JavaScript/Notes/IBD: Difference between revisions
Jump to navigation
Jump to search
| Line 6: | Line 6: | ||
==== Event Name as a Property ==== | ==== Event Name as a Property ==== | ||
Each event is a property name. The value is | Each event is a property name. The value is a function or null. | ||
<source lang="javascript"> | <source lang="javascript"> | ||
Revision as of 04:43, 1 November 2013
Interface Based Design
Registering event handlers.
Two ways to Register Events
An event is a notification that something has occurred.
Event Name as a Property
Each event is a property name. The value is a function or null.
<source lang="javascript"> el["onclick"] = function(ev) {
alert(this);
}; </source> Custom objects <source lang="javascript"> userPicker.onuserselected= function(ev) {
console.log(ev.user + " chosen.");
}; </source>
Event Listener Interface
<source lang="javascript"> el.addEventListener("click", function(ev) {
alert("clicked");
}, false); </source>
Custom objects <source lang="javascript"> userPicker.addCallback("onuserselected", function(ev) {
console.log(ev.user + " chosen.");
}); </source>