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Arcade Get Field Value Using Variable

VinceE

Need some help understanding Arcade's syntax. The top two lines throw an error, as shown. The bottom one works fine. I'd prefer to not hard-code field names, so using the bracket syntax with a variable would be preferable to the dot notation ($feature.COLOR). What am I missing here?

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Accepted answers

rzufelt

Expects($feature, 'COLOR')
var fieldName = 'COLOR'

$feature[fieldName]

As seen here.

All comments

rzufelt

Sorry, did not post correctly, but I updated it.

Sounds like you got the important part about listing the fields that will be used and got it working.

VinceE

Very helpful, thanks. Seems like I was missing the part where it is necessary to declare the attribute variables from the table that are to be used in the script...?

Expects($feature, 'COLOR')
//$feature.COLOR;

var fieldName = 'COLOR'
return $feature[fieldName]

The documentation, found at the link you provided:

You should explicitly list all field attributes that will be used at the top of the expression. This will ensure the profile will request the appropriate data from required fields so the expression evaluates properly.

$feature.COLLEGE;$feature.POPULATION;
Round(($feature.COLLEGE / $feature.POPULATION) * 100, 2);

Alternatively, you may use the Expects function for this purpose.

Expects($feature, "COLLEGE", "POPULATION");
Round(($feature.COLLEGE / $feature.POPULATION) * 100, 2);

rzufelt

Expects($feature, 'COLOR')
var fieldName = 'COLOR'

$feature[fieldName]

As seen here.

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