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Arcade expression to decode values

AndrewL

I am trying to use an Arcade expression to display coded values in a popup in ArcGIS Online, but it is not working. I am using the code from the decode example. It does not display in the popup. No error message is given in the popup.

var code = $feature.dn;
var decodedValue = Decode(code, 2, 'Non-Severe', 3, 'Marginal', 4, 'Slight', 'Other');

I am not the author of the map service. The dn field is an esriFieldTypeDouble. Thank you.

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Accepted answers

kenbuja

You needed to state what value to return. See the documentation about this.

<SPAN class="keyword token">var</SPAN> code <SPAN class="operator token">=</SPAN> $feature<SPAN class="punctuation token">.</SPAN>dn<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> decodedValue <SPAN class="operator token">=</SPAN> <SPAN class="token function">Decode</SPAN><SPAN class="punctuation token">(</SPAN>code<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Non-Severe'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Marginal'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Slight'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Other'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
decodedValue<SPAN class="punctuation token">;</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍&nbsp; <SPAN class="comment token">//return decodedValue; also works‍‍‍</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

or it could be a single line expression.

<SPAN class="token function">Decode</SPAN><SPAN class="punctuation token">(</SPAN>$feature<SPAN class="punctuation token">.</SPAN>dn<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Non-Severe'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Marginal'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Slight'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Other'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>‍‍‍‍
<SPAN class="comment token">// return Decode($feature.dn, 2, 'Non-Severe', 3, 'Marginal', 4, 'Slight', 'Other');‍‍‍‍ to be more explicit</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

AndrewL

Great! Thanks, that worked.

kenbuja

You needed to state what value to return. See the documentation about this.

<SPAN class="keyword token">var</SPAN> code <SPAN class="operator token">=</SPAN> $feature<SPAN class="punctuation token">.</SPAN>dn<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> decodedValue <SPAN class="operator token">=</SPAN> <SPAN class="token function">Decode</SPAN><SPAN class="punctuation token">(</SPAN>code<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Non-Severe'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Marginal'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Slight'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Other'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
decodedValue<SPAN class="punctuation token">;</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍&nbsp; <SPAN class="comment token">//return decodedValue; also works‍‍‍</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

or it could be a single line expression.

<SPAN class="token function">Decode</SPAN><SPAN class="punctuation token">(</SPAN>$feature<SPAN class="punctuation token">.</SPAN>dn<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Non-Severe'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Marginal'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Slight'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Other'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>‍‍‍‍
<SPAN class="comment token">// return Decode($feature.dn, 2, 'Non-Severe', 3, 'Marginal', 4, 'Slight', 'Other');‍‍‍‍ to be more explicit</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

AndrewL

Sure it is a public service from NWS: Layer: Day 1 Convective Outlook (ID: 1)

Possible values are 2, 3, 4, 5, 6, and 7.

kenbuja

What are the values that are possible for dn? Can you share that service or provide a list of some of the values?

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