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[_a-z0-9-]+ means that our email address can have _ (underscore), alphabets from a to z, numerical from 0 to 9 and a (hyphen) for 1 or more time (\.[_a-z0-9-]+)* means the email address can have a . (period) followed by _ (underscore), alphanumerical, - (hyphen) for 0 or more times @[a-z0-9-]+ means the email address must have @ symbol followed by alphanumerical and - (hyphen) for 1 or more times (\.[a-z]{2,3})$ means the email address must terminate with a . (period) and any alphabet from a to z which should be between 2 to 3 (in count) i.e. after the .(period) we cannot have less than 2 alphabet or more than 3 alphabet
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So if we enter the email address that does not match with the regular expression supplied above, we will get the error: Invalid email address as shown in Figure 8-9:
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Figure 8-9. Error message displayed if invalid email address is entered Now if we enter a valid email address that follows the regular expression specified in the server side script file, validatemail.php, then it will be accepted without displaying any error message as shown in Figure 8-10:
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Figure 8-10. Email address accepted and no error message displayed if it is valid So in our HTML we have two input text fields assigned class names userid and emailadd respectively for the purpose of accessing them via jQuery code. After each of these input text fields, we have an empty span element that will be used for displaying error messages. The span element is to display the error message in case an invalid user id is entered; in which case the span element is assigned the class usrerror and the span element intended for displaying our error message related to invalid email addresses, is assigned the class name: emailadd. The text to these span elements will be assigned from the response generated by the server side script. In the style sheet file, we give the class selector label a float property set to value left so that the next item (the input text field) may appear to its right, and its width property is set to value 120px to give enough space for the label to display. The class selector userid has width property set to value 200 px to define the size of the input text field for entering userid. Similarly, the class selector emailadd has width property set to value 200 px to define the size of the input text field for entering email address. The class selectors usrerror and emerror have color property set to red to highlight them, padding from left is set to 10px to keep the distance from their respective input text field. Finally, the class selector submit has margin-left and margin-top property set to 125px and 10px respectively, to set the distance
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CHAPTER 8 AJAX
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from the left boundary of the browser window and from the input text field, because we want the submit button to appear below the input text fields. In the jQuery code itself, we begin by hiding the span element of class usrerror and emerror at the beginning. We will display them when some invalid data is entered. We then attach a click event to the submit button that is assigned the id submit. We next retrieve the user id and email address entered by the user in the input text field (of class userid and emailadd respectively), and store them in variables uid and em. To send these to the server, we define a variable data that will store a string userid=uid&emailadd=em where uid and em hold the userid and email address entered by the user. This data variable is sent to the server to be assigned to the script file validatedata.php (which is assumed to already exist on the server) for validating our userid and email address. We next invoke the request through the ajax() method, where we specify that the method of request that we are going to use is POST and the name of the script file that will be executed on the server is validatedata.php. Meanwhile the parameter to be passed to the script file is contained in the string data, which contains the string userid=uid&emailadd=em). The script file (validatedata.php on server), after it has processed the passed data generates the output which is received by the JavaScript file in the parameter html of the callback function. The response returned by the script file (stored in html) is split wherever line feed character ( \n ) has occurred (assuming that the two error message generated by the script file are separated by \n ) and the result is stored in variable twomsgs. Our variable twomsgs is an array of two elements, containing the error message related to userid and the email address itself. We then split each element of the twomsgs array (containing data in format: field|error_message ) one by one wherever | has occurred, and store the result in another array errmsg. The result is that the first element of the errmsg array contains either user or email and the errmsg[1] contains the respective error message. If the errmsg [0] contains the string user , then we assign the contents of errmsg [0] (which contains the error message of userid) to the span element of class usrerror for displaying the error message to the user. The span element of class usrerror is made visible first before assigning the error message If the errmsg [0] contains the string email , then we assign the contents of errmsg [1] (which contains the error message of email address) to the span element of class emerror for displaying the error message to the user. The span element of class emerror is made visible first before assigning the error message. We return false in the click event to suppress the default browser click behavior, because we want it to take action that is specified via our jQuery code and not the default click default action In the PHP code, we access the userid and email address sent by the Java Script file via parameter data containing the information in the format userid=uid&emailadd=em through the $_POST array (since the data is sent via the HTTP POST request) and store them in variables: $name and $emid respectively. Then with the help of the eregi() method, the regular expressions for both userid and the email address are specified as we ve seen above. If the userid does not match the specified regular expression meaning the userid is invalid then we display the text user|Invalid User id by assigning it to our $errors variable. The contents after the symbol | are designed to be displayed as an error message in the span element that exists after the input text fields. If the userid is valid (that is, it matches with our regular expression), then the text user| is assigned to our $errors variable. Thus, no error message is supplied after the |symbol, and so no error message will be displayed for a valid userid just as we wish. The same thing is then repeated with the email address: if it is invalid, then the text email|Invalid email address is concatenated to the $errors variable. So, if we enter invalid userid and email address (one that does not match with the regular expressions supplied in the server side script file), we will get the errors shown in Figure 8-11:
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