What is an Event ?
VBScript's interaction with HTML is handled through events that occur when the user or browser manipulates a page.
When the page loads, that is an event. When the user clicks a button, that click too is an event. Another example of events are like pressing any key, closing window, resizing window, etc.
Developers can use these events to execute VBScript coded responses, which cause buttons to close windows, messages to be displayed to users, data to be validated and virtually any other type of response imaginable to occur.
Events are a part of the Document Object Model (DOM) and every HTML element has a certain set of events, which can trigger VBScript Code. Please go through this small tutorial for a better understanding HTML Event Reference. Here, we will see few examples to understand a relation between Event and VBScript.
onclick Event Type:
This is the most frequently used event type, which occurs when a user clicks mouse's left button. You can put your validation, warning, etc., against this event type.
<html> <head> <script language="vbscript" type="text/vbscript"> Function sayHello() msgbox "Hello World" End Function </script> </head> <body> <input type="button" onclick="sayHello()" value="Say Hello"/> </body> </html>
This will produce the following result, and when you click Hello button, then onclick event will occur which will trigger sayHello() function.
onsubmit event type:
Another most important event type is onsubmit. This event occurs when you try to submit a form. So you can put your form validation against this event type.
The Form is submitted by clicking on Submit button, the message box appears.
<html> <head> </head> <body> <script language="VBScript"> Function fnSubmit() Msgbox("Hello Tutorialspoint.Com") End Function </script> <form action="/cgi-bin/test.cgi" method="post" name="form1" onSubmit="fnSubmit()"> <input name="txt1" type="text"><br> <input name="btnButton1" type="submit" value="Submit"> </form> </script> </body> </html>
onmouseover and onmouseout:
These two event types will help you to create nice effects with images or even with text as well. The onmouseover event occurs when you bring your mouse over any element and the onmouseout occurs when you take your mouse out from that element.
<html> <head> </head> <body> <script language="VBScript"> Function AlertMsg Msgbox("ALERT !") End Function Function onmourse_over() Msgbox("Onmouse Over") End Function Sub txt2_OnMouseOut() Msgbox("Onmouse Out !!!") End Sub Sub btnButton_OnMouseOut() Msgbox("onmouse out on Button !") End Sub </script> <form action="page.cgi" method="post" name="form1"> <input name="txt1" type="text" OnMouseOut="AlertMsg()"><br> <input name="txt2" type="text" OnMouseOver="onmourse_over()"> <br><input name="btnButton" type="button" value="Submit"> </form> </body> </html>
This will produce a result when you hover the mouse over the text box and also when you move the focus away from the text box and the button.
HTML 4 Standard Events
The standard HTML 4 events are listed here for your reference. Here, script indicates a VBscript function to be executed against that event.
|onchange||script||Script runs when the element changes|
|onsubmit||script||Script runs when the form is submitted|
|onreset||script||Script runs when the form is reset|
|onblur||script||Script runs when the element loses focus|
|onfocus||script||Script runs when the element gets focus|
|onkeydown||script||Script runs when key is pressed|
|onkeypress||script||Script runs when key is pressed and released|
|onkeyup||script||Script runs when key is released|
|onclick||script||Script runs when a mouse click|
|ondblclick||script||Script runs when a mouse double-click|
|onmousedown||script||Script runs when mouse button is pressed|
|onmousemove||script||Script runs when mouse pointer moves|
|onmouseout||script||Script runs when mouse pointer moves out of an element|
|onmouseover||script||Script runs when mouse pointer moves over an element|
|onmouseup||script||Script runs when mouse button is released|