From my Vancouver WordPress Meet-up talk about to do neat-o things with the Gravity Forms plugin.

1. GET MORE OUT OF
GRAVITY FORMS
VANCOUVER WORDPRESS MEET-UP – MAY 15, 2014

2. WHAT WE'LL COVER:
1. The challenge
2. Gravity Forms vs. ...
3. Get more out of the box
4. Get more with hooks
5. Some gotchas

3. THE CHALLENGE

4. MUST-HAVES
A form that would accept user-submitted nominations
and save them as a custom post type
A voting mechanism for each award category that only
allowed a person to vote once per person per category

5. SOLUTION?
Gravity Forms!

6. vs.
Single license: $39 Single license: $0 + ???
User analytics: $19
File uploads: $39
Front-end posting: $39
Multi-part forms: $39
Conditional logic: $29
TOTAL: $165

7. OUT OF THE BOX MAGIC

8. FORM FIELDS IN A SNAP

9. USER-SUBMITTED POSTS

10. BUT WHAT ABOUT CPTS?
There's a plugin for that.

11. NEEDED TO TURN THIS...

12. INTO THIS:

13. GRAVITY FORMS +
CUSTOM POST TYPES
Find it WP plugin directory:
wordpress.org/plugins/gravity-forms-custom-post-types/
Better yet, get it from Github*:
github.com/bradvin/gravity-forms-custom-post-types
*No PHP error notices with WP DEBUG on.

14. FORMS IN MODALS
(or another modal plugin) will allow you to easily
show or or hide your form on demand.
Fancybox

15. IN A THEME FILE
hostedwith ❤by
<div id="voting‐form" style="display:none">
<?php echo do_shortcode( '[gravityform id="6" title="false" description="false" ajax="true"]' ) ?>
</div>
<a href="#voting‐form" class="fancybox button">Vote Now</a>
viewrawGravityFormsandFancybox GitHub
Initially hidden form + Ajax submitting= no-fuss modal perfection!

16. IN THE WILD

17. IN THE WILD

18. GET MORE WITH HOOKS
Around 200 actions & filters you can use to extend GF...
www.gravityhelp.com/documentation/page/Developer_Docs

19. WHERE DOES IT GO?
1. Your theme's functions.php file
2. A functionality plugin

20. AUTO-POPULATE FIELDS
Many ways to go about this!
gform_field_value_[your custom param]
gform_pre_render_[your form ID]

21. gform_field_value_[your custom param]
Use this filter for text fields or pre-selection of options in a dropdown, etc. See the offcial docs .here
hostedwith ❤by
function my_city_population_function( $value ){
return 'Vancouver';
}
add_filter( 'gform_field_value_my_city', 'my_city_population_function' );
viewrawDynamicallyPopulateGravityFormsTextField GitHub

22. gform_field_value_[your custom param]

23. gform_pre_render_[your form ID]
Use this filter to pre-populate choices in a dropdown, etc. See the offcial docs .here
Check out a sample Gist.

24. CUSTOM VALIDATION
Be the boss of your form AND database!
gform_validation_[your form ID]

25. gform_validation_[your form ID]
hostedwith ❤by
function my_custom_validation( $validation_result ) {
$form = $validation_result["form"];
// Sorry, you don't get to live in Vancouver...
if ( $_POST['input_1'] == 'Vancouver' ) {
$validation_result["is_valid"] = false;
foreach ( $form["fields"] as &$field ) {
// NOTE: Replace 1 with the field you would like to validate
if ( $field["id"] == "1" ) {
$field["failed_validation"] = true;
$field["validation_message"] = "Sorry, you can't enter Vancouver here!";
break;
}
}
}
// Assign modified $form object back to the validation result
$validation_result["form"] = $form;
return $validation_result;
}
add_filter( 'gform_validation_[your form ID]', 'my_custom_validation' );
viewrawGravityFormsCustomValidationExample GitHub
See the offcial docs .here

26. RESTRICT UPLOAD SIZE
There's no way to do this out of the box and you may not
want users uploading 32MB files!
There is a plugin for that, but it's buggy. Instead...
Check out this Gist.

27. CUSTOM CHECK FOR
DUPLICATES
Preventing duplicates is easy... preventing a single user from
submitting the same field value twice is harder.
Check out this Gist.

28. SOME GOTCHAS
Duplicate prevention (use )
Ajax and captcha
And on the topic of spam...
this plugin

29. THAT'S ALL FOLKS!
Find me: and@mandiwise mandiwise.com
All of the snippets: gist.github.com/mandiwise