JavaScript
Alerts
by Taylor Pennington aka DigitalPimp
This is an introduction in using Javascript
with a web page. I am first off going to show you how to
write a function in Javascript and then I will show you how
to call it out using HTML. Javascript is A LOT like
ActionScript, it uses dot notation and functions.
Anywho, let's get to learning, first off
let's dissect a function. A function is something that you
make to process data or create an action. In this case we
are going to do the simple of simple functions, we are just
going to make an alert pop-up. Alerts are very useful and
are similar to the trace feature in AS.
The Code:
Copy and paste that code
into a HTML page. Now that we have written the function we
need to write some code on the page to activate or 'set it
off' if you the will the function because the browser has
processed the function but it doesn't know when to make the
function process. This is similar to doing an onRelease or
onClipEvent in AS.
What we are going to do is use a hyperlink
to set off this function. Now in a hyperlink you have many
many actions that you can do to activate it just like in AS.
These are all the events:
- onBlur
- onClick
- onFocus
- onDblClick
- OnMouseOut
- OnMouseOver
- OnMouseDown
- OnMouseUp
To use the above actions, you will need
to, as mentioned earlier, call them. The following syntax
can be used:
<a
event="functionName"
href="javascript:void(0)">Click Me</a>
So, if you want to call the onClick
example, your code will look similar to the following line
of code:
<a
onClick="alertUser()"
href="javascript:void(0)">Click Me</a>
The event is onClick and the name of our
function is alertUser(). I told you this would not be very
complicated. The following list displays all of the
aforementioned events as examples for you to interact with:
-
onBlur
To see this work, click on the link and then click else on
the document. When you select the link, the focus (the
dotted rectangle) goes around this link, but when you
click elsewhere, the focus leaves. When that occurs - the
code gets invoked.
-
onClick
To see this work, just click it.
-
onFocus
To see this work, this is like a click but it is when you
set focus to the object. This isn't really meant for a
hyperlink but more for other objects like a <TD> or
<SPAN>. If you notice you can right-click on this
hyperlink or even tab to it.
-
onDblClick
To see this work, double-click on it.
-
onMouseOut
To see this work, put your mouse over this object and then
take your mouse off of it.
-
onMouseOver
To see this work, this is like onMouseOver but doesn't
process the function until after your mouse is removed.
-
onMouseDown
To see this work, this is just like a onFocus or onClick,
this also is meant for other objects but does work with a
hyperlink. If you notice you can right-click on this
hyperlink and it will still process the action.
-
onMouseUp
To see this work, this is just like a onMouseDown but the
process doesn't happen until the mouse button is let go.
If you notice you can right-click on this hyperlink and it
will still process the action.
If you have any questions,
feel free to post you in the Scripting forum for help.
Much Respect,
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