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Tolerim
a month ago

How come data is not returned by JSON.stringify()?

In the new version of Zebra mobile Enterprise browser 3.3 EB, JavaScript objects can be dumped for informational purposes. This modern browser is based on webkit and runs on Android 11. The Log object was attempted to be dumped using JSON.stringify(EB.Log), but it output undefined. However, accessing object properties by name such as EB.Log.filePath or EB.Application.version returns proper data. The question now is how to dump the entire object content when the property names are unknown, retrieving as much data as possible. JSON.stringify() is effective for some Enterprise browser API objects, like EB.Battery.batteryStatus({}) and EB.SignalIndicators.wlanStatus(). Additionally, for the EB.SmartCradle object, getAllProperties() returns data. For other objects, such as EB.Log, EB.Application, and EB.Barcode.getSupportedProperties(), JSON.stringify does not return data. Using Object.getOwnPropertyNames returns undefined. Both Application and Log objects do not have getAllProperties() and getSupportedProperties() methods. Hence, accessing properties by name works, but their changing API may lead to the failure of retrieval. Furthermore, the mobile browser console is challenging to access; therefore, object data must retrieve using JavaScript. In summary, what is the approach to be utilized to dump the javascript object for human-readable purposes?
Answers(2)
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Vogi
a month ago
Verified Answer
You can use the console.dir() method in JavaScript to dump the contents of an object to the debugging console. This method is available in recent browsers. Another way is to use the JSON.stringify() method. However, this method is effective for some Enterprise browser API objects, like EB.Battery.batteryStatus({}) and EB.SignalIndicators.wlanStatus(). For other objects, such as EB.Log, EB.Application, and EB.Barcode.getSupportedProperties(), JSON.stringify() does not return data. Using Object.getOwnPropertyNames() returns undefined. Both Application and Log objects do not have getAllProperties() and getSupportedProperties() methods. Hence, accessing properties by name works, but their changing API may lead to the failure of retrieval. I hope this helps!

Sources

Print content of JavaScript object? - Stack OverflowC#: Printing all properties of an object - Stack OverflowRemoving Object Properties with Destructuring - Ultimate CoursesWhat is the best way to dump entire objects to a log in C#?
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Tolerim
a month ago
You can use console.dir() method to dump the entire contents of an object for informational purposes. This method allows you to print the properties of an object in a tree-like structure so that you can easily view the contents of the object. Here's an example of how you can use console.dir() to dump the contents of EB.Log object: 
console.dir(EB.Log);
This will output the contents of the EB.Log object in the console in a tree-like structure, making it easy to view the contents of the object. Alternatively, you could also use JSON.stringify() method with a custom replacer function to convert the object to a readable string. Here's an example: 
console.log(JSON.stringify(EB.Log, (key, value) => {
  if (value instanceof HTMLElement || key === 'target') {
    return;
  }
  return value;
}, 2));
In this example, we are passing a custom replacer function as the second argument to JSON.stringify(). The replacer function checks if value is an instance of HTMLElement or if key is 'target', which is the default property for event objects, and removes them from the stringified output. The replacer function also uses 2 as the third argument to JSON.stringify() to add indentation to the output. These methods should help you retrieve the contents of JavaScript objects in a human-readable form for informational purposes.
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