Javascript catch error within console and callback message

Question

I have this function which is a search query. This works fine unless the query string name is not detailed enough which then throws up an error message

request( url, function (error, data) {
errorText = arguments['0'];
  if (error) {
      callback('Unable to connect to location services!', undefined)
  } else if (errorText.includes('Cannot read property')) {
      callback ('Unable to find location, try another search.', undefined)
  } 
  else {
    callback( {
      data = data.body,
      namePlace: data.suggestions[1].entities[0].name,
      idPlace: data.suggestions[1].entities[0].destinationId,
      })
   } 
})

The error message from the console is

namePlace: data.suggestions[1].entities[0].name,
                                           ^
TypeError: Cannot read property 'name' of undefined

I want to be able to capture this error message and callback 'Unable to find location, try another search.'

Can you provide a minimal reproducible example preferably in a Stack snippet? — Timothy Alexis Vass
– Timothy Alexis Vass, Commented Jul 30, 2021 at 18:06

David · Accepted Answer · 2021-07-30 17:55:52Z

1

It sounds like what you want to check for is whether data.suggestions[1].entities has any entries. Perhaps something like:

else if (data.suggestions[1].entities.length === 0) {
  callback('Unable to find location, try another search.', undefined)
}

Depending on how reliable the resulting data structure is, you might also check for null or undefined values. But for this particular error it looks like entities is defined and an array but just has no entries.

answered Jul 30, 2021 at 17:55

David

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Timothy Alexis Vass · Accepted Answer · 2021-07-30 18:01:59Z

You need to change the logical order of the first if, otherwise else if (error) will prevent if (errorText.includes('Cannot read property')).

Have you previously defined let request = new Request(<uri>)?

What is it that you're trying to do?

request( url, function (error, data) {
errorText = arguments['0']; // What are you trying to do here?
  if (errorText.includes('Cannot read property')) {
      callback ('Unable to find location, try another search.', undefined)
  } else if (error) {
      callback('Unable to connect to location services!', undefined)
  } else {
    callback( {
      data = data.body, // What are you trying to do here?
      namePlace: data.suggestions[1].entities[0].name, // What are you trying to do here?
      idPlace: data.suggestions[1].entities[0].destinationId,
      })
   } 
}); // <- semicolon here

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