[Solved] How to check if object in for loop exists in JS? [closed]

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In javascript you can check existence of any object just by calling a condition with it 

if (data.sources[i]) {
  // Do whatever you want here, even call data.sources[i].id
}

So for you code if you want to check existence of those objects it would become like this:

for (var i = 0; i < data.sources.length; i++) {
  if (data.sources[i] && domainid[i]) {
    selectBoxSource += '<option value="' + data.sources[i].id + '">' + 
      domainid[i].source + '</option>';
  }
}

A higher level of validation would be

for (var i = 0; i < data.sources.length; i++) {
  if (data.sources[i] && data.sources[i].id && domainid[i] && domainid[i].source) {
    selectBoxSource += '<option value="' + data.sources[i].id + '">' + 
      domainid[i].source + '</option>';
  }
}

solved How to check if object in for loop exists in JS? [closed]