Checking if a Topic Exists

You can check if a certain topic already exists from your mobile application.

The following example checks if the specified topic already exist in an application scope (you can similarly check the topic existence in a user and group scopes).

// Instantiate the target topic.
var topic = Kii.topicWithName("SendingAlert");

// Check if the topic exists.
topic.exists().then(
  function(existed) {
    if (existed) {
      // The topic already exists.
    } else {
      // The topic does not exist.
    }
  }
).catch(
  function(error) {
    // Handle the error.
    var theTopic = error.target;
    var errorString = error.message;
  }
);

// Instantiate the target topic.
var topic = Kii.topicWithName("SendingAlert");

// Check if the topic exists.
topic.exists({
  success: function(existed) {
    if (existed) {
      // The topic already exists.
    } else {
      // The topic does not exist.
    }
  },
  failure: function(errorString) {
    // Handle the error.
  }
});

This is the brief explanation of the sample code:

Get an instance of the topic that you want to check if it exists.
Execute the exists method to check if the topic exists or not.