HTML and CSS Reference
In-Depth Information
EXPLANATION
(
CONTINUED
)
16
The function
addBlog()
is a user-defined function, not part of the class. Its func-
tion is to create a new
blog
object and assign it properties.
17
The form data (the blogger's name and blog message) is retrieved with the
document.getElementById()
method.
18
An instance of a new
BlogEntry
object is created and a reference to it is assigned
to the variable,
blog
. The methods for the object are called to set the properties for
the
blog
object.
19
After setting up all the weather images, this is the
div
container where the blog
messages will be stored and displayed.
20
The user will write his or her blog in a
textarea
input device. After writing the mes-
sage, if the user leaves the text area and then clicks in the box, the
onfocus
event
handler will be triggered and the box will be cleared by setting its value to an emp-
ty string.
21
When the user clicks this button, the
onclick
event hander will call the
addBlog()
function to create a new blog object and set its properties with the form data re-
trieved on line 17. The results are shown in Figures 15.18 and 15.19.
Figure 15.18
Before adding a blog entry.
