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Populate wtforms select field using value selected from previous field

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. New to this, trying to build an app following a well known Flask tutorial, using Flask-bootstrap, Flask-wtforms, Jinja etc.

I want only the first field to be pre-populated, and the other to get populated on the client side? So, I guess my question really is: how do I implement an onChange event on this wtf form field? And is this what I have to do, or is there a way from the view function? Here is an example implementation of this logic to work with WTForms native functionality.

The trick here, is if you want to use WTForms validation, you need to instantiate the form with every possible value, then modify the available options in Javascript to show the filtered values based on the other select. For this example I'm going to use the concept of States and Counties I work with a lot of geo data so this is a common implementation I build.

Here's my form, I've assigned unique IDs to the important elements to access them from Javascript:. And, finally, the Javascript to place at the bottom of your Jinja template. I'm assuming because you mentioned Bootstrap, that you are using jQuery. I'm also assuming this is in line javascript so I'm using Jinja to return the correct URL for the endpoint. PJ Santoro's answer is great.

The update on load was called but the event listener didn't work for me at first. Turned out that I hadn't swapped out 'state' for my own field ID as I thought it was a keyword referring to the state of the field! So in looking for other options, I found this also worked, that might be useful for somebody out there:. Only thing to add, which would have saved me hours of screaming at the screen, is that the current Bootstrap code snippets from their website use a slim version of JQuery.

The slim version doesn't contain some of the functions that abigperson uses in their code. A little further reading suggests that Bootstrap will still function just fine with the full version of jQuery so game on. Learn more. Asked 3 years, 3 months ago. Active 5 months ago.Fields are responsible for rendering and data conversion. They delegate to validators for data validation. When a field is defined on a form, the construction parameters are saved until the form is instantiated.

At form instantiation time, a copy of the field is made with all the parameters specified in the definition. Each instance of the field keeps its own field data and errors list. The label and validators can be passed to the constructor as sequential arguments, while all other arguments should be passed as keyword arguments. Some fields such as SelectField can also take additional field-specific keyword arguments.

Consult the built-in fields reference for information on those. Field instances contain the data of that instance as well as the functionality to render it within your Form.

They also contain a number of properties which can be used within your templates to render the field and label.

JSON - Dynamic Dependent Dropdown List using Jquery and Ajax

Call its bind method with a form instance and a name to construct the field. To validate the field, call its validate method, providing a form and any extra validators needed. Validates the field and returns True or False. This is usually only called by Form. Override if you need to run any field-level validation tasks after normal validation. Only override this for special advanced processing, such as when a field encapsulates many inputs. This will be called during form construction with data supplied through the formdata argument.

Contains the resulting sanitized value of calling either of the process methods. Note that it is not HTML escaped when using in templates. If form data is processed, is the valuelist given from the formdata wrapper. This is the data passed from an object or from kwargs to the field, stored unmodified.

This can be used by templates, widgets, validators as needed for comparison, for example. To render a field, simply call it, providing any values the widget expects as keyword arguments. Usually the keyword arguments are used for extra HTML attributes.

This delegates rendering to meta. Note: Simply coercing the field to a string or unicode will render it as if it was called with no arguments. Returns a HTML representation of the field. To allow for printing a bare field without calling it, all WTForms fields implement this method as well. The HTML form name of this field.

populate wtforms select field using value selected from previous field

This is the name as defined in your Form prefixed with the prefix passed to the Form constructor. If unspecified, this is generated for you to be the same as the field name. A string containing the value of the description passed in the constructor to the field; this is not HTML escaped.

Errors obtained during input processing. These will be prepended to the list of errors at validation time. The type of this field, as a string. This can be used in your templates to do logic based on the type of field:. An object containing boolean flags set either by the field itself, or by validators on the field. For example, the built-in InputRequired validator sets the required flag.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. 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 have a SelectField that is populated from a database table. I load the choices into the form as follows:. Any assistance would be greatly appreciated! I am building my first Flask app so I'm new to this.

In my experience with flask, you can do this a couple of ways. There is no right way, and it is all up to you:. Then you can do an onchange with JavaScript, which can then get the data-detail value and update your text box this is pseudo code, not meant for copy and paste :.

You can do it where it pulls from the database dynamically if you don't wan to put the data-detail tag in your code, like this:. Same onchange with JavaScript, but can then do a call to an Ajax call to your routed method to return your value this is pseudo code, not meant for copy and paste :.

Learn more. Asked 5 years, 7 months ago.

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Active 4 years, 10 months ago. Viewed 6k times. I load the choices into the form as follows: statuses. Column db. If the user selects the "Apple" option, the default text should be "The apples are red. So you want to change the text area field based on the selected option from the drop down?

Also, you want to query this each time something is selected? Active Oldest Votes. Thanks, JasonHeine. I will implement your suggestions. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

Using WTForms for SelectField in Flask

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populate wtforms select field using value selected from previous field

I've noticed there's a better way to do this by injecting an object into the form references here and here. I've tried the following, however, it doesn't work. Where am I going wrong is the object supposed to be something other than a dictionary? Note these pre-populated values come from a database. Some values are defined while some aren't. I think you want to use the data parameter instead, as mentioned in this documentation:.

This is only used if formdata and obj are not present. It does work with the formdata parameter as well, but you will have to pass a MultiDict object:. That means you need to pass in an object with attribute names same as your forms' attribute name, as follows:. Learn more. WTForms: populate form with data if data exists Ask Question. Asked 3 years ago. Active 3 years ago. Viewed 2k times. Johnny Metz Johnny Metz 2, 3 3 gold badges 21 21 silver badges 64 64 bronze badges. Yeah, it needs to be a MultiDict.

This is what the flask request post data comes back as. It's intended to be used with post data in the flask request. How can I create a MultDict from data I retrieve from a database?

Active Oldest Votes. I think you want to use the data parameter instead, as mentioned in this documentation: The Form class class wtforms. Form Declarative Form base class.

populate wtforms select field using value selected from previous field

Iron Fist Iron Fist 9, 2 2 gold badges 14 14 silver badges 29 29 bronze badges. Awesome answer thank you. So what is the obj parameter used for? Super helpful! Artagel Artagel 1 1 silver badge 12 12 bronze badges. Is your db data a dictionary? That didn't seem to work either. I'm using mongodb so yes, the data is retrieved as a python dictionary.Keep in touch and stay productive with Teams and Officeeven when you're working remotely.

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The value are all in the table to use for the lookup, the dropdown works but how o i connect it to the other fields so they display the required information from the table? Above is the form, so i want description and unit price to be automatically entered after itemid is selected. Below is the table where the values are stored, the values can appear more than once in this table so it just need to find a distinct itemid.

Typically you wouldn't want to store data that can be looked up in another table. However pricing information that will fluctuate is an appropriate situation for storing the data in more than one table. I assume your combo box is based on a table that stores the itemid, description, and unit price. If this is the case and you want to grab the unit price to store in a sales detail table.

This makes assumptions about unknown table structures and control names. Regarding the "x" in Column x the columns are numbered beginning with 0. Did this solve your problem? Yes No. Sorry this didn't help. Please look at what i have done below. The Description is probably one of those fields that shouldn't be stored in more than one place.

If it's in the Items table, why do you need to store it anywhere else? Is it going to change over time and you need to store the description from some historical perspective? Regardless, you need to enter the code I suggested in VBA. Click the [ Thank you for your patience with someone who is new to Access.

I have done as suggested but i get an error which from google suggests i have mis-spelled something but i can't see what. Please see my blog article see below for address on Displaying Related data on a form.

It describes, in detail, techniques and reasons for doing this. As to the error message, it looks like your Controlname is itemid, not cboItemID.Okay my PowerApps gurus that I have learned so much from………I am having a issue that should be an easy thing, but me and my learning curve just is not getting where I am making my mistake.

What I need to do in the PowerApp is populate the text field of the Source depending on the selection of the Camera from a dropdown. I have set a varible and also set UpdateContext, but I am not getting the correct value in the textinput. Please help. Go to Solution. I was able to find a work around with filtered dropdowns. Thanks for the input! View solution in original post. I am struggling to populate the text value based on dropdown selection.

My sql table has three columns. ID, name and description. When user selects name from dropdown, i would like to default the text box to its corresponding description. Title, Description. If your Dropdown references your SQL datasource, it should already have the 3 fields in each record. Thus, you should just be able to reference the field name appended to the. Selected property of the DropDown:. That works for the dropdown value. I wanted to display my other field text field to default to correspoding column record based on dropdown value selection.

That said, the only thing I would wonder is Click for the top entries. Innovate, Collaborate, Grow - The top training and networking event across the globe for Microsoft Business Applications. Skip to main content.There are two ways you might want to populate a drop down field. The first way is pre-selecting a drop down option when the form is displayed via the Default Value setting.

The second way is dynamically populating the options that are available in a select aka drop down field. This walkthrough will teach you how to configure the latter. The premise for this walkthrough is that we want to populate the options in a Gravity Form select field with all of the posts currently published on the site.

This is really useful, especially when you are looking to display content that will be constantly changing. In our case, this saves us the time and hassle of having to update our drop down of posts every time we add a new post. You should update the 51 here to the ID of your form.

Using a CSS class to identify our desired field allows us to manage which field should be targeted right from the Gravity Forms admin. If the current field we are at in the loop is not a select OR does not have our designated CSS class, we simply skip that field and move on to the next.

For more information on how to modify which posts are returned, read here. Quick Tip: You can retrieve any kind of post type here; even custom post types. Each option consists of:.

In some cases you may want to collect the ID of the selected post.

Default value based on another field lookup - Access 2007

We do this by assigning the choice text to the fields placeholder property. This ensures that if this is a required field, that the user must select an option other than the placeholder option. Failing to do so will generate a validation error. When you view your form on the front end you should now see that your select field is populated with a list of all your current posts.

The form switcher is gone after updating to 2. Where's that old forum topic? This is not a Gravity Forms limitation but a consequence of using caching.

Last modified: March 11, Was this article helpful? Return to the Gravity Forms Main Site.


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