Create Features with attributes from form elements that can be empty
I have a workflow that creates point features with attributes from a form. Within the Create Feature activity, I define the attributes by defining a dictionary of name-value pairs, like
={'OBJECTNUMBER': $form1.state.number1.value.numeric, 'NAME': $form1.state.textBox1.value, 'TYPE': $form1.state.dropDownListTYPE.value}If the user hasn't set a value into all the form elements, the workflow fails stating: "The given expression could not be evaluated".
What is the best way to come around this? I have thought that one way to do it would be to start by creating an empty dictionary, and then go through all the elements in the form adding a name-value pair for the elements that have a value set (e.g. if !!$form1.state.number1.value). Would this work, or is there a better way to do this?
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Hi Jostein,
I think there's a few options that you could try:
- Set all of the inputs in the form to be Required.
- After the form is submitted, check that values were entered using If statements and potentially assign default values.
Your idea should work using the Add Item activity to an empty collection.
Thanks, Stefan
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Go to any popular site with a registration form, and you will notice that they give you feedback when you don't enter your data in the format they are expecting. You'll get messages such as:
"This field is required" (you can't leave this field blank)
"Please enter your phone number in the format xxx-xxxx" (it enforces three numbers followed by a dash, followed by four numbers)
"Please enter a valid e-mail address"
"Your password needs to be between 8 and 30 characters long, and contain one uppercase letter, one symbol, and a number"
This is called form validation — when you enter data, the web application checks it to see that the data is correct. If correct, the application allows the data to be submitted to the server and (usually) saved in a database; if not, it gives you an error message explaining what corrections need to be made. Form validation can be implemented in a number of different ways.
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Thanks for your answer, Kevin. This post was not about form validation, but about the best way to apply logic in the workflow allowing the possibillity to submit a form containing fields with no value set.
I solved this by creating an empty dictionary with Create Value. Then, I run a check like e.g. if !!$form1.state.number1.value on each form element. If the form element has a content, use Evaluate Expression to add the attribute name and the value as a key-value pair to the dictionary that is used as input to CreateFeature.
With more than 30 attributes in the destination feature class, it was a lot of work setting up all the IF-tests and expression evaluations. If someone has a better way to do this, please let me know
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