Canceling Default Behavior <\/title> <script> function checkform() { document.getElementById(\"form1\").onsubmit = function() { var allowSubmit = true; if( document.getElementById(\"user\").value == \"\") { alert(\" Name field cannot be blank \"); allowSubmit = false; } if(allowSubmit) alert(\" Data OK - submitting form \"); return allowSubmit; } } window.onload = checkform; <script> <\/head> <body> <form id =\"form1\"> Name: <input type =\"text\" value =\"\" name =\" username\" id =\" user\"\/> [Required field] <br\/> Phone: <input type =\" text\" value =\"\" name =\"telephone\" id =\"phone\"\/> [Optional field] <br\/> <input type =\" submit\"\/> <\/form> <\/body> <\/html><\/p>", "transcribed_text": "", "related_book": { "title": "Case Studies In Business Data Bases", "isbn": "0030141346, 978-0030141348", "edition": "1st Edition", "authors": "James Bradley", "cover_image": "https:\/\/dsd5zvtm8ll6.cloudfront.net\/si.question.images\/book_images\/6509613e726c7_55546.jpg", "uri": "\/textbooks\/case-studies-in-business-data-bases-1st-edition-9780030141348", "see_more_uri": "\/textbooks\/computer-science-azure-2416" }, "question_posted": "2024-09-10 02:13:49", "step_by_step_answer": "The Answer is in the image, click to view ...", "students_also_viewed": [ { "url": "\/tyler-service-co-experienced-the-following-transactions-for-2014-its", "description": "Tyler Service Co. experienced the following transactions for 2014, its first year of operations: 1. 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Modify the code of Listing 9.1 to also validate that the phone field of the form is not blank. Have the program produce only one alert message, saying which field(s) require attention.<\/p>

Canceling Default Behavior <\/title> <script> function checkform() { document.getElementById(\"form1\").onsubmit = function() { var allowSubmit = true; if( document.getElementById(\"user\").value == \"\") { alert(\" Name field cannot be blank \"); allowSubmit = false; } if(allowSubmit) alert(\" Data OK - submitting form \"); return allowSubmit; } } window.onload = checkform; <script> <\/head> <body> <form id =\"form1\"> Name: <input type =\"text\" value =\"\" name =\" username\" id =\" user\"\/> [Required field] <br\/> Phone: <input type =\" text\" value =\"\" name =\"telephone\" id =\"phone\"\/> [Optional field] <br\/> <input type =\" submit\"\/> <\/form> <\/body> <\/html><\/p>", "transcribed_text": "", "related_book": { "title": "Case Studies In Business Data Bases", "isbn": "0030141346, 978-0030141348", "edition": "1st Edition", "authors": "James Bradley", "cover_image": "https:\/\/dsd5zvtm8ll6.cloudfront.net\/si.question.images\/book_images\/6509613e726c7_55546.jpg", "uri": "\/textbooks\/case-studies-in-business-data-bases-1st-edition-9780030141348", "see_more_uri": "\/textbooks\/computer-science-azure-2416" }, "question_posted": "2024-09-10 02:13:49", "step_by_step_answer": "The Answer is in the image, click to view ...", "students_also_viewed": [ { "url": "\/tyler-service-co-experienced-the-following-transactions-for-2014-its", "description": "Tyler Service Co. experienced the following transactions for 2014, its first year of operations: 1. 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