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Arcade Label Expression Value Substitutions

ZacharyHart

I have a numerical attribute field containing integer values and would like to have the label expression display a corresponding value for each integer. I have created a dictionary representing these values.

However, the label expression dialogue indicates an error in line 2: Invalid Key. I cannot see anything wrong with the format of the dictionary based on other examples found within the forums.

The Arcade expression is shown below.

var stuff = {
  0: "SCC",
  101: "SEP",
  4: "CLT",
  23: "CGS",
  8: "CTR",
  7: "CTH",
  14: "DSW",
  9: "ECT",
  5: "FTH",
  21: "GPS",
  10: "GSL",
  3: "ITH",
  22: "ITS",
  13: "ISH",
  20: "OSR",
  17: "PTC",
  26: "PCT",
  24: "SAL",
  18: "STC",
  15: "SWR",
  19: "STR",
  6: "TFA",
  12: "3SS",
  11: "2SS",
  100: "GPE",
  25: "WHI",
  102: "RET",
  103: "TSI",
  104: "POL"
};

var keyField = "Type"; //this is the attribute field with the integer values
var lookupKey = $feature[keyField];
var lookupResult = Dictionary(stuff)[lookupKey];

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Accepted answers

ElisabethFenn

Not sure why an arcade expression would work in AGO and not in Pro, but I've come up with a different way to write this that is working in Pro:

var stuff = {
  "0": "SCC",
  "101": "SEP",
  "4": "CLT",
  "23": "CGS",
  "8": "CTR",
  "7": "CTH",
  "14": "DSW",
  "9": "ECT",
  "5": "FTH",
  "21": "GPS",
  "10": "GSL",
  "3": "ITH",
  "22": "ITS",
  "13": "ISH",
  "20": "OSR",
  "17": "PTC",
  "26": "PCT",
  "24": "SAL",
  "18": "STC",
  "15": "SWR",
  "19": "STR",
  "6": "TFA",
  "12": "3SS",
  "11": "2SS",
  "100": "GPE",
  "25": "WHI",
  "102": "RET",
  "103": "TSI",
  "104": "POL"
};

return stuff[Text($feature.Type)]

kenbuja

A key in the dictionary must be a string, not a number. You'll have to convert your field value to a string, in addition. Here's an example that works.

var stuff = {
  "0": "SCC",
  "101": "SEP",
  "4": "CLT",
  "23": "CGS"
};

var test = Text(0);
var lookupResult = Dictionary(stuff)[test]

All comments

ZacharyHart

Thanks for this Elisabeth!

I'm curious about the disparity between AGO in Pro in the implementation of Arcade regarding dictionaries now.

ElisabethFenn

Not sure why an arcade expression would work in AGO and not in Pro, but I've come up with a different way to write this that is working in Pro:

var stuff = {
  "0": "SCC",
  "101": "SEP",
  "4": "CLT",
  "23": "CGS",
  "8": "CTR",
  "7": "CTH",
  "14": "DSW",
  "9": "ECT",
  "5": "FTH",
  "21": "GPS",
  "10": "GSL",
  "3": "ITH",
  "22": "ITS",
  "13": "ISH",
  "20": "OSR",
  "17": "PTC",
  "26": "PCT",
  "24": "SAL",
  "18": "STC",
  "15": "SWR",
  "19": "STR",
  "6": "TFA",
  "12": "3SS",
  "11": "2SS",
  "100": "GPE",
  "25": "WHI",
  "102": "RET",
  "103": "TSI",
  "104": "POL"
};

return stuff[Text($feature.Type)]

kenbuja

Also note that I modified the first response to include that you also have to convert the numeric attribute to a string to return a value in the Dictionary.

kenbuja

Here's an example using the sample dataset in the Playground (with the first key changed to "1" to get a result)

// Returns the first feature in the layer
var feat = First(
  // Fetches features from a public portal item
  FeatureSetByPortalItem(
    Portal("https://www.arcgis.com"),
    // portal item id
    "7b1fb95ab77f40bf8aa09c8b59045449",
    0, // layer id
    ["*"], // fields to include
    false // include or exclude geometry
  )
);

var stuff = {
  "1": "SCC",
  "101": "SEP",
  "4": "CLT",
  "23": "CGS"
};

var keyField = 'HasData'
var lookupKey = Text(feat[keyField]);

return Dictionary(stuff)[lookupKey]

ZacharyHart

I should have mentioned I tried that as well but when doing this I'm given an error of field not found. I know the format for Arcade attribute labels is $feature.fieldname

var stuff = {
  "0": "SCC",
  "101": "SEP",
  "4": "CLT",
  "23": "CGS",
  "8": "CTR",
  "7": "CTH",
  "14": "DSW",
  "9": "ECT",
  "5": "FTH",
  "21": "GPS",
  "10": "GSL",
  "3": "ITH",
  "22": "ITS",
  "13": "ISH",
  "20": "OSR",
  "17": "PTC",
  "26": "PCT",
  "24": "SAL",
  "18": "STC",
  "15": "SWR",
  "19": "STR",
  "6": "TFA",
  "12": "3SS",
  "11": "2SS",
  "100": "GPE",
  "25": "WHI",
  "102": "RET",
  "103": "TSI",
  "104": "POL"
};

var keyField = "Type"; 

// Look up the value based on the key from the field
var lookupKey = $feature[keyField];
var lookupResult = Dictionary(stuff)[lookupKey];
return lookUpResult;

kenbuja

A key in the dictionary must be a string, not a number. You'll have to convert your field value to a string, in addition. Here's an example that works.

var stuff = {
  "0": "SCC",
  "101": "SEP",
  "4": "CLT",
  "23": "CGS"
};

var test = Text(0);
var lookupResult = Dictionary(stuff)[test]

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