Button.removeEventListener()

By Opera Software

Description:

This method removes a listener from receiving an event.

Parameters:

• type: Type of event; allowed values are: click and remove.
• eventListener: The function to be removed.
• useCapture: Boolean; should be kept as false for now. Note: this value currently has no purpose.

Syntax:

void removeEventListener()

Example:

//
// The background process (e.g. index.html)
//

// Set the button's properties
var properties = {
  disabled: false,
  title: "My Test Extension",
  icon: "icon.18x18.png"
};	

// Add the button to the browser UI
var button = opera.contexts.toolbar.createItem(properties);
opera.contexts.toolbar.addItem(button);

// Attach the click handler to the button
var i = 1; 
button.addEventListener('click', handleClick, false);

function handleClick() {
  // If clicked more than five times, stop counting. 
  if (i > 5) {
    button.title = "You've clicked the button more than 5 times";
    button.removeEventListener('click', handleClick, false);
    return;
  }

  // Update the button title
  button.title = "You've clicked the button " + i + " time(s)"; 
  i++;
}

This article is licensed under a Creative Commons Attribution 3.0 Unported license.