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case=ucfirst | upper | lower | lcfirst
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exclude_regex= [character set]
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name,exclude_ regex=[^a-z ] The name field value must be composed of the characters a to z or the period No other characters are allowed
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The only characters that are allowed to be the value of the named form field Everything else is excluded An error message is generated when the value contains excluded characters
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Continued
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Part III Running Web Applications
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Table 12-1 (Continued)
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Parameter pattern=none Example email,pattern= email The e-mail pattern specifies that the value of the named field (email) is checked for a valid e-mail address Explanation The pattern parameter specifies a special pattern to be considered for the named form field If the field value does not correspond to the specified pattern, it is rejected and an error message is generated Supported patterns are: none, email, us_zipcode, and large_plain_ text You can add a new patternchecking subroutine called sub check_newpattern { # your checking code } to the script to support new patterns for other types of form fields valid_data= value1|value2 opt-in,valid_ data=yes|no Here the opt-in field can only have a value of yes or no This parameter is used for text fields that can only have one of the specified values, which are separated by a | character
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After the form field information is loaded in @fieldInfo array, the next code segment, as shown below, checks whether the configuration file has a template directory (that is, value for $templateDir variable), or whether the @fieldInfo array is empty
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if ($templateDir eq || $#fieldInfo < 1 ) { print $query->header; print alert( Sorry, $formName is not managed by this script ); exit 0; }
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These tests are done to determine whether the current form is configured in the formwizardini file If it is not configured, the script returns an error message stating that the named form is not managed by the script and terminates the program If the Web form is configured properly in formwizardini file, then the script continues to the next code segment:
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my @errors = validate_data(\@fieldInfo); if ($#errors >= 0) { print $query->header; print alert(join( \\n ,@errors) \\n\\n
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$cfg->val($formName, data_error_msg )); exit 0; }
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Here the script calls the validate_data() subroutine, which is passed the @fieldInfo array reference to verify that the entered user data has no errors This subroutine does the following: 1 It loops through each form field specific information found in the @fieldInfo array (which is passed to the subroutine as a reference) and retrieves the field name, field type, field requirements, and so on 2 For each form field it retrieves the value from the $query object using the $query->param($fieldname) method The value is stored in $value variable 3 If the field is required and the value is empty, an error message is stored in the @errors array, and the loop continues with the next field If the field is optional and the user has entered no value, the loop continues to the next field 4 When there is a value (for a required or an optional field), the check_data_field() subroutine is called to verify that the value meets the field requirements stated in the configuration file 5 If the field value passes the validation checks performed by the check_data_ field() subroutine, the case of the value is changed per configuration requirements In other words, the value is either uppercased, lowercased, or mixed case and stored in the CGI object using the $query->param() method The check_data_field() routine returns a list of errors (if any) 6 If errors are returned by the check_data_field() subroutine, the script displays an error message using the alert() subroutine and aborts On the other hand, if there is no error to report, the script continues to write data to disk using the write_data() subroutine The write_data() uses the data filename from the configuration file The fully qualified data file path is based on the configuration parameters data_directory and data_filename This routine writes user-entered, case-modified data in the order given in the data_field_order configuration parameter using the field separator named in data_field_separator parameter Note that the data file is opened for append mode only and that it is exclusively locked during the write operation so that no other copies of formwizardpl have access to it during this critical period 7 Then the script uses the thankyou_redirect_url configuration option found in formwizardini to determine whether the user should be redirected to another URL or a thank you message should be displayed to the user If the thankyou_redirect_url is not empty in the configuration file, the script uses the redirect_data() subroutine to redirect the user to the named URL The redirect_data() subroutine packs all the form fields as key=value pairs in the URL and redirects the user s Web browser to the URL For example, if the registerhtml is filled out with name=mohammed kabir, zipcode=95833, email=MRKABIR@hotmailcom, and opt-in=yes, and if the thankyou_ redirect_url is set to http://wwwdomaincom/friendspl, then the redirect_data() subroutine redirects the Web browser to:
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