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Here s a trick JavaScript pros use to reduce the amount of typing they have to do when referencing attributes of elements Let s say that you want to access the value attribute of the email element You d write the following:
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windowdocumentformsorderemailvalue
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Suppose you want to access several attributes of the email element Instead of writing the full path, you can use a with statement to save keystrokes when writing your JavaScript Here s the shortcut:
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with(windowdocumentformsorderemail) { alert('Email: ' + value) }
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Figure 7-3 The alert dialog box displays an attribute of an element when the Reset button is clicked
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In this example, the full path is written once at the top of the with statement and is then automatically applied to each attribute within the with statement You can use this same technique to create elements of a form, like so:
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with(windowdocumentformsorder) { alert('Email: ' + mailvalue) }
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You can write other statements in the with statement to reference other elements of the order form without having to write the complete path
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Changing Attribute Values Dynamically
You can spice up any form by changing the attributes of the form element dynamically Let s say that your user/customer wants to modify an existing order Your application displays the order form, and then prompts the customer to make changes You could highlight those changes by altering the color, style, or font of the element after the customer makes the change This gives the customer a visible way of telling what information has changed You can change an attribute of an element by assigning a new value to the attribute from within a JavaScript function The function is then called when an appropriate event occurs In the next example, we ll display the form you saw in a previous example that enables the user to enter a rst and last name and an e-mail address This example displays default values for these elements just as if existing contact information were recalled from a le Whenever the user changes the default value, we ll display the new value in blue instead of black and change the background color from white to silver Here s how this is done First, we de ne a function in the <head> tag called Highlight() This function receives one parameter, which is the name of the element that calls the function The name is compared with the names of each element on the form When a match occurs, statements within the if statement change the text color and background color style attributes of the element by assigning a new value to the style of the element (Figure 7-4) Notice that the Fname element, Lname element, and Email element trap the onchange event The onchange event occurs when the cursor is moved away from the element (that is, it loses input focus) and the value of the element has changed since the last time the cursor was placed on the element (that is, it gained focused) The onchange event happens when the user changes the element and then moves on to another element When the onchange event occurs, the
CHAPTER 7 Forms and Event Handling
Figure 7-4 The color and background color of an element is changed after a user changes the value of the element
Highlight() function is called and is passed the name of the element This would also be rather maintenance-intensive Instead, you can pass in the element itself so the function is more generic
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>Dynamically Changing Element Attributes</title> <script language="Javascript" type="text/javascript"> <!-function Highlight(Element) { Elementstylecolor = 'blue' ElementstylebackgroundColor = 'silver' } --> </script> </head> <body> <FORM name="Contact"
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action="http://wwwjimkeoghcom" method="post"> <P> First Name: <INPUT value="Bob" type="text" name="Fname" onchange="Highlight(this)"/><BR> Last Name: <INPUT value="Smith" type="text" name="Lname" onchange="Highlight(this)"/><BR> Email: <INPUT value="bsmith@mcgrawhillcom" type="text" name="Email" onchange="Highlight(this)"/><BR> <INPUT name="Submit" value="submit" type="submit"/> <INPUT name="Reset" value="Method" type="reset"/> </P> </FORM> </body> </html>
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