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Criando um novo recurso a partir de uma lista de campos com valores SIM ou NÃO usando o Editor de Expressões para pop-ups

Anonymous User

Olá, pessoal,

Tenho um mapa da web no ArcGIS Online que obtém os dados de um serviço REST. O serviço REST mostra as feiras de produtores rurais ativas no meu estado e lista os meses em que cada feira funciona de uma forma extremamente complicada. A captura de tela anexada mostra que cada feira tem um valor SIM ou NÃO listado 12 vezes diferentes no pop-up de uma única feira. Quero consolidar todos esses valores SIM e NÃO em um novo recurso que simplesmente indique em quais meses a feira funciona.

Este é o pop-up dessa feira, como aparece em um painel, que será a aplicação final deste mapa.

Quero apenas que o pop-up informe algo como “Aberta em: junho, julho, agosto, setembro” para cada feira em que você clicar.

Vale observar que não tenho acesso pela minha organização para fazer alterações nos serviços REST. Por isso, preciso de uma solução alternativa.

Talvez eu esteja usando a palavra “recurso” de forma incorreta como solução para o meu problema, então fique à vontade para me corrigir também. Minha ideia para contornar o problema era usar as funções feature ou featureset no editor de expressões para criar um novo recurso que fizesse referência às 12 colunas existentes com os dados mensais de todos os aproximadamente 360 mercados. Tenho tentado aprender a escrever uma expressão Arcade que faça isso nos últimos dias, mas todas as funções diferentes estão me deixando confuso, e nunca tentei programar em nenhuma linguagem antes. Ainda estou na etapa de entender como funciona a sintaxe, haha!

@XanderBakker Espero que não se importe que eu tenha marcado você! Vi que você ofereceu uma solução aparentemente parecida para o problema mencionado aqui. Pensei que talvez você fosse a pessoa certa para pedir ajuda!

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Accepted answers

XanderBakker

Hi @Anonymous User ,

I think you could use something like this:

// create a disctionary with field names and month names (change the field names!)
var dct = {"OpenJan": "January", "OpenFeb": "February",
           "OpenMar": "March", "OpenApr": "April", 
		   "OpenMay": "May", "OpenJun": "June",
		   "OpenJul": "July", "OpenAug": "August",
		   "OpenSep": "September", "OpenOct": "October",
		   "OpenNov": "November", "OpenDec": "December"};

// start with an empty result string
var result = "";

// loop through field names in dct
for (var fldname in dct) {
	// read the value of the field
	var fldval = $feature[fldname];
	// validate if the value is YES
	if (fldval == "YES") {
		// add the month to the result
		if (result == "") {
			// first month
			result = "Open in: " + dct[fldname];
		} else {
			// any next month
			result += ", " + dct[fldname];	
		}
	}
}

return result;	‍
‍

XanderBakker

Hi @Anonymous User ,

A simple fix could be this:

// create a disctionary with field names and month names (change the field names!)
var dct = {"OpenJan": "January", "OpenFeb": "February",
           "OpenMar": "March", "OpenApr": "April", 
		   "OpenMay": "May", "OpenJun": "June",
		   "OpenJul": "July", "OpenAug": "August",
		   "OpenSep": "September", "OpenOct": "October",
		   "OpenNov": "November", "OpenDec": "December"};

// simple fix, use a list of field names with the right order
var lst = ["OpenJan", "OpenFeb", "OpenMar", "OpenApr", 
		   "OpenMay", "OpenJun", "OpenJul", "OpenAug",
		   "OpenSep", "OpenOct", "OpenNov", "OpenDec"];

// start with an empty result string
var result = "OK";

// start with an empty result string
var result = "";

// loop through the list of field names
for (var i in lst) {
    var fldname = lst[i];
	// read the value of the field
	var fldval = $feature[fldname];
	// validate if the value is YES
	if (fldval == "YES") {
		// add the month to the result
		if (result == "") {
			// first month
			result = dct[fldname];
		} else {
			// any next month
			result += ", " + dct[fldname];	
		}
	}
}

return result;

All comments

XanderBakker

Hi @Anonymous User ,

I think you could use something like this:

// create a disctionary with field names and month names (change the field names!)
var dct = {"OpenJan": "January", "OpenFeb": "February",
           "OpenMar": "March", "OpenApr": "April", 
		   "OpenMay": "May", "OpenJun": "June",
		   "OpenJul": "July", "OpenAug": "August",
		   "OpenSep": "September", "OpenOct": "October",
		   "OpenNov": "November", "OpenDec": "December"};

// start with an empty result string
var result = "";

// loop through field names in dct
for (var fldname in dct) {
	// read the value of the field
	var fldval = $feature[fldname];
	// validate if the value is YES
	if (fldval == "YES") {
		// add the month to the result
		if (result == "") {
			// first month
			result = "Open in: " + dct[fldname];
		} else {
			// any next month
			result += ", " + dct[fldname];	
		}
	}
}

return result;	‍
‍

Anonymous User

You're a wizard! It worked perfectly besides listing a couple months in the wrong order, but I can manage fixing that myself I think.

One more piece of help please! It lists the months in alphabetical order instead of by the order of months in a year. I try and type some solutions to this into your code but I can't seem to do anything other than break it. What to do? @XanderBakker

XanderBakker

Hi @Anonymous User ,

Glad to hear that it helped. If you run into problems with making the required changes just let me know.

About your questions:

For example, why use this method instead of creating an entire new feature?
- I wonder how you would create a new feature if you are not the owner of the data. You could with a notebook access the data, transform it the way you need it, and write a local feature layer and use that. This is more complex to implement.
What was the purpose of starting the logic part of the expression with "an empty results string?"
- Any variable you want to assign a value needs to be initialized. This is done using "var NameOfVariable = InitialValue". Perhaps this could be omitted and line 21 could start with "var ". However, sometimes this could create an error when compiling the code, so I prefer to initialize the variable before the loop.
Finally, what exactly do the "{" and "}" symbols do in this expression?
- The "{" and "}" are used to contain logic that needs to be executed. It also helps the readability of the code. To learn more about Arcade you could follow the learn path: https://learn.arcgis.com/en/paths/try-arcade/

Anonymous User

Thanks for your explanations. I will be sure to explore the resources you linked to asap.

One more piece of help please! It lists the months in alphabetical order instead of by the order of months in a year. What to do? @XanderBakker

XanderBakker

Hi @Anonymous User ,

Can you share the expression you have now?

XanderBakker

Hi @Anonymous User ,

A simple fix could be this:

// create a disctionary with field names and month names (change the field names!)
var dct = {"OpenJan": "January", "OpenFeb": "February",
           "OpenMar": "March", "OpenApr": "April", 
		   "OpenMay": "May", "OpenJun": "June",
		   "OpenJul": "July", "OpenAug": "August",
		   "OpenSep": "September", "OpenOct": "October",
		   "OpenNov": "November", "OpenDec": "December"};

// simple fix, use a list of field names with the right order
var lst = ["OpenJan", "OpenFeb", "OpenMar", "OpenApr", 
		   "OpenMay", "OpenJun", "OpenJul", "OpenAug",
		   "OpenSep", "OpenOct", "OpenNov", "OpenDec"];

// start with an empty result string
var result = "OK";

// start with an empty result string
var result = "";

// loop through the list of field names
for (var i in lst) {
    var fldname = lst[i];
	// read the value of the field
	var fldval = $feature[fldname];
	// validate if the value is YES
	if (fldval == "YES") {
		// add the month to the result
		if (result == "") {
			// first month
			result = dct[fldname];
		} else {
			// any next month
			result += ", " + dct[fldname];	
		}
	}
}

return result;

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