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2. Add a statement that selects the first input and attaches the focus event to it. This ensures that when the page loads, the first input has focus applied to it:
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$( input:first ).focus();
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Figure 8-1: The focus is applied to the rst input element after the page is loaded in Firefox
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DISABLING AND ENABLING FORM ELEMENTS
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Disabling and enabling form elements is required in areas of a Web site where you don t want to allow your users to change a field, as shown in Figure 8-2. One scenario that calls for
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CHAPTER 8: CREATING ADVANCED FORMS WITH JQUERY
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disabling form elements is a multi-part form. On the first page, say that you collect information such as username, password, and e-mail address. On the second page, you collect billing addresses and payment information and confirm the information that is passed over from the first page, but as disabled form fields: 1. Set up the HTML form input element that you wish to disable after the page has loaded.
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<input type= text id= name-input />
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2. Add a statement that selects the name-input element and sets the disabled attribute or false using the attr() method:
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$( #name-input ).attr( disabled , false );
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If you would like to enable the input field, just change the parameters that you pass into the attr method from disabled to enabled or true.
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Figure 8-2: The disabled form after the disabled attribute has been applied
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HIGHLIGHTING CURRENT FIELDS IN FORMS
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In larger forms, you can help users keep track of where they are by highlighting which field they are currently on. Most browsers have built-in events that highlight the current field, such as the Firefox example in Figure 8-3. You can set up a secondary highlight using CSS and the jQuery focus event. By adding a custom highlight, you can ensure that users know how far along they are in any given form. Using CSS, you can add a highlight as shown on the contact form example from Wufoo (www.wufoo.com) in Figure 8-4.
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PART III: APPLYING JQUERY TO YOUR WEB SITE
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A highlighted form eld
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Figure 8-3: An example of Firefox s native feature for highlighting a form eld
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Figure 8-4: Add a highlight as shown on the contact form example from Wufoo
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CHAPTER 8: CREATING ADVANCED FORMS WITH JQUERY
In the following example, you use the focus and blur events to highlight different fields as the user clicks or tabs into them. The final working result is shown in Figure 8-5.
Figure 8-5: The highlight script in action in Firefox
1. Set up the HTML form input element, which you wish to highlight after the page has loaded:
<input type= text id= email-input />
2. Add CSS to control how the highlight will look. In this case, it has a yellow background with 5 pixels of padding:
.highlight {background:yellow;padding:5px;}
3. Select all input elements and attach a focus event. Inside the event handler function, add a statement that selects the element that was focused into and add a class called highlight. When the input has focus (the user has clicked or tabbed into that field), a highlight class is applied to the input field.
$( input ).bind( focus , function(){ $(this).addClass( highlight ); });
4. Select all input elements and attach a blur event. Inside the event handler function, add a statement that selects this element and removes the class highlight. When the input has blue (the user has moved out of that field), a highlight class is removed from the input field.
PART III: APPLYING JQUERY TO YOUR WEB SITE
$( input ).bind( blur , function(){ $(this).removeClass( highlight ); });
CREATING DEFAULT TEXT WITHIN INPUT FIELDS
Setting default text on form fields helps to instruct users on what needs to be entered into the fields. Many Web designers use the default text as form input labels to help save space or change up the design of the forms. You can set a default value using the value attribute, but the problem is that if a user clicks into the field, they need to delete what is currently there. In Figure 8-6, the Laithwaites Wine Web site (www.laithwaiteswine.com) has a simple implementation of this: their e-mail newsletter signup field at the bottom left corner of the Web page.
Figure 8-6: The Laithwaites Wine Web site has a simple implementation of default text in an input eld