CODEWITHSUNDEEP
javascript
Aj1
Aj1

Reputation: 973

How test if a particular line of JavaScript code is supported by Browser

Could anybody suggest how can I test if a particular line of JavaScript code is supported by Browser or not. If not how can I handle it? As I am learning JavaScript it would be a great help to know.

Upvotes: 1

Views: 204

Answers (2)

David Thomas
David Thomas

Reputation: 253486

This would seem to be the perfect time to use try/catch:

    try {
        // your JavaScript here
        document.executeSomeUnknownFunction();
    }
    catch (error) {
        console.log("There was an error: " + error);
    }

console.log("...but nothing broke");

Or, alternatively, assuming it's a method of an Object you're testing for (for example querySelectorAll()):

if ('querySelectorAll' in document) {
  console.log("We support  'document.querySelectorAll()'");
 }

References:

Upvotes: 3

JCOC611
JCOC611

Reputation: 19759

You can either: 1) Assume that the code works, and handle the cases where it doesn't:

try{
   // ...
}catch(e){
   // an error occurred
}

Or 2) check if the function it relies on exists, and then use it:

if(window.yourfunction){
   // The function is present in the global scope
}else{
   // Not available, try alternatives?
}

Upvotes: 2

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