Card controls are the building blocks of the Edit form and Display form controls in canvas apps. The form represents the entire record, and each card represents a single field of that record.

You can interact with cards most easily in the right-hand pane after you select a form control in the design workspace. In that pane, you can choose which fields to show, how to show each field, and in what order to show them. This example shows an Edit form control in an app built from a list that's named Assets.

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In addition to containing controls, cards themselves are controls that have properties and formulas just like any other control. When you choose to display a field on a form, the right-hand pane automatically creates the card for you and generates the needed formulas. We can see these formulas in the Advanced tab of the right-hand pane:

We immediately see one of the most important properties of the card: the DataField property. This property indicates which field of the data source the user sees and can edit in this card.

On the Advanced tab, the banner at the top indicates that the properties of this card are locked. A lock icon also appears next to the DataField, DisplayName, and Required properties. The right-hand pane created these formulas, and the lock prevents accidental changes to these properties.

Let's modify the DisplayName to put a space between Asset and ID. By making this change, we're altering what was generated for us. In the right-hand pane, this card has a different label:

We've now taken control over this card and can modify it further to fit our need. But we've lost the ability to change the card from one representation to another (for example, single-line text to multi-line text) as we did before. We've transformed the predefined card into a "custom card" that we now control.

You can change the appearance and behavior of an unlocked card in a variety of ways, such as adding and deleting controls within it. For example, you can add a star shape from the Icons menu on the Insert tab.

We can do the same thing on the second screen of this app, where we use a Display form control to display the details of a record. In this case, we may want to hide the label (set the Visible property of the label, not the card, to false) because the user won't edit the URL on that screen:

Below are some guidelines for how controls should work with their card and how the cards should work with the form. These are only guidelines. As with any control in Power Apps, you can create formulas that reference any other control in Power Apps, and that's no less true for cards and controls within cards. Be creative: you can create an app in many ways.

The Default property of every card should be set to ThisItem.FieldName. Under certain circumstances, you might want to transform this value on the way in. For example, you might want to format a string or translate the value from one language to another.

Each control within the card should reference Parent.Default to get at the field's value. This strategy provides a level of encapsulation for the card so that the card's Default property can change without changing the internal formulas of the card.

By default, DefaultValue and Required properties are taken from the data source's metadata based on the DataField property. You can override these formulas with your own logic, integrating the data source's metadata by using the DataSourceInfo function.

After the user modifies a record by using controls in the cards, the SubmitForm function saves those changes to the data source. When that function runs, the form control reads the values of each card's DataField property to know what field to change.

The form control also reads the value of each card's Update property. This value will be stored in the data source for this field. This is the place to apply another transform, perhaps to reverse the transform that was applied in the card's Default formula.

The Valid property is driven from the metadata of the data source, based on the DataField property. It's also based on the Required property and whether the Update property contains a value. If the value on the Update property isn't valid, the Error property provides a user-friendly error message.

If the DataField property of a card is blank, the card is just a container of controls. Its Valid and Update properties don't participate when the form is submitted.

To populate these controls with data, their properties can be driven from the properties of the card, through these key formulas. Note that formulas refer to a specific field. Instead, all information comes from the card.

I do not understand why it is not allowed to put the editforn in view mode as it is designed and that when you put the form in view mode it shows the ugly diplayform that is imposible to pretify, even insert lines/icons/images into cards is impossible, and modifying fonts and colors and position is a time spent problem when you have to do it on 50 fileds cards.

I doubt if we can select controls from different cards, but to your requirement, you can change the font size of second control to first control, so that any change in first control will reflect in other controls where the font property is set (per first one).

I live in Mumbai and I have MTS ZTE AC 2787 data card. However, unable to use it since the MTS service has been discontinued in Mumbai. Please let me know how to unlock it to use it with other operator or the place in Mumbai where I can get it unlocked.

Thank you Pratul and aalok for replying. I have another MTS data card as well "AnyData ADU-555c" which I have tried to unlock with CDMA Workshop and I was able to unlock it. However, it does not have SIM card slot. If I can get the SIM card slot installed by any local vendor then is it possible to use it with other operators ? As i do not know much about flashing and updating firmware.

When you add a form to your canvas app, data cards get created for a few fields. You can select more fields for additional data cards. Among other things, A data card consists of a data card key which is the label describing what the data card is for and a data card value which has controls that can be used to display existing values or for users to use to specify values for the associated data cards.

The controls (data card value) are picked by default depending on the data type e.g. a text input control for a text field, combo-box for option set values, date picker control for date fields etc. As you can see from these examples, most controls picked by default are correct for their associated field types.

That being said, there are situations in which you would want to replace the default data card control with another one. For example, for a two-option field, a toggle would be better than a combo-box. I have outlined the steps you would want to follow if you want to replace a default data card control.

The default property of the data card itself will still be ThisItem.EmployeeWith all these changes, here is a comparison of two versions of the same form - one that uses a combo box for a two-option field and one that uses a toggle.

The first thing everyone should know.. is how to select multiple data cards.

Why? Because unless you are using my branding template (or similar template), setting the bordercolor property for each individually takes time and many of the interior controls on a form use Parent.Bordercolor to define their own bordercolor, which is then used to define the hover and pressed bordercolor properties.

Select a single data card, then hold shift and select a second data card.

This will now look like only the second card is selected.

If you hold shift and click other cards now (including the first), you will be able to select multiple cards and change their properties simultaneously (in this case we have done Fill, although I would usually set the bordercolor)

Next up we have selecting multiple items within Multiple datacards!

Same as above, unless you are using my template or have created your own based off of that concept, then you will need to edit the item properties of each control within a form individually. This is time-consuming and there is a better way to do it if you must do it manually.

This method should ideally be done AT THE START of building your form, because the method involved resets many properties (specifically coordinate and size properties are of concern) of the datacards, which we will overwrite later. 0852c4b9a8

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