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Other Popular Regular Expressions for Form Validation
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Example
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(/^[0-9-+]+$/) (/^\d{1,2}\/\d{1,2}\/\d{4}$/) (^[0-9]+$) (^[A-Za-z]+$)
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COPYING THE CONTENTS OF ONE FIELD INTO ANOTHER
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If you have ever purchased something online, you probably had to fill out a form by entering your billing address and shipping address. For most consumers, this information is the same, so such forms often have a Same As Billing Address check box that says same as billing that copies over all the form fields from billing to shipping, preventing the customer from needing to re-enter all of that information. This check box uses a copy field functionality. Not only does it save the customer time, but also reduces the likelihood of them mis-entering data. Figure 8-14 shows an example of a copy field check box on the checkout page of Best Buy s Web site (www.bestbuy.com). The following script shows how to set up a copy field check box, which can be added to any form. It doesn t have to be a billing/shipping form, as it is in the following example. The working script is shown in Figure 8-15. 1. Start off by creating a two sets of address input fields. The first set contains the billing address and the second set contains the shipping address. Add an input check box before the fields to control the copying of the fields from the billing to shipping.
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CHAPTER 8: CREATING ADVANCED FORMS WITH JQUERY
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<label>Copy Fields</label> <input type= checkbox id= copy-fields /> <div id= billing-address > <h2>Billing Address</h2> <label>First Name</label> <input type= text id= b-first-name /> <label>Last Name</label> <input type= text id= b-last-name /> </div> <div id= shipping-address > <h2>Shipping Address</h2> <label>First Name</label> <input type= text id= s-first-name /> <label>First Name</label> <input type= text id= s-last-name /> </div>
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Figure 8-14: An example of a copy eld check box on the checkout page of the Best Buy Web site
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PART III: APPLYING JQUERY TO YOUR WEB SITE
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2. Select the #copy-fields input element and attach a click event to it.
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$( #copy-fields ).bind( click , function(){ });
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3. Add a variable for each field that you would like to copy over. Each variable stores the value for a field located within the billing address.
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$( #copy-fields ).bind( click , function(){ var billFName = $( #b-first-name ).val(); var billLName = $( #b-last-name ).val(); });
4. Create an if else statement to test whether the copy fields element is checked before performing any actions within the click event.
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$( #copy-fields ).bind( click , function(){ var billFName = $( #b-first-name ).val(); var billLName = $( #b-last-name ).val(); if (this.checked) { } else { }; });
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5. If the copy-fields element is checked, set the values of the corresponding shipping fields equal to their counterparts in the billing fields.
$( #copy-fields ).bind( click , function(){
var billFName = $( #b-first-name ).val(); var billLName = $( #b-last-name ).val(); if (this.checked) { $( #s-first-name ).val(billFName); $( #s-last-name ).val(billLName); } else { }; });
6. You need to set up an alternative option within the else statement that clears all the shipping input fields when the copy fields input is unchecked.
$( #copy-fields ).bind( click , function(){ var billFName = $( #b-first-name ).val(); var billLName = $( #b-last-name ).val(); if (this.checked) { $( #s-first-name ).val(billFName); $( #s-last-name ).val(billLName); } else { $( .shipping-address input ).val( ); }; });
CHAPTER 8: CREATING ADVANCED FORMS WITH JQUERY
The Copy Fields check box
Figure 8-15: The Copy Fields check box in action
ENHANCING FORMS WITH PLUG-INS
Incorporating third-party or open source plug-ins into your Web site or application allows you to code faster and offer better form validation or even interaction. Due to the large community of followers and supporters who work with jQuery, a very wide range of plug-ins exists. You can find plug-ins that do anything from setting default text on a field to validating every field on your form. I use plug-ins when creating something myself is not an option due to a limited timeframe. In most cases, if someone has already done a good job of creating a plug-in, I find it unnecessary to try to write my own anyway. In this section, I review two plug-ins that I frequently use with forms: qTip and Validate.