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Hi,
I have used Dynamic dropdown Example like example.
I have a dropdown list that get data from db. In read data(event auto) i get 2 fields to retrieve (id and name). Es. id=1, name= Milano.
The name is the value that i have in my dropdown.
Now i want to fill a text box selecting from db a value where id = myid (example. id = 1)
How can i do?
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Regards
Daniele

Hi Daniele,
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Usually the simplest way to do this is to use a second Read Data action in the form On Submit event using the submitted drop-down selection to identify the record to read.
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Bob

Ho Bob,
thanks but i have to populate the text box dinamically, without click on button (so i immage that i cannot use a "On Submit Event") . I image to pass the selected "id" [that i get from "Read data action" in event "auto", called from Dropdown component (AutoComplete event)] to an event that contain a "Read Data Action" that get the value from a table and populate the text box. Is it ok? If yes, how can i do it? How can i pass the selected "id" and In which event i have to insert "Read Data Action" to get the value to populate the textbox?
Thanks very much Bob
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regards

So just to check I have things right.
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You want to populate a dropdown with data from a database.
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When the user selects an option on the dropdown, you want to replace the data in a textbox with new data from the database matching the row.
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I spent an hour on this just for fun and learning so get ready. Change all the names of things to whatever you need for your form.
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You have a dropdown, let's call it "dropdown".
Under "events", you want On: change, Actions: reload, Identifier: text_field
I will assume you already correctly set up the read data actions in your load event to dynamically populate the dropdown.
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You have a text field, let's call it "text_field".
Under "advanced", you want Reload event: reload_text_field
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You have a database table called xx_my_data, with three fields: id, name, flavour.
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Under the "Setup" tab at the bottom of the page, create a new event called "reload_text_field".
You then want a Read Data action, with your table selected, and call the model "model".
* Where conditions: model.id:{data:dropdown}
* Fields to retrieve: model.flavour
* Select type: first matching record
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Then you need a PHP action (under "Logic"). Replace "action_name" with the name of the read data action, the text in the black Name box. It should probably be "read_data5" or something along those lines.
$this->data("text_field", $this->get("action_name.model.flavour", ""), true);
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Lastly, you need a Custom code action, with:
{view:text_field_view_name} where text_field_view_name is the Name: in the black label of the field.
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*drops mic*

thanks for your clear explanation but it does not work, in the sense that when I select a dropdown value, my textbox disappears.Anyway, I have a doubt about that said:
I have a dropdown (name:comune) and a text box (name:provincia)
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In Dropdown, Under Advanced, i have autoComplete event called: "auto" and under Events i have On: change, Actions: reload, Identifier: provincia (text box's name)
Under the "Setup" tab at the bottom of the page, i have event called "auto".
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1)i have a Read Data action (name:read_data4), with my table selected, and the model is "Data".
* Where conditions: Data.nomeComune/LIKE:{data:comune}%
* Fields to retrieve:
Data.idProvincia
Data.nomeComune
* Select type: Return an array of key/value pairs, two field must be provided.
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2) Then a have a custom code with:{var/jsonen:read_data4}
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I followed your procedure but maybe the problem is here.
When you say:Thanks very much.
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Regards
Daniele

So you have an event called auto, which is what populates your dropdown. And you also have a SECOND event, called reload_text_field right?
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And you should put nothing in place of data:dropdown, data:dropdown refers to the VALUE that gets sent and not the label, and you have it set up correctly in that regard

Hi,
yes, i have 2 events, the first to populate the dropdown, and the secondo to populate the text box.
How does the event understand that in the "WHERE conditions" it should use the idProvincia ?
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Consider that the key / value pairs (Data.idProvincia / Data.nomeComune) is recovered in the dropdown.
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Regards
Daniele

{data:dropdown} gets the key.
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Just take a backup of your form and upload it here using the file upload button.

Ok, thank you![file=10364]test_dynamic_04_Apr_2018_09_37_08.cf6bak[/file]
i have updated my form.
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thank you so much!
Regards

In the custom code, you should have {view:name_of_the_view} not {view:name_of_the_field}. The name_of_the_view is the black label, so it's probably field_text3

Sorry..but which view? I'm sorry for the stupid question:(

Under Setup->reload_text_field->Custom Code, where you currently have {view:provincia}
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Instead of that you need to use the label in the black for the field. Like in the screenshot here. So it should be {view:field_text3}

Uauh, great!! Thank you so much! i hope that this code can help other people.
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Thanks
Regards
Daniele