Set max length for editor

• rshmiraf

• July 14, 2016 at 9:50 pm

Hi,
I would like to limit my field in wordpress dashboard. Something like max-length=”100″ for max 100 chars. Is it possible?

• James

• July 15, 2016 at 2:20 pm

Hi @rshmiraf

Could you please tell me which field type is it? I believe the text and text area already have the option to do it. For the other field, I think you can use the acf/validate_value filter instead. This page should give you more idea about it: https://www.advancedcustomfields.com/resources/acf-validate_value/.

I hope this helps 🙂

• rshmiraf

• July 15, 2016 at 4:13 pm

Hi James,
I tried this but without result. This field is wysiwyg editor end text field. Could you share me example with code / option which limit word character for example 40 chars.

• James

• July 17, 2016 at 2:08 pm

Hi @rshmiraf

For WYSIWYG field, I believe you can do it like this:

add_filter('acf/validate_value/name=wysiwyg_field_name', 'my_acf_validate_value', 10, 4);

function my_acf_validate_value( $valid, $value, $field, $input ){
    
    // bail early if value is already invalid
    if( !$valid ) {
        
        return $valid;
        
    }
    
    if( strlen($value) > 40 ) {
        
        $valid = 'You can\'t enter more that 40 chars';
        
    }
    
    
    // return
    return $valid;
    
    
}

If still no joy, could you please share the code you have?

Thanks 🙂

• mike

• July 10, 2018 at 7:46 pm

Hi,

This code works, but it counts the number of total HTML characters in the field, not the rendered number of characters (what the user sees in the visual editor).

For example, if you type the text « Hello World », it will count 11 characters. But if you put this same text in bold, it will count 28 characters, because the content of the field is actually : <strong>Hello World</strong>.

So a better solution would be to strip the tags from the value variable before counting the number of characters, like so :

add_filter('acf/validate_value/name=wysiwyg_field_name', 'my_acf_validate_value', 10, 4);

function my_acf_validate_value( $valid, $value, $field, $input ){
    
    // bail early if value is already invalid
    if( !$valid ) {
        
        return $valid;
        
    }
    
    if( strlen(strip_tags($value)) > 40 ) {
        
        $valid = 'You can\'t enter more that 40 chars';
        
    }
    
    
    // return
    return $valid;
    
    
}