are the 2 stages:
1) Get the order info such as name, address, phone of the person placing the order. Also find out how many people are coming to each of the possible events.
2) Based on the number of people per event, get their name and e-mail address.
I already have both forms created. I am just getting tripped up in the views. When they submit form 1, I need to take that info and save some of it and then send them to form 2. At form 2, they will fill out the rest of the info and finish processing.
How would you set up the views in such as case? I essentially nee-d to call on view form another and pass data between. I tried using kwargs, but I have trouble processing the second form.
Without seeing your models, it's hard to give an exact solution, but one approach is to have two separate views, one for each form.
Once you've processed the first form, you're most likely going to have an instance of some object that you created from the first form. It sounds like you just need to pass the id of that object to your next view where you could then get that object and do whatever association you need.
Also, it sounds like you might need to be collecting data from several instances of a form...
(2) Based on the number of people per event, get their name and e-mail
address.)
You'll want to use a formset for that.