Django form initial value

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django form initial value

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to know how to set the default value for that tank hidden field. You can use initial which is explained here. I had this other solution I'm posting it in case someone else breviarium romanum pdf me is using the following method from the model :.

Learn more. Django set default form values Ask Question. Asked 11 years, 1 month ago. Active 1 month ago. Viewed k times. I have a Model as follows: class TankJournal models.

POST if form. Mike Mike 6, 7 7 gold badges 48 48 silver badges 71 71 bronze badges. Active Oldest Votes. Jeremy Z 7 7 silver badges 12 12 bronze badges. Sergey Golovchenko Sergey Golovchenko And how is that variable initial passed to the actual form?

How to have default/initial values in a Django form that is bound and rendered

The initial value does not apply if the form has been bound:. Works great! Phlip: Don't override View. Other solution: Set initial after creating the form: form.

Andreas Zwerger Andreas Zwerger 4 4 silver badges 5 5 bronze badges. This work for my need, only init one field in the form. That or None part is really not needed. I had this other solution I'm posting it in case someone else as me is using the following method from the model : class onlyUserIsActiveField forms.

Izuzvo Izuzvo 4 4 silver badges 13 13 bronze badges. I hope this can help you: form. Valerii Boldakov 1, 5 5 silver badges 13 13 bronze badges.Posted by: admin November 29, Leave a comment. I am on django 1. Could anyone give me a definitive answer if it is possible? If you have already called super.

If you study form. Having a value of None in that dict will override the field. Note: the initial values has to be a list and the choices has to be 2-tuples, in my example above i have a list of 2-tuples. Hope this helps.

I ran into this problem as well, and figured out that the problem is in the browser. When you refresh the browser is re-populating the form with the same values as before, ignoring the checked field. That will re-load the form from scratch. Dave — any luck finding a solution to the browser problem? Is there a way to force a refresh?

Tags: djangoformsselect. December 31, Django Leave a comment. Questions: I have models with many to many relationships like this: class Contact models.

TextField class Mail models. Questions: I am writing a Django application that has a model for People, and I have hit a snag.

Setting the selected value on a Django forms.ChoiceField

Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Add menu. Setting the selected value on a Django forms. ChoiceField Posted by: admin November 29, Leave a comment. You can also do the following. Try this it works for me, I have added this in models. Logical or of Django many to many queries returns duplicate results December 31, Django Leave a comment Questions: I have models with many to many relationships like this: class Contact models.

Django model field choices — wouldn't a dict be better? Django: Order a model by a many-to-many field December 31, Django Leave a comment Questions: I am writing a Django application that has a model for People, and I have hit a snag. Leave a Reply Cancel reply Your email address will not be published.In this tutorial, we'll show you how to work with HTML Forms in Django, and, in particular, the easiest way to write forms to create, update, and delete model instances. As part of this demonstration, we'll extend the LocalLibrary website so that librarians can renew books, and create, update, and delete authors using our own forms rather than using the admin application.

Forms are a flexible mechanism for collecting user input because there are suitable widgets for entering many different types of data, including text boxes, checkboxes, radio buttons, date pickers and so on. Forms are also a relatively secure way of sharing data with the server, as they allow us to send data in POST requests with cross-site request forgery protection. While we haven't created any forms in this tutorial so far, we've already encountered them in the Django Admin site — for example, the screenshot below shows a form for editing one of our Book models, comprised of a number of selection lists and text editors.

Working with forms can be complicated! Developers need to write HTML for the form, validate and properly sanitize entered data on the server and possibly also in the browserrepost the form with error messages to inform users of any invalid fields, handle the data when it has successfully been submitted, and finally respond to the user in some way to indicate success.

Django Forms take a lot of the work out of all these steps, by providing a framework that lets you define forms and their fields programmatically, and then use these objects to both generate the form HTML code and handle much of the validation and user interaction. In this tutorial, we're going to show you a few of the ways you can create and work with forms, and in particular, how the generic editing views can significantly reduce the amount of work you need to do to create forms to manipulate your models.

Along the way, we'll extend our LocalLibrary application by adding a form to allow librarians to renew library books, and we'll create pages to create, edit and delete books and authors reproducing a basic version of the form shown above for editing books. Consider a simple HTML form, with a single text field for entering the name of some "team", and its associated label:.

While here we just have one text field for entering the team name, a form may have any number of other input elements and their associated labels. The field's type attribute defines what sort of widget will be displayed. The matching team label is specified using the label tag see "Enter name" abovewith a for field containing the id value of the associated input.

The form attributes define the HTTP method used to send the data and the destination of the data on the server action :. The role of the server is first to render the initial form state — either containing blank fields or pre-populated with initial values.

After the user presses the submit button, the server will receive the form data with values from the web browser and must validate the information.

Once the server gets a request with all valid form data, it can perform an appropriate action e. As you can imagine, creating the HTML, validating the returned data, re-displaying the entered data with error reports if needed, and performing the desired operation on valid data can all take quite a lot of effort to "get right". Django makes this a lot easier, by taking away some of the heavy lifting and repetitive code! Django's form handling uses all of the same techniques that we learned about in previous tutorials for displaying information about our models : the view gets a request, performs any actions required including reading data from the models, then generates and returns an HTML page from a template, into which we pass a context containing the data to be displayed.

What makes things more complicated is that the server also needs to be able to process data provided by the user, and redisplay the page if there are any errors.

A process flowchart of how Django handles form requests is shown below, starting with a request for a page containing a form shown in green. Django provides a number of tools and approaches to help you with the tasks detailed above.

django form initial value

In the next section, we describe how forms work using the practical example of a page to allow librarians to renew books. Note: Understanding how Form is used will help you when we discuss Django's more "high level" form framework classes. Next, we're going to add a page to allow librarians to renew borrowed books. To do this we'll create a form that allows users to enter a date value.

We'll seed the field with an initial value 3 weeks from the current date the normal borrowing periodand add some validation to ensure that the librarian can't enter a date in the past or a date too far in the future.

When a valid date has been entered, we'll write it to the current record's BookInstance. The example will use a function-based view and a Form class.

django form initial value

The following sections explain how forms work, and the changes you need to make to our ongoing LocalLibrary project. The Form class is the heart of Django's form handling system. It specifies the fields in the form, their layout, display widgets, labels, initial values, valid values, and once validated the error messages associated with invalid fields. The class also provides methods for rendering itself in templates using predefined formats tables, lists, etc. The declaration syntax for a Form is very similar to that for declaring a Modeland shares the same field types and some similar parameters.

Form data is stored in an application's forms. A very basic form class for our library book renewal form is shown below — add this to your new file:.Opened 4 years ago. Closed 4 years ago. Last modified 3 years ago. Download all attachments as:. I'd like to hear more about the use case. It might be argued that defaults should only apply to the population of initial forms and that if a user removes that value and submits a blank form, Django shouldn't transform it back to the default.

Of course if we decide on that resolution, we'll have to document the change. If we decide to keep the old behavior, I'm attaching a regression test. I still think we should fix the regression.

Do you feel the behavior should be restored for that case as well? Quoting and agreeing with you: if a user removes that value and submits a blank form, Django shouldn't transform it back to the default. In such a case, it's inappropriate to fallback to the model field's default if it's True. The current patch special cases this with isinstance form[f.

I see. So maybe another approach could be documenting that default values are used to populate initial blank forms, but not to fill missing data from the form input. In 4bc6b93 :. Fixed -- Fixed empty data fallback to model field default in model forms. In dd0b :. Backport of 4bc6baedef63a96 from master. The issue was that when a field on a prefixed form had a default, its unprefixed name wasn't found in form. Fixed with form. In d9ccf :.

Refs -- Fixed regression with field defaults in prefixed forms. In db3eabf :. Backport of d9ccfeeded14c6cec9e81c4 from master. I am noticing an odd behavior upgrading a Django app and I have traced it to this ticket.

I have upgraded the app from 1. I have determined the reason why to be its a ModelForm and the model has a field defined with a default value:.

It would appear that in 1. I think this behavior is incorrect, shouldn't it prefer the form's cleaned data over the model defaults? The behavior you describe isn't what's implemented. Hopefully it's not documented anywhere. It should be possible to adapt your code. For example, this might work:. If you think we could improve the behavior and have a patch to propose, feel free to open a new ticket.After creating a Django Form, if one requires some or all fields of the form be filled with some initial data, one can use functionality of Django forms to do so.

It is not the same as a placeholder, but this data will be passed into the view when submitted. There are multiple methods to do this, most common being to pass the data dictionary when we initialize the form in Django view.

Illustration of passing initial data using an Example. Consider a project named geeksforgeeks having an app named geeks.

Now to render this form we need to create the view and template which will be used to display the form to user. This first and most commonly used method to add initial data through a dictionary is in view. Here is the code of views. This method is senior of all and will override any data provided during other methods. One can add initial data using fields in forms. An attribute initial is there for this purpose. In forms. One can see the data being updated to method 2. This way one can add initial data to a form in order to ease the work by a user or any related purpose.

This data will be passed to models or views as defined by user and would act as normal data entered by user in the form. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Writing code in comment? Please use ide. How to pass initial data to a Django form?Opened 4 years ago. Closed 4 years ago. Last modified 3 years ago.

This is something I need to do. Or if I provided a PR, would that be welcome? The closest ticket I can find related to this is This is kind of how I'm working around it for now What implementation do you have in mind? How would it look like in combination with ? I'm not sure if we need both methods. By the way, it's helpful to describe your use case in a bit more detail than "This is something I need to do.

As for your question about how it would look in combination withwell, there's nothing there, so there's no conflict or integration. That is an open ticket that is 8 years old with a small patch that wasn't integrated. The patch does not actually do any kwargs injection, which is what I need, and is the existing pattern. What I mean is that if we add a hook for form initialization, couldn't that include specifying some custom kwargs? It might be overengineering to add two hooks -- ModelAdmin is already very complex with a large number of hooks.

Can you make customizations in Form. Yes, I can make customizations there, at least, some of them; e. I'll have a think this afternoon.

Initial form data – Django Forms

In django. One discrepancy is that ModelForm. Perhaps a more fruitful effort would be to try converting the admin to class-based views as described in I agree that the admin should be completely refactored to be view-based, but that could be years of effort. Hey Thomas - I had a very similar situation I ended up using django's curry for clean solution:. Django is a registered trademark of the Django Software Foundation.

Django The web framework for perfectionists with deadlines. Opened 4 years ago Closed 4 years ago Last modified 3 years ago. Oldest first Newest first Threaded. Show comments Show property changes. Hi Tim, sorry for not being specific enough. POST, request. POST, 'files': self. POST, 'files': request. Last edited 4 years ago by Thomas Hauk previous diff. Hi Tim -- I think this might be a case of "the perfect is the enemy of the good" here.

Hey Thomas - I had a very similar situation I ended up using django's curry for clean solution: from django. Note: See TracTickets for help on using tickets. Thomas Hauk.Django's Form framework is excellent.

It's intuitive and versatile and, best of all, easy to use. The whole initial trick is something you can set on the whole form or individual fields. But it's only used in UN-bound forms when rendered. Now, the form is bound and the initial stuff is essentially ignored.

Because name is not present in request. And if it was present, but an empty string, it wouldn't be able to benefit for the default value.

Now, suppose you don't have? GET the line print form. And, as expected, if you have? Follow peterbe on Twitter. Hey Peter, the behavior you implemented looks more like default than initial. You want to 1. Suggest a value for the user and 2. Select a value if the user did not provide it. Using an idiomatic merge would outline this behaviour. That's neat! For a full solution, you need to query the value of each field.

You can do this with. So you can instantiate a dummy form, and then go through the bound fields, calling.

Try DJANGO Tutorial - 27 - Form Validation Methods

It's not exactly elegant, though, forms in Django are a bit rough around the edges. Check out my side project Song Search. Home Archive About Contact. If you do this in Django: class MyForm forms. Haki Benita 12 January Reply Hey Peter, the behavior you implemented looks more like default than initial.

You're right.

django form initial value