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What are Events?

All the different visitor's actions that a web page can respond to are called events.

An event represents the precise moment when something happens.

Examples:

  • moving a mouse over an element
  • selecting a radio button
  • clicking on an element

The term "fires" is often used with events. Example: "The keypress event fires the moment you press a key".

Here are some common DOM events:

Mouse Event Keyboard Event Form Event Document/Windows Event
click keypress submit load
dblclick keyup change resize
mouseenter keydown focus scroll
mouseleve   blur unload

 

jQuery Syntax For Event Methods

In jQuery, most DOM events have an equivalent jQuery method.

To assign a click event to all paragraphs on a page, you can do this:

$("p").click();

The next step is to define what should happen when the event fires. You must pass a function to the event:

$("p").click(function(){
// action goes here!!
});

Commonly Used jQuery Event Methods

$(document).ready()

The $(document).ready() method allows us to execute a function when the document is fully loaded. This event is already explained in the jQuery Syntax chapter.

click()

The click() method attaches an event handler function to an HTML element.

The function is executed when the user clicks on the HTML element.

The following example says: When a click event fires on a <p> element; hide the current <p> element:

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("p").click(function(){
    $(this).hide();
  });
});
</script>
</head>
<body>

<p>If you click on me, I will disappear.</p>
<p>Click me away!</p>
<p>Click me too!</p>

</body>
</html>

dblclick()

The dblclick() method attaches an event handler function to an HTML element.

The function is executed when the user double-clicks on the HTML element:

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("p").dblclick(function(){
    $(this).hide();
  });
});
</script>
</head>
<body>
<p>If you double-click on me, I will disappear.</p>
<p>Click me away!</p>
<p>Click me too!</p>
</body>
</html>

mouseenter()

The mouseenter() method attaches an event handler function to an HTML element.

The function is executed when the mouse pointer enters the HTML element:

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("#p1").mouseenter(function(){
    alert("You entered p1!");
  });
});
</script>
</head>
<body>
<p id="p1">Enter this paragraph.</p>
</body>
</html>

mouseleave()

The mouseleave() method attaches an event handler function to an HTML element.

The function is executed when the mouse pointer leaves the HTML element:

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("#p1").mouseleave(function(){
    alert("Bye! You now leave p1!");
  });
});
</script>
</head>
<body>
<p id="p1">This is a paragraph.</p>
</body>
</html>

mousedown()

The mousedown() method attaches an event handler function to an HTML element.

The function is executed, when the left mouse button is pressed down, while the mouse is over the HTML element:

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("#p1").mousedown(function(){
    alert("Mouse down over p1!");
  });
});
</script>
</head>
<body>
<p id="p1">This is a paragraph.</p>
</body>
</html>

mouseup()

The mouseup() method attaches an event handler function to an HTML element.

The function is executed, when the left mouse button is released, while the mouse is over the HTML element:

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("#p1").mouseup(function(){
    alert("Mouse up over p1!");
  });
});
</script>
</head>
<body>
<p id="p1">This is a paragraph.</p>
</body>
</html>

hover()

The hover() method takes two functions and is a combination of the mouseenter() and mouseleave() methods.

The first function is executed when the mouse enters the HTML element, and the second function is executed when the mouse leaves the HTML element:

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("#p1").hover(function(){
    alert("You entered p1!");
    },
    function(){
    alert("Bye! You now leave p1!");
  }); 
});
</script>
</head>
<body>
<p id="p1">This is a paragraph.</p>
</body>
</html>

focus()

The focus() method attaches an event handler function to an HTML form field.

The function is executed when the form field gets focus:

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("input").focus(function(){
    $(this).css("background-color","#cccccc");
  });
  $("input").blur(function(){
    $(this).css("background-color","#ffffff");
  });
});
</script>
</head>
<body>
Name: <input type="text" name="fullname"><br>
Email: <input type="text" name="email">
</body>
</html>

blur()

The blur() method attaches an event handler function to an HTML form field.

The function is executed when the form field loses focus:

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("input").focus(function(){
    $(this).css("background-color","#cccccc");
  });
  $("input").blur(function(){
    $(this).css("background-color","#ffffff");
  });
});
</script>
</head>
<body>
Name: <input type="text" name="fullname"><br>
Email: <input type="text" name="email">
</body>
</html>

 

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