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<span class="error"> Please select the country</span></div> <input class="submit" type="submit" value="Submit"> </form> </body> </html> The style sheet file to apply style properties to the HTML elements may appear as shown here: style.css .label {float: left; width: 120px; } .infobox {width: 120px; } .error { color: red; padding-left: 10px; } .submit { margin-left: 125px; margin-top: 10px;} div{padding: 5px; } .chkb { margin-left: 125px; margin-top: 10px;} .radiobtn { margin-left: 125px; margin-top: 10px;} The jQuery code to validate all of the fields is shown here: $(document).ready(function() { $('.error').hide(); $('.fooderror').addClass('error'); $('.fooderror').hide(); $('.payerror').addClass('error'); $('.payerror').hide(); $('.submit').click(function(event){ var data=$('.userid').val(); if(validate_userid(data)) { $('.userid').next().hide(); } else { $('.userid').next().show(); } data=$('.password').val(); var len=data.length; if(len<1) { $('.password').next().show(); } else { $('.password').next().hide(); }
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data=$('.emailadd').val(); if(valid_email(data)) { $('.emailadd').next().hide(); } else { $('.emailadd').next().show(); } var count=0; $('div').find(':checkbox').each(function(){ if($(this).is(':checked')) { count++; } }); if(count==0) { $('.fooderror').css({'margin-left':250}).show(); } else { $('.fooderror').hide(); } count=0; $('div').find(':radio').each(function(){ if($(this).is(':checked')) { count++; } }); if(count==0) { $('.payerror').css({'margin-left':250}).show(); } else { $('.payerror').hide(); } count=$('select option:selected').val(); if(count==0) { $('.infobox').next().show(); }
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else { $('.infobox').next().hide(); } event.preventDefault(); }); }); function valid_email(email) { var pattern= new RegExp(/^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]+$/); return pattern.test(email); } function validate_userid(uid) { var pattern= new RegExp(/^[a-z0-9_]+$/); return pattern.test(uid); }
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The meaning of the jQuery code statements is as follows, line by line: 2. Hides all the errors related to userid, password, email address, and country. All these error messages are nested inside the span element of the class error. 3-4. Applies the style properties contained in the class selector error to the error message related to the checkboxes displaying different food items. The style properties in class selector error apply the red color to the error message. The error message is made hidden for the time being. 5-6. Applies the style properties of the class selector error to the error related to the radio buttons displaying different modes of payment (it will appear in red). The error message is made invisible at the beginning. 7. Attaches the click event to the Submit button. 8. Retrieves the data entered in the User Id field (text-input field of class userid) and stores it in the variable data. 9-16. Validates the user ID in the data variable by passing it to the validate_userid() function to compare it with the regular expression that tests to see that the user ID consists only of characters , numerals, or underscores and nothing else. If the user ID matches with the regular expression supplied, no error message will be displayed; otherwise, the error message (which is the element next to the text-input field) User id can contain only numeral, character, or _ (underscore) will be displayed on the screen.
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17-26. Retrieves the data entered in the Password field (text-input field of the class password) and stores it in the variable data. We find out the length of the contents in the data variable. If the length is less than 1 that is, if the Password field is left empty then the error message (which is the element next to the text-input field) Password cannot be blank will be displayed on the screen; otherwise, the error message is kept in hidden mode. 27-35. Retrieves the data entered in the email address field (text-input field of the class emailadd) and stores it in the variable data. Then we validate the email address in the data variable by passing it to the validate_email() function to compare it with the regular expression that tests to see that the email address begins with an alphanumeric character and contains a period and an @ symbol. If the email address matches with the regular expression supplied, no error message will be displayed; otherwise, the error message (which is the element next to the text-input field) Invalid email address will be displayed on the screen. 36-42. Initializes a variable count to 0. Finds out all the checkboxes in the div element that are checked by making use of the .each() function. The value of the variable count is incremented by 1 on finding any checked checkbox. In other words, we are counting the number of checked checkboxes. 43-50. If the value in the count variable is 0, meaning no checkbox is selected, the error message defined by the span element of the class fooderror will be displayed and the margin-left property will be applied to it with a value of 250px using the .css() method to make it appear at the distance of 250px from the left border of the browser window (below other error messages, if any). If the value in the count variable is not zero, the error message is kept in hidden mode. 51-57. Initializes a variable count to 0. Finds out all the radio buttons in the div element that are checked (selected) by making use of the .each() function. The value of the variable count is incremented by 1 on finding any checked radio button. 58-65. If the value in the count variable is 0, meaning no radio button is selected, the error message defined by the span element of the class payerror will be displayed and the margin-left property will be applied to it with the value 250px using the .css() method to make it appear at the distance of 250px from the left border of the browser window (below other error messages, if any). If the value in the count variable is not zero, the error message is kept in hidden mode. 66-74. Finds the number of options that are selected in the select element. The count of the selected options is stored in the variable count. If the value in the count variable is 0 that is, if no option is selected from the select element then an error message (which is the element next to the select element of the class infobox) Please select the country will be displayed on the screen; otherwise, the error message is kept in hidden mode. 75. Invokes the preventDefault() method of the event object to prevent the data entered or selected by the user from being sent to the server, as we are only interested here in validation of data.
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