Azure ARM Template for Dropdownn type Parameter

Question

I am creating a Azure ARM template to provision VMs based on the environmnet type; so created an array type parameter as below,

  "EnvironmentType": {
"type": "array",
        "defaultValue": [
            "Dev",
            "Test",
            "PreProd",
            "Prod"
        ]

},

But on Azure portal this parameter is rendered as textbox with comma separated values as shown in below screenshot.

How to get this parameter displayed as dropdown?

Answer 1

How to get this parameter displayed as dropdown?

As bmoore-msft mentioned we could replace the defaultValue with allowedValues and array with string. We also could set the dropdownlist default value from the template. In your case, please have a try to use the following code. More details we could refer to the Customize the template.

"parameters": {
  "EnvironmentType": {
    "type": "string",
    "allowedValues": [
        "Dev",
        "Test",
        "PreProd",
        "Prod"
    ],
    "defaultValue": "Dev",
    "metadata": {
      "description": "The type of replication to use for the EnvironmentType."
    }
  }

Answer 2

Replace "defaultValue" with "allowedValues" and "array" with "string".