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Initially we hide the error messages (elements nested inside the span element of the class error). Thereafter, we check if the blur() event has occurred on the text-input field of class userid; that is, whether the focus is lost on the User Id field. If yes, we retrieve the data entered by the user in that field and store it in variable data. If the length of the contents in the variable data is found to be less than 1 that is, if the User Id field is left blank we make the element next to the User Id field (which is the span element of the class error) appear on the screen; we display the error message User id cannot be blank on the screen. Beside this, we also use the following two statements: $('.password').attr('disabled',true); $('.confpass').attr('disabled',true); to disable the Password and Confirm Passwords fields (two input fields of the classes password and confpass); that is, until and unless the user enters the User ID, both of the fields will be disabled. When
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the user enters some data in the User Id field, both of the disabled fields will be enabled with the following two statements: $('.password').removeAttr('disabled'); $('.confpass').removeAttr('disabled'); Similarly, we check if the Password field is left empty. If yes, again we see the error message Password cannot be blank and the Confirm Password field will be disabled until the user enters some data in the Password field. Finally, we check if the data entered in the Password and Confirm Password fields (data in elements of the.password and .confpass classes) are exactly same. If the two don t match, we display the error message (which is the element next to the Confirm Password field) Password and Confirm Password don t match. On execution of the jQuery code, if we leave the User Id field blank and lose focus from it, we get the error message User id cannot be blank, as shown in Figure 4-38. Also, the rest of the fields will be disabled; the user will not be able to enter anything in them until the user enters something in the User Id field:
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Figure 4-38. If a user ID is not provided, an error message appears and the remaining fields are disabled. If the Password field is left blank and we lose focus on it, we get the error message Password cannot be blank on the screen and also the Confirm Password field will be disabled until something is entered in the Password field, as shown in Figure 4-39.
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Figure 4-39. An error message appers and the Confirm Password field is disabled if a password is not entered.
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4-15. Validating a Complete Form
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You have a form where the user is supposed to provide a lot of information, including user ID, password, and email address. The user also is supposed to select the food items he want to purchase and select the
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mode of payment (specify the credit card) and designate in which country he lives. You want each field to be validated as follows: The user ID should consist of only characters, numerals, and underscores. The password cannot be left blank. The email address must contain a period and the @ symbol. At least one check box (food item) must be selected. The user must select one of the modes of payment. The country in which user lives must be selected.
Solution
Let s make an HTML file that displays labels and fields, as shown in Figure 4-40. We can see that there are six labels, three text-input fields, four checkboxes, three radio buttons, and one select element. The HTML code may appear as shown here: <body> <form> <div> <span class="label">User Id </span><input type="text" class="userid" name="userid" /><span class="error">User id can contain only numeral, character or _(underscore)</span></div> <div><span class="label">Password </span><input type="password" class="password" name="password" /><span class="error"> Password cannot be blank</span></div> <div><span class="label">Email Address </span><input type="text" class="emailadd" name="emailid" /><span class="error"> Invalid email address</span></div> <div><span class="label">Select Food items</span><br><input type="checkbox" id="pizza" name="pizza" value=5 class="chkb">Pizza $5 <br> <input type="checkbox" id="hotdog" name="hotdog" value=2 class="chkb">HotDog $2<br> <input type="checkbox" id="coke" name="coke" value=1 class="chkb">Coke $1<br> <input type="checkbox" id="fries" name="fries" value=3 class="chkb">French Fries $3<br> <span class="fooderror">You have not selected any food item</span></div> <div><span class="label">Mode of Payment</span><br><input type="radio" name="paymode" class="radiobtn" value="MasterCard">MasterCard <br> <input type="radio" name="paymode" class="radiobtn" value="ANZ Grindlay Card">ANZ Grindlay Card<br> <input type="radio" name="paymode" class="radiobtn" value="Visa Card">Visa Card<br> <span class="payerror">You have not selected any payment method</span></div> <div><span class="label">Country</span><select id="country" class="infobox"> <option value="0">Select a Country</option> <option value="USA">USA</option> <option value="United Kingdom">United Kingdom</option> <option value="India">India</option> <option value="China">China</option> </select>
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