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As above. I want to change the WordPress Edtior TinyMCE behavior when I click the underline button I want the TinyMCE to wrap my selection with <u></u> tags. Now, I know that the u tag was deprecated in HTML 4~ but according to W3 it can be used in HTML5 again. Anyways! I need a <u> tag - not a <span>.

Is there a way to change the default underline button behavior without any shortcodes or editing core files? Something like a hook to change the editor behavior in functions.php would be nice :) Thanks!

  • Check this question and answers. – Max Yudin May 3 '16 at 8:27
  • Unfortunately, this solutions doesn't work. Tried turning the inline function into standalone one but still nothing, wraps with span. – pbe May 3 '16 at 8:52
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After few days I got it to work. Gotta check those core files, now I know how. Anyways, here is the working code:

function my_tiny_mce_tweaks( $first_init ) {
  $first_init['formats'] = '{' .
      'alignleft: [' .
          '{selector: "p,h1,h2,h3,h4,h5,h6,td,th,div,ul,ol,li", styles: {textAlign:"left"}},' .
          '{selector: "img,table,dl.wp-caption", classes: "alignleft"}' .
      '],' .
      'aligncenter: [' .
          '{selector: "p,h1,h2,h3,h4,h5,h6,td,th,div,ul,ol,li", styles: {textAlign:"center"}},' .
          '{selector: "img,table,dl.wp-caption", classes: "aligncenter"}' .
      '],' .
      'alignright: [' .
          '{selector: "p,h1,h2,h3,h4,h5,h6,td,th,div,ul,ol,li", styles: {textAlign:"right"}},' .
          '{selector: "img,table,dl.wp-caption", classes: "alignright"}' .
      '],' .
      'strikethrough: {inline: "del"},' .
      'underline: {inline: "u"}' .
  '}';

  return $first_init;
}
add_filter('tiny_mce_before_init', 'my_tiny_mce_tweaks');

Just add it to functions.php and you good to go. It will be probably easier if you remove the dots . and join the string. Hope it helps!

  • +1 but I assume you could have just change the value of $first_init['underline'] instead of redoing all values. it might cause problems if there are more then one plugin hooking on that filter – Mark Kaplun May 4 '16 at 14:01
  • It probably won't work. With the code above I'm changing the array part and 'underline' is a part of the string in that array part. Would be better to just change the underline part but without ex. RegEx it's not possible. – pbe May 4 '16 at 15:30
  • Oh you are right – Mark Kaplun May 4 '16 at 15:44
  • 1
    json_decode() to parse the JSON, edit the array, then json_encode() the result. – Ast Derek Feb 23 '17 at 2:37
  • Great idea @AstDerek but I get NULL from decoding that string... Any ideas why? I think that because for ex. alignleft isn't wrapped with "alignleft" quotation marks. Might be wrong tho. – pbe Feb 25 '17 at 12:00

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