I have an issue facing me on a string in Flutter, specifically in a URL that includes '$' char.
Is there any way to escape the dollar sign $
?
var url = Uri.parse('https://olinda.bcb.gov.br/olinda/servico/Expectativas/versao/v1/odata/ExpectativaMercadoMensais?$top=100&$skip=0&$orderby=Data desc&$format=json&$select=Indicador,DataReferencia,Mediana,baseCalculo');
CodePudding user response:
Dart has something called String Interpolation. Here's a snippet from the docs:
To put the value of an expression inside a string, use
${expression}
. If the expression is an identifier, you can omit the{}
.Here are some examples of using string interpolation:
String Result '${3 2}'
'5'
'${"word".toUpperCase()}'
'WORD'
'$myObject'
The value of myObject.toString()
In your case, the URL string contains exactly the escape symbol $
to make a String interpolation. Dart thinks all words after the $
symbol are identifiers (variables, functions etc.) but it doesn't find them defined anywhere. To fix it just do what @jamesdlin suggested: Escape the $
symbols like \$
or prefix the string with r
like below:
r'https://...Mensais?$top=100&$skip=0&$orderby=...'
.
CodePudding user response:
Use this instead
var url = Uri.parse( 'https://olinda.bcb.gov.br/olinda/servico/Expectativas/versao/v1/odata/ExpectativaMercadoMensais?\$top=100&\$skip=0&\$orderby=Data desc&\$format=json&\$select=Indicador,DataReferencia,Mediana,baseCalculo');
Use a reverse slash to escape string