{"id":9831,"date":"2024-01-12T18:09:00","date_gmt":"2024-01-12T18:09:00","guid":{"rendered":"https:\/\/codehim.com\/?p=9831"},"modified":"2024-01-22T16:12:41","modified_gmt":"2024-01-22T11:12:41","slug":"javascript-prevent-form-submit-until-validation","status":"publish","type":"post","link":"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/","title":{"rendered":"JavaScript Prevent Form Submit Until Validation"},"content":{"rendered":"

This JavaScript code helps you to create a functionality to prevent form submit until validation is complete. It adds the \"novalidate\"<\/code> attribute to the form, ensuring that HTML5 native validation is bypassed. The code then validates each form field on blur, displaying relevant error messages and styling.<\/p>\n

On form submission, it checks all fields for errors, preventing submission if any are found and focusing on the first erroneous field. This ensures user-entered data meets specified criteria for name, email, URL, and radio buttons.<\/p>\n

You can integrate this code to enhance your form’s user experience and data accuracy.<\/p>\n

How to Create Functionality in JavaScript to Prevent Form Submit Until Validation<\/h2>\n

1. First, copy and paste the following HTML code into your web page. This code includes a simple form with fields for name, email, URL, and radio buttons. Ensure your form has the class \"validate\"<\/code> for the JavaScript code to target.<\/p>\n

<form class=\"validate\" action=\"#\">\r\n\t<div>\r\n\t\t<label for=\"text\">Name<\/label>\r\n\t\t<input type=\"text\" id=\"text\" required>\r\n\t<\/div>\r\n\r\n\t<div>\r\n\t\t<label for=\"email\">Email<\/label>\r\n\t\t<input type=\"email\" id=\"email\" title=\"The domain portion of the email address is invalid (the portion after the @).\" pattern=\"^([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x22([^\\x0d\\x22\\x5c\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x22)(\\x2e([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x22([^\\x0d\\x22\\x5c\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x22))*\\x40([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x5b([^\\x0d\\x5b-\\x5d\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x5d)(\\x2e([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x5b([^\\x0d\\x5b-\\x5d\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x5d))*(\\.\\w{2,})+$\" required>\r\n\t<\/div>\r\n\r\n\t<div>\r\n\t\t<label for=\"url\">URL<\/label>\r\n\t\t<input type=\"url\" id=\"url\" title=\"The URL is a missing a TLD (for example, .com).\" pattern=\"^(?:(?:https?|HTTPS?|ftp|FTP):\\\/\\\/)(?:\\S+(?::\\S*)?@)?(?:(?!(?:10|127)(?:\\.\\d{1,3}){3})(?!(?:169\\.254|192\\.168)(?:\\.\\d{1,3}){2})(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-zA-Z\\u00a1-\\uffff0-9]-*)*[a-zA-Z\\u00a1-\\uffff0-9]+)(?:\\.(?:[a-zA-Z\\u00a1-\\uffff0-9]-*)*[a-zA-Z\\u00a1-\\uffff0-9]+)*(?:\\.(?:[a-zA-Z\\u00a1-\\uffff]{2,}))\\.?)(?::\\d{2,5})?(?:[\/?#]\\S*)?$\" required>\r\n\t<\/div>\r\n\r\n\t<div>\r\n\t\t<strong>Radio Buttons<\/strong>\r\n\t\t<label class=\"label-normal\">\r\n\t\t    <input type=\"radio\" name=\"radio\" id=\"radio-1\" required>\r\n\t\t    Yes\r\n\t\t<\/label>\r\n\t\t<label class=\"label-normal\">\r\n\t\t    <input type=\"radio\" name=\"radio\" id=\"radio-2\" required>\r\n\t\t    No\r\n\t\t<\/label>\r\n\t<\/div>\r\n\r\n\t<input type=\"submit\" class=\"button\" value=\"Submit\">\r\n<\/form>\r\n<\/pre>\n
2. Copy the following CSS code into your stylesheet. These styles ensure a visually appealing and user-friendly form. You can customize the styles according to your website’s design.<\/p>\n
body {\r\n\tfont-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", \"Roboto\", \"Oxygen\", \"Ubuntu\", \"Cantarell\", \"Fira Sans\", \"Droid Sans\", \"Helvetica Neue\", sans-serif;\r\n\tfont-size: 112.5%;\r\n}  \r\n\r\n\/**\r\n * Form Styles\r\n *\/\r\n\r\nform{\r\n   background: #fff;\r\n   padding: 12px;\r\n}\r\nlabel {\r\n\tdisplay: block;\r\n\tfont-weight: bold;\r\n\tmargin-bottom: 0.5em;\r\n}\r\n\r\n.label-normal {\r\n\tfont-weight: normal;\r\n}\r\n\r\n.description-date {\r\n\tcolor: #808080;\r\n\tfont-size: 0.8em;\r\n\tfont-weight: normal;\r\n}\r\n\r\n.supports-date .description-date {\r\n    display: none;\r\n}\r\n\r\ninput,\r\nselect {\r\n\tdisplay: inline-block;\r\n\tfont-size: 1em;\r\n\tmargin-bottom: 1em;\r\n\tpadding: 0.25em 0.5em;\r\n\twidth: 100%;\r\n     box-sizing: border-box;\r\n}\r\n\r\n[type=\"checkbox\"],\r\n[type=\"radio\"] {\r\n\tmargin-bottom: 0.5em;\r\n\twidth: auto;\r\n}\r\n\r\n.button {\r\n\tbackground-color: #0088cc;\r\n\tborder: 1px solid #0088cc;\r\n\tborder-radius: 1px;\r\n\tcolor: #ffffff;\r\n\tdisplay: inline-block;\r\n\tfont-size: 0.9375em;\r\n\tfont-weight: normal;\r\n\tline-height: 1.2;\r\n\tmargin-right: 0.3125em;\r\n\tmargin-bottom: 0.3125em;\r\n\tpadding: 0.5em 0.6875em;\r\n\twidth: auto;\r\n}\r\n\r\n.button:active,\r\n.button:focus,\r\n.button:hover {\r\n\tbackground-color: #005580;\r\n\tborder-color: #005580;\r\n\tcolor: #ffffff;\r\n\ttext-decoration: none;\r\n}\r\n\r\n.button:active {\r\n\tbox-shadow: inset 0 0.15625em 0.25em rgba(0, 0, 0, 0.15), 0 1px 0.15625em rgba(0, 0, 0, 0.05);\r\n}\r\n\r\n\/**\r\n * Errors\r\n *\/\r\n.error {\r\n\tborder-color: red;\r\n}\r\n\r\n.error-message {\r\n\tcolor: red;\r\n\tfont-style: italic;\r\n\tmargin-bottom: 1em;\r\n}<\/pre>\n
3. Finally, copy and paste the JavaScript code at the end of your HTML file or include it in a separate script file. This code adds the “novalidate” attribute to your form, disabling native HTML5 validation. It then implements custom validation logic for each field, showing error messages on blur and preventing form submission if errors exist.<\/p>\n
\/\/ Add the novalidate attribute when the JS loads\r\nvar forms = document.querySelectorAll('.validate');\r\nfor (var i = 0; i < forms.length; i++) {\r\n    forms[i].setAttribute('novalidate', true);\r\n}\r\n\r\n\r\n\/\/ Validate the field\r\nvar hasError = function (field) {\r\n\r\n    \/\/ Don't validate submits, buttons, file and reset inputs, and disabled fields\r\n    if (field.disabled || field.type === 'file' || field.type === 'reset' || field.type === 'submit' || field.type === 'button') return;\r\n\r\n    \/\/ Get validity\r\n    var validity = field.validity;\r\n\r\n    \/\/ If valid, return null\r\n    if (validity.valid) return;\r\n\r\n    \/\/ If field is required and empty\r\n    if (validity.valueMissing) return 'Please fill out this field.';\r\n\r\n    \/\/ If not the right type\r\n    if (validity.typeMismatch) {\r\n\r\n        \/\/ Email\r\n        if (field.type === 'email') return 'Please enter an email address.';\r\n\r\n        \/\/ URL\r\n        if (field.type === 'url') return 'Please enter a URL.';\r\n\r\n    }\r\n\r\n    \/\/ If too short\r\n    if (validity.tooShort) return 'Please lengthen this text to ' + field.getAttribute('minLength') + ' characters or more. You are currently using ' + field.value.length + ' characters.';\r\n\r\n    \/\/ If too long\r\n    if (validity.tooLong) return 'Please shorten this text to no more than ' + field.getAttribute('maxLength') + ' characters. You are currently using ' + field.value.length + ' characters.';\r\n\r\n    \/\/ If number input isn't a number\r\n    if (validity.badInput) return 'Please enter a number.';\r\n\r\n    \/\/ If a number value doesn't match the step interval\r\n    if (validity.stepMismatch) return 'Please select a valid value.';\r\n\r\n    \/\/ If a number field is over the max\r\n    if (validity.rangeOverflow) return 'Please select a value that is no more than ' + field.getAttribute('max') + '.';\r\n\r\n    \/\/ If a number field is below the min\r\n    if (validity.rangeUnderflow) return 'Please select a value that is no less than ' + field.getAttribute('min') + '.';\r\n  \r\n      \/\/ If pattern doesn't match\r\n    if (validity.patternMismatch) {\r\n\r\n        \/\/ If pattern info is included, return custom error\r\n        if (field.hasAttribute('title')) return field.getAttribute('title');\r\n\r\n        \/\/ Otherwise, generic error\r\n        return 'Please match the requested format.';\r\n\r\n    }\r\n\r\n    \/\/ If all else fails, return a generic catchall error\r\n    return 'The value you entered for this field is invalid.';\r\n\r\n};\r\n\r\n\r\n\/\/ Show an error message\r\nvar showError = function (field, error) {\r\n\r\n    \/\/ Add error class to field\r\n    field.classList.add('error');\r\n  \r\n    \/\/ If the field is a radio button and part of a group, error all and get the last item in the group\r\n    if (field.type === 'radio' && field.name) {\r\n        var group = document.getElementsByName(field.name);\r\n        if (group.length > 0) {\r\n            for (var i = 0; i < group.length; i++) {\r\n                \/\/ Only check fields in current form\r\n                if (group[i].form !== field.form) continue;\r\n                group[i].classList.add('error');\r\n            }\r\n            field = group[group.length - 1];\r\n        }\r\n    }\r\n\r\n    \/\/ Get field id or name\r\n    var id = field.id || field.name;\r\n    if (!id) return;\r\n\r\n    \/\/ Check if error message field already exists\r\n    \/\/ If not, create one\r\n    var message = field.form.querySelector('.error-message#error-for-' + id );\r\n    if (!message) {\r\n        message = document.createElement('div');\r\n        message.className = 'error-message';\r\n        message.id = 'error-for-' + id;\r\n        \r\n        \/\/ If the field is a radio button or checkbox, insert error after the label\r\n        var label;\r\n        if (field.type === 'radio' || field.type ==='checkbox') {\r\n            label = field.form.querySelector('label[for=\"' + id + '\"]') || field.parentNode;\r\n            if (label) {\r\n                label.parentNode.insertBefore( message, label.nextSibling );\r\n            }\r\n        }\r\n\r\n        \/\/ Otherwise, insert it after the field\r\n        if (!label) {\r\n            field.parentNode.insertBefore( message, field.nextSibling );\r\n        }\r\n\r\n    }\r\n    \r\n    \/\/ Add ARIA role to the field\r\n    field.setAttribute('aria-describedby', 'error-for-' + id);\r\n\r\n    \/\/ Update error message\r\n    message.innerHTML = error;\r\n\r\n    \/\/ Show error message\r\n    message.style.display = 'block';\r\n    message.style.visibility = 'visible';\r\n\r\n};\r\n\r\n\r\n\/\/ Remove the error message\r\nvar removeError = function (field) {\r\n\r\n    \/\/ Remove error class to field\r\n    field.classList.remove('error');\r\n    \r\n    \/\/ Remove ARIA role from the field\r\n    field.removeAttribute('aria-describedby');\r\n\r\n    \/\/ If the field is a radio button and part of a group, remove error from all and get the last item in the group\r\n    if (field.type === 'radio' && field.name) {\r\n        var group = document.getElementsByName(field.name);\r\n        if (group.length > 0) {\r\n            for (var i = 0; i < group.length; i++) {\r\n                \/\/ Only check fields in current form\r\n                if (group[i].form !== field.form) continue;\r\n                group[i].classList.remove('error');\r\n            }\r\n            field = group[group.length - 1];\r\n        }\r\n    }\r\n\r\n    \/\/ Get field id or name\r\n    var id = field.id || field.name;\r\n    if (!id) return;\r\n    \r\n\r\n    \/\/ Check if an error message is in the DOM\r\n    var message = field.form.querySelector('.error-message#error-for-' + id + '');\r\n    if (!message) return;\r\n\r\n    \/\/ If so, hide it\r\n    message.innerHTML = '';\r\n    message.style.display = 'none';\r\n    message.style.visibility = 'hidden';\r\n\r\n};\r\n\r\n\r\n\/\/ Listen to all blur events\r\ndocument.addEventListener('blur', function (event) {\r\n\r\n    \/\/ Only run if the field is in a form to be validated\r\n    if (!event.target.form.classList.contains('validate')) return;\r\n\r\n    \/\/ Validate the field\r\n    var error = hasError(event.target);\r\n  \r\n    \/\/ If there's an error, show it\r\n    if (error) {\r\n        showError(event.target, error);\r\n        return;\r\n    }\r\n\r\n    \/\/ Otherwise, remove any existing error message\r\n    removeError(event.target);\r\n\r\n}, true);\r\n\r\n\r\n\/\/ Check all fields on submit\r\ndocument.addEventListener('submit', function (event) {\r\n\r\n    \/\/ Only run on forms flagged for validation\r\n    if (!event.target.classList.contains('validate')) return;\r\n\r\n    \/\/ Get all of the form elements\r\n    var fields = event.target.elements;\r\n\r\n    \/\/ Validate each field\r\n    \/\/ Store the first field with an error to a variable so we can bring it into focus later\r\n    var error, hasErrors;\r\n    for (var i = 0; i < fields.length; i++) {\r\n        error = hasError(fields[i]);\r\n        if (error) {\r\n            showError(fields[i], error);\r\n            if (!hasErrors) {\r\n                hasErrors = fields[i];\r\n            }\r\n        }\r\n    }\r\n\r\n    \/\/ If there are errrors, don't submit form and focus on first element with error\r\n    if (hasErrors) {\r\n        event.preventDefault();\r\n        hasErrors.focus();\r\n    }\r\n\r\n    \/\/ Otherwise, let the form submit normally\r\n    \/\/ You could also bolt in an Ajax form submit process here\r\n\r\n}, false);<\/pre>\n
If needed, customize the validation rules in the JavaScript code to match your specific requirements. You can adjust the error messages, validation patterns, and field-specific criteria based on your application’s needs.<\/p>\n
That’s all! hopefully, you have successfully created a functionality in JavaScript to prevent form submit until validation process. If you have any questions or suggestions, feel free to comment below.<\/p>\n","protected":false},"excerpt":{"rendered":"
This JavaScript code helps you to create a functionality to prevent form submit until validation is complete. It adds the…<\/p>\n","protected":false},"author":1,"featured_media":9837,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[232],"tags":[],"class_list":["post-9831","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-forms"],"acf":[],"yoast_head":"\nJavaScript Prevent Form Submit Until Validation — CodeHim<\/title>\n<meta name=\"description\" content=\"Here is a free code snippet to create a JavaScript Prevent Form Submit Until Validation. 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You can view demo and download the source code.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/\" \/>\n<meta property=\"og:site_name\" content=\"CodeHim\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/codehimofficial\" \/>\n<meta property=\"article:published_time\" content=\"2024-01-12T18:09:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-01-22T11:12:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/codehim.com\/wp-content\/uploads\/2023\/11\/JavaScript-Prevent-Form-Submit-Until-Validation.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"960\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Asif Mughal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@CodeHimOfficial\" \/>\n<meta name=\"twitter:site\" content=\"@CodeHimOfficial\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Asif Mughal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/\"},\"author\":{\"name\":\"Asif Mughal\",\"@id\":\"https:\/\/codehim.com\/#\/schema\/person\/cc48f1dbe072a89a62a98171b7db43ed\"},\"headline\":\"JavaScript Prevent Form Submit Until Validation\",\"datePublished\":\"2024-01-12T18:09:00+00:00\",\"dateModified\":\"2024-01-22T11:12:41+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/\"},\"wordCount\":301,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/codehim.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/codehim.com\/wp-content\/uploads\/2023\/11\/JavaScript-Prevent-Form-Submit-Until-Validation.png\",\"articleSection\":[\"Forms\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/\",\"url\":\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/\",\"name\":\"JavaScript Prevent Form Submit Until Validation — CodeHim\",\"isPartOf\":{\"@id\":\"https:\/\/codehim.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/codehim.com\/forms\/javascript-prevent-form-submit-until-validation\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/codehim.com\/wp-content\/uploads\/2023\/11\/JavaScript-Prevent-Form-Submit-Until-Validation.png\",\"datePublished\":\"2024-01-12T18:09:00+00:00\",\"dateModified\":\"2024-01-22T11:12:41+00:00\",\"description\":\"Here is a free code snippet to create a JavaScript Prevent Form Submit Until Validation. 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