I am using the following expression in an ArcGIS feature label:
"(CH<SUB>4</SUB> " + $feature.Methane + " ppm)" This works (e.g., CH4 15 ppm) unless the $feature.Methane value is "<1". In that case the result is
CH<SUB>4</SUB> <1 ppm How do I get around this?
Some symbols such as <, > and " must be encoded similar to how it's done in XML or HTML. So rather than just typing the actual character, use <, > and "
In your example:
CH<SUB>4</SUB> <1 ppm lt stands for lesser than, gt for greater than
When using Arcade for labeling, the output is interpreted as HTML. In this case, the HTML reserved character < is in the field value, and its presence is messing up the HTML interpretation and display of the field value.
Knowing that Arcade labeling is interpreted as HTML, one can create a label expression that encodes the HTML reserved characters to their appropriate HTML entity.
var htmlEncode = Dictionary( '"', """, "'", "'", "&", "&", "<", "<", ">", ">", ); var rawString = "Value <1 or >5. It's me."; for(var char in htmlEncode) { rawString = Replace(rawString, char, htmlEncode[char]); }; return rawString returns
Value <1 or >5. It's me.
<to prevent it from being interpreted as an HTML control character. Try:"(CH<SUB>4</SUB> " + Replace($feature.Methane,"<","<") + " ppm)"