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;
}
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 🙂
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]
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 $result;
}
Takayuki-San, domo arigato gozaimasu!
Hi Jeff, glad you understood. I also need this but I am still not sure if I understand.
Could you place the place the code (part of) you used with the variable and tag-names you used ? This may just help me enough to understand the application.
As an example, I have two dates and need to check if the start date is before the end date. If not issue a message.
Thanks,
I can’t thank you enough for making this plugin as flexible as it is while keeping the high-level aspects as simple as they are.
I’ve just created a custom verification/validation function that prevents free email providers to be used for the email field, and I thought I’d share. BTW, this is a fully working example, but you can repurpose/modify it to do anything else.
// Add custom validation for CF7 form fields
function is_company_email($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.<br />Please contact us directly if this isn\'t possible.';
}
}
return $result;
}
add_filter('wpcf7_validate_email','custom_email_validation_filter', 10, 2); // Email field
add_filter('wpcf7_validate_email*', 'custom_email_validation_filter', 10, 2); // Req. Email field
Thanks again, and I hope others might find this helpful.
Thanks, KZeni. I think this is a good example of custom validation.
Joacim
(@joacimjoacimnilssonse)
Can someone give me a step-to-step guide for this? Or is it impossible to understand if you’re not a good programmer?
– Thanks
Joacim
(@joacimjoacimnilssonse)
I have found this. Could i implement it somehow?
It’s for Swedish use
Thanks
function personnummer(nr){
this.valid=false;
if(!nr.match(/^(\d{2})(\d{2})(\d{2})\-(\d{4})$/)){ 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<this.alldigits.length;n++){ nn+=((((n+1)%2)+1)*this.alldigits.substring(n,n+1)); }
this.checksum=0;
for(var n=0;n<nn.length;n++){ this.checksum+=nn.substring(n,n+1)*1; }
this.valid=(this.checksum%10==0)?true:false;
this.sex=parseInt(this.controldigits.substring(2,3))%2;
}
</script>
<form onsubmit="if(new personnummer(this.pnr.value).valid){ alert('A valid social security number'); } else { alert('No valid social security number'); }; return false;">
Personnummer: <input type="text" name="pnr"> <input type="submit" value="Check">
</form>
