free barcode font for asp net Let s take a quick look at what these events do in Java

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Let s take a quick look at what these events do
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load event The onload event handler is called when the HTML document finishes
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loading into the browser window This event is commonly relied on to do any initialization required in the document For instance, if form fields need to be preloaded with text, and that was not covered by the HTML code itself, it is best to wait until the document is fully loaded before initializing those fields
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unload event The unload event fires when a browser is leaving the current document
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This happens when the browser window is being closed or the user has moved on to another document The main purpose of this event is to perform cleanup tasks before the document closes The unload event is commonly used in some of the seedier web locations to provide final pop-up advertising before a user leaves a web site This is generally considered bad etiquette The unload event should be avoided unless absolutely necessary
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submit event The submit event occurs just before a form is submitted to a web server
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It is common to capture this event to perform edit checking before allowing a form submission to continue Since this event can be canceled, JavaScript can stop the form from being processed if everything is not in order
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reset event The reset event occurs when the reset button on a form is clicked The reset
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button clears a form by resetting all the values back to their defaults
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How to Do Everything with JavaScript
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select event The select event occurs when the user selects text inside a text box or text
area Text can be selected by holding the left mouse button down while dragging across the text or by holding the SHIFT key down while using the arrow keys to move the cursor across the text
change event The change event occurs when a control loses focus (the user tabs out of
it) and its value has been altered This way, in text boxes the change event does not fire for each and every keystroke when a user is entering a value but only when the user leaves the field This same event fires on radio buttons, check boxes, and select lists in the same manner
abort event The abort event occurs when the browser stops trying to load an image
on the web page This can occur when the user hits the browser s Stop button or clicks a link to go to another page In my experience, this event is rarely used
error event The error event occurs when an error happens while the web page is being
loaded This could be an error specific to a particular object (such as a Java applet s failing to load) or a run-time error caused by poorly written JavaScript code This is another event that is rarely captured in most web pages
resize event The resize event fires when an object is being resized for instance, if a
browser window has been resized by the user, or a frame There may be times when you would like to be able to resize the individual controls inside the window based on the available space, although capturing this event is still rare
scroll event For web objects that scroll, such as the browser window or a text area form
control, the scroll event is fired anytime the object s scroll bar is changed This can be done using the mouse to move the scroll bar manually, by using arrow keys, or by other means The following code demonstrates how the load event can be captured using the onload event handler Our web page contains a form, and the onload event handler code populates a list box on that form with some predefined values
<html> <head> <title>JavaScript Sample Web Page</title> <script language="JavaScript" type="text/javascript"> <!-- // Begin function initialize() { var lst = documentgetElementById("samplelist"); var opn = new Array(20); var temp; var counter; for (counter = 1; counter <= 10; counter++) { opn[counter] = documentcreateElement("option"); lstoptionsadd(opn[counter]); temp = counter * 10; opn[counter]innerText = temptoString();
CHAPTER 9: Handle Browser Events
} } // End --> </script> </head> <body onload="initialize()"> <h1>Initialize a Form with onload</h1> <form action="#"> <select id="samplelist"></select> </form> </body> </html>
In the preceding HTML code, the browser calls the JavaScript initialize() function as soon as it finishes loading into the browser window This is done by programming the onload event handler in the <body> tag Inside the initialize() function, the program adds 10 items to the empty <select> list box defined in the body of the web page We can see the results of this function in Figure 9-4
FIGURE 9-4
Ten items have been added to the drop-down list box
How to Do Everything with JavaScript
Handle Events Using the Event Property
There are two ways to set the JavaScript event handler for an HTML tag:
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