You should use the styleselect
key in the array of the TinyMCE settings for custom formats. This select is really useful for custom styles, enhancements. you find all relevant information for this solution in this answer to question #128931 in the same context.
Via fontselect
But if you like to use the font select, then use the follow source as example. The result is, that the editor add a span-tag with the font settings in inline styles, like <span style="font-family: arial, helvetica, sans-serif;">Content</span>
.
The follow example source create this result, visible in the screenshot.
Add Font Select
At first add the the key string to get the button to font select.
/**
* Add the "font family" button.
*/
add_filter( 'mce_buttons_2', 'fb_mce_editor_buttons' );
function fb_mce_editor_buttons( $buttons ) {
array_unshift( $buttons, 'fontselect' );
return $buttons;
}
Change Font List
Now you should see the default list of all fonts. The documentation have also include the list of the default value, font list. To change this list use the follow example.
/**
* Add fonts to the "Font Family" drop-down.
*/
add_filter( 'tiny_mce_before_init', 'fb_mce_before_init' );
function fb_mce_before_init( $settings ) {
$font_formats="Andale Mono=andale mono,times;"
. 'Arial=arial,helvetica,sans-serif';
$settings[ 'font_formats' ] = $font_formats;
return $settings;
}
Default Fonts
'Andale Mono=andale mono,times;'+ 'Arial=arial,helvetica,sans-serif;'+ 'Arial Black=arial black,avant garde;'+ 'Book Antiqua=book antiqua,palatino;'+ 'Comic Sans MS=comic sans ms,sans-serif;'+ 'Courier New=courier new,courier;'+ 'Georgia=georgia,palatino;'+ 'Helvetica=helvetica;'+ 'Impact=impact,chicago;'+ 'Symbol=symbol;'+ 'Tahoma=tahoma,arial,helvetica,sans-serif;'+ 'Terminal=terminal,monaco;'+ 'Times New Roman=times new roman,times;'+ 'Trebuchet MS=trebuchet ms,geneva;'+ 'Verdana=verdana,geneva;'+ 'Webdings=webdings;'+ 'Wingdings=wingdings,zapf dingbats'
TinyMCE 3 vs 4
Small hint, this works only since TinyMCE 4*, smaller this version you must use the key theme_advanced_fonts
instead of font_formats
.
Use Google Fonts
This answer shoulds help.