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Validating input Widget Connector width 900 url https://www.youtube.com/watch?v=oIRXG6jb7JY&index=14&list=PLbPt6SI1Zhb8CnWh7Gvopto7D6LEwcB9A height 500
Validate input to your application to verify the content being provided. To recap the steps in the video:
Action Validation: Contact Number
Add an action to validate the data typed that users type in for new contacts:.
- Open the
Contactsstream,. - Go to the section Actions, and add a new action.
- Give For the action the following settings, set:
- Name:
Validate Contact - Display Name:
Validate Contact Go to the
sectionAction Validation
Type in the following expression,section.
:
Enter an expression to check that the phone numbers typed in contain only numbers or spaces.
Code Block do (
- Name:
...
if (!matches(_form.ContactNumber, "[0-9 ]+"),
...
error("Invalid phone number")
...
) )
...
Tip Raising an error in a validation expression - using the error() function will stop the action at that point.
...
This means the data in the form will not be saved
...
and any other tasks in the action
...
, such as running task plans
...
, will not go ahead.
- Go to the section Stream Item Action Rules.
- Add a Stream Item Action Rule.
- Add a Stream Action Item and set:
- Name:
Validate Contact
- Name:
- Add a Stream Action Item and set:
- Stream Item Action
- : Update
- Click Apply.
- Copy Values by Name: tick
- Save all your changes to the action
- Drag the action
- Add a Stream Item Action Rule.
- Go to the section Stream Item Action Rules.
- onto the Add button, and drag the Update button
- onto the
ContactManagerdashboard.
- onto the
...
Action
...
Validation: Contact
...
Name
Next weWe'll add some additional validation to check that the contacts names have been setentered:
- Open the configuration form for the Action
Validate Contact.
You can- either open the stream configuration form for
Contacts
- and find the list of actions
- or click on the
AddorUpdatebutton
- . From the button configuration form, follow the quick link to the action details.
- either open the stream configuration form for
- Add a condition to the Action Validation to check that the
FirstNameandFamilyNameare both set:Add following expression to the existing action validation, . - In the existing Action Validation statement, enter an expression to check that both names are provided:.
| Code Block |
|---|
if ( (isEmpty(_form.FirstName) || isEmpty(_form.FamilyName) ), |
...
error("Please complete both names for the contact") |
...
) |
Save your changes
...
Final Action Validation will and that completes the configuration. It is useful to see what is going on behind the scenes. Click on the Add button in the configuration. You can see that by dragging the action onto the button, you have set the action for the button to Validate Contact.
Go into App Mode. Type in a new contact and include an invalid character in the telephone number, for example, a letter. This should report an error. You can correct this, then save the new contact. Also test the contact name validation.
The final Action Validation should look like this:
| Code Block |
|---|
do( |
...
// Validate the Contact Number if (!matches(_form.ContactNumber, "[0-9 ]+"), |
...
error("Invalid phone number") |
...
), // Validate the Contact Names if ((isEmpty(_form.FirstName) || isEmpty(_form.FamilyName)), |
...
error("Please complete both names for the contact") |
...
) ) |
...
...
| Panel |
|---|
Next video: 13. Data Types and Formatting |