java barcode scanner api The confirm() Method in Java

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The confirm() Method
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The confirm() method can be used to give the viewer a chance to confirm or cancel an action This method returns a Boolean value of true or false, so its result is often assigned to a variable when it is used The following is the syntax for assigning the value to a variable:
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var varname = windowconfirm("Your Message");
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You would replace varname with a variable name that you wish to use You would then replace the Your Message text with the text you wish to have in the dialog box that pops up So, if you wanted to assign the result to a variable named is_sure and ask the question Are you sure you could use the following code:
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var is_sure = windowconfirm("Are you sure ");
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Figure 10-2 shows a sample confirm dialog box that is displayed by the preceding code Notice the two buttons the viewer can choose to click: OK and Cancel Depending on the browser, this may look slightly different If the viewer clicks OK, the method returns true If the user clicks Cancel, the method returns false The bad news is that you can t change the value of the text in the buttons You are stuck with OK and Cancel, at least while using the confirm method As a real example of this method, suppose that you want to create a link to another page, but you want to be sure the viewer wants to leave before being sent away You could use
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Figure 10-2 An example of a confirm dialog box
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the confirm dialog box to find out whether or not the viewer wishes to leave the page The following code shows how you can get a confirmation from the viewer and react appropriately First, the HTML code:
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<body> <a href="http://wwwgooglecom" id="search_link">Go Searching</a> </body>
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Next, use JavaScript to confirm whether the user really wants to leave when the link is clicked:
var s_link = documentgetElementById("search_link"); s_linkonclick = function() { var is_sure = windowconfirm("Are you sure you want to leave "); if (!is_sure) { windowalert("OK You can stay here"); return false; } };
The function confirms whether or not the viewer wants to leave
Notice that if OK is clicked and the confirm() method returns true, the viewer is taken to the linked Web site If cancel is clicked and the confirm() method returns false, an alert is sent to the viewer and the function returns false so that the link won t be followed by the browser (you can also simply omit the alert and just have nothing happen after Cancel is clicked, by using only the return false statement) Figure 10-3 shows the browser window after the link is clicked on the page The confirm dialog box with your Are you sure you want to leave message pops up on the screen
Figure 10-3 A confirm dialog box pops up when the button is clicked
10: Window Object
The find() Method
You can use the find() method to let the viewer find a certain bit of text on your page It tells the browser to use its built-in Find utility and enables the viewer to type in what to look for on the page For example, if you wanted to create a button for viewers to click when they want to find something on your page, you could use the following code:
<form> <input type="button" value="Click to Find Text" onclick="windowfind();" /> </form>
This pops up the Find dialog box in the browser and enables the viewer to search for text within the page Figure 10-4 shows the result of this script when it is added to an HTML document This functionality is useful if you have a really long page and want the viewer to be able to find things more quickly by searching the page
The home() Method
The home() method is used to send the viewer to the home page the viewer has set in the Web browser settings For instance, you could use it to offer viewers a button that will take them to their selected home page when clicked, as in the following code (at the time of this writing this method worked in Mozilla Firefox and Opera but did not work in Microsoft Internet Explorer):
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