Title: [Plugin: Contact Form 7] Custom field validation code Last modified: August 20, 2016 --- # [Plugin: Contact Form 7] Custom field validation code * Resolved [fusionx22](https://wordpress.org/support/users/fusionx22/) * (@fusionx22) * [14 years, 11 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/) * Hello, * I have a client that needs some custom validation code added to their forms. * They require a specific ID number, and the number needs to be run through a LUHN algorithm (mod 10) to check for validity – similar to verifying a credit card number. * Is there any way to hook into the process and run a custom validation routine, or would I need to hack up the text.php file and add my own tag definitions, etc? I really don’t want to modify plug-in code. * Thanks in advance! * –jeff * [http://wordpress.org/extend/plugins/contact-form-7/](http://wordpress.org/extend/plugins/contact-form-7/) Viewing 11 replies - 1 through 11 (of 11 total) * Plugin Author [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/) * (@takayukister) * [14 years, 11 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2188716) * You don’t need t edit the text.php file directly, but looking into the function` wpcf7_text_validation_filter()` defined in the text.php would help you learn how you can customize validation in your own plugin or functions.php in your theme. * This is a sample code: * ``` add_filter( 'wpcf7_validate_text', 'your_validation_filter_func', 10, 2 ); add_filter( 'wpcf7_validate_text*', 'your_validation_filter_func', 10, 2 ); function your_validation_filter_func( $result, $tag ) { $type = $tag['type']; $name = $tag['name']; if ( 'your-id-number-field' == $name ) { $the_value = $_POST[$name]; if ( is_not_valid_against_your_validation( $the_value ) ) { $result['valid'] = false; $result['reason'][$name] = "Error message here"; } } return $result; } ``` * Thread Starter [fusionx22](https://wordpress.org/support/users/fusionx22/) * (@fusionx22) * [14 years, 11 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2188917) * Thank you very much for this. * The one thing that stumps me, is I would like this to work on more than one field on the site – there are several forms that require this validation. * this line: * `if ( 'your-id-number-field' == $name ) {` * makes me think I would need to define a new tag that is specific to my ID fields. Can that also be done in a new plug-in, to have it available in the Contact Form 7 plugin? I would think hacking the Contact Form 7 plug-in would be necessary. * It would be great if CF7 had user defined tags 🙂 * Plugin Author [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/) * (@takayukister) * [14 years, 11 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2188921) * Yes. Add this into your plugin: * `wpcf7_add_shortcode( 'yourid', 'wpcf7_text_shortcode_handler', true );` * Then, use a tag like this inside the form: * `[yourid your-id-number-field]` * Plugin Author [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/) * (@takayukister) * [14 years, 11 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2188923) * In above case, * ``` $type = $tag['type']; $name = $tag['name']; ``` * $tag[‘type’] has “yourid” and $tag[‘name’] has “your-id-number-field”. So, your_validation_filter_func() should be: * ``` function your_validation_filter_func( $result, $tag ) { $type = $tag['type']; $name = $tag['name']; if ( 'yourid' == $type ) { // <--- this line changed $the_value = $_POST[$name]; if ( is_not_valid_against_your_validation( $the_value ) ) { $result['valid'] = false; $result['reason'][$name] = "Error message here"; } } return $result; } ``` * Thread Starter [fusionx22](https://wordpress.org/support/users/fusionx22/) * (@fusionx22) * [14 years, 11 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2188925) * Takayuki-San, domo arigato gozaimasu! * [Karesansui](https://wordpress.org/support/users/karesansui/) * (@karesansui) * [14 years, 10 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2189047) * Hi Jeff, glad you understood. I also need this but I am still not sure if I understand. * Could you place the place the code (part of) you used with the variable and tag- names you used ? This may just help me enough to understand the application. * As an example, I have two dates and need to check if the start date is before the end date. If not issue a message. * Thanks, * [KZeni](https://wordpress.org/support/users/kzeni/) * (@kzeni) * [14 years, 7 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2189107) * I can’t thank you enough for making this plugin as flexible as it is while keeping the high-level aspects as simple as they are. * I’ve just created a custom verification/validation function that prevents free email providers to be used for the email field, and I thought I’d share. BTW, this is a fully working example, but you can repurpose/modify it to do anything else. * ``` // Add custom validation for CF7 form fields function is_company_email($email){ // Check against list of common public email providers & return true if the email provided *doesn't* match one of them if( preg_match('/@gmail.com/i', $email) || preg_match('/@hotmail.com/i', $email) || preg_match('/@live.com/i', $email) || preg_match('/@msn.com/i', $email) || preg_match('/@aol.com/i', $email) || preg_match('/@yahoo.com/i', $email) || preg_match('/@inbox.com/i', $email) || preg_match('/@gmx.com/i', $email) || preg_match('/@me.com/i', $email) ){ return false; // It's a publicly available email address }else{ return true; // It's probably a company email address } } function custom_email_validation_filter($result,$tag){ $type = $tag['type']; $name = $tag['name']; if($name == 'company-email'){ // Only apply to fields with the form field name of "company-email" $the_value = $_POST[$name]; if(!is_company_email($the_value)){ // Isn't a company email address (it matched the list of free email providers) $result['valid'] = false; $result['reason'][$name] = 'You need to provide an email address that isn\'t hosted by a free provider.
Please contact us directly if this isn\'t possible.'; } } return $result; } add_filter('wpcf7_validate_email','custom_email_validation_filter', 10, 2); // Email field add_filter('wpcf7_validate_email*', 'custom_email_validation_filter', 10, 2); // Req. Email field ``` * Thanks again, and I hope others might find this helpful. * Plugin Author [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/) * (@takayukister) * [14 years, 7 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2189108) * Thanks, KZeni. I think this is a good example of custom validation. * [Joacim](https://wordpress.org/support/users/joacimjoacimnilssonse/) * (@joacimjoacimnilssonse) * [14 years, 4 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2189127) * Can someone give me a step-to-step guide for this? Or is it impossible to understand if you’re not a good programmer? * – Thanks * [Joacim](https://wordpress.org/support/users/joacimjoacimnilssonse/) * (@joacimjoacimnilssonse) * [14 years, 4 months ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2189128) * I have found this. Could i implement it somehow? * It’s for Swedish use * Thanks * ``` function personnummer(nr){ this.valid=false; if(!nr.match(/^(\d{2})(\d{2})(\d{2})\-(\d{4})$/)){ return false; } this.now=new Date(); this.nowFullYear=this.now.getFullYear()+""; this.nowCentury=this.nowFullYear.substring(0,2); this.nowShortYear=this.nowFullYear.substring(2,4); this.year=RegExp.$1; this.month=RegExp.$2; this.day=RegExp.$3; this.controldigits=RegExp.$4; this.fullYear=(this.year*1<=this.nowShortYear*1)?(this.nowCentury+this.year)*1:((this.nowCentury*1-1)+this.year)*1; var months = new Array(31,28,31,30,31,30,31,31,30,31,30,31); if(this.fullYear%400==0||this.fullYear%4==0&&this.fullYear%100!=0){ months[1]=29; } if(this.month*1<1||this.month*1>12||this.day*1<1||this.day*1>months[this.month*1-1]){ return false; } this.alldigits=this.year+this.month+this.day+this.controldigits; var nn=""; for(var n=0;n
Personnummer:
``` * [Dnesscarkey](https://wordpress.org/support/users/dnesscarkey/) * (@dnesscarkey) * [14 years ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2189144) * This plugin will help to add more validation rules in contact form 7. [http://wordpress.org/extend/plugins/jquery-validation-for-contact-form-7/](http://wordpress.org/extend/plugins/jquery-validation-for-contact-form-7/) Viewing 11 replies - 1 through 11 (of 11 total) The topic ‘[Plugin: Contact Form 7] Custom field validation code’ is closed to new replies. * ![](https://ps.w.org/contact-form-7/assets/icon.svg?rev=2339255) * [Contact Form 7](https://wordpress.org/plugins/contact-form-7/) * [Frequently Asked Questions](https://wordpress.org/plugins/contact-form-7/#faq) * [Support Threads](https://wordpress.org/support/plugin/contact-form-7/) * [Active Topics](https://wordpress.org/support/plugin/contact-form-7/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/contact-form-7/unresolved/) * [Reviews](https://wordpress.org/support/plugin/contact-form-7/reviews/) * 11 replies * 6 participants * Last reply from: [Dnesscarkey](https://wordpress.org/support/users/dnesscarkey/) * Last activity: [14 years ago](https://wordpress.org/support/topic/plugin-contact-form-7-custom-field-validation-code/#post-2189144) * Status: resolved