JavaScript Examples Bible - UserWorks Technologies

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JavaScript Examples Bible: The Essential Companion to JavaScript Bible
Listing 16-28: Printing Control
Print()
If you don’t like some facet of the printed output, blame the browser’s print
engine, and not JavaScript. The print() method merely invokes the browser’s regular
printing routines. Pages whose content is generated entirely by JavaScript
print only in NN3+ and IE4+.
prompt(“message”, “defaultReply”)
windowObject.prompt()
NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5
Compatibility ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Example
The function that receives values from the prompt dialog box in Listing 16-29
(see the dialog box in Figure 2-8) does some data-entry validation (but certainly not
enough for a commercial site). The function first checks to make sure that the
returned value is neither null (Cancel) nor an empty string (the user clicked OK
without entering any values). See Chapter 43 of the JavaScript Bible for more about
data-entry validation.
Listing 16-29: The Prompt Dialog Box
window.prompt() Method
function populateTable() {
var howMany = prompt(“Fill in table for how many factors?”,””)
if (howMany != null && howMany != “”) {