This thread is resolved. Here is a description of the problem and solution.
Problem:
With a hierarchical taxonomy of States > Cities the client wants to be able to display the top level as a list, click one term to choose it, display the next level of the hierarchy in a list (including post counts), then click on a term to display the posts themselves.
Solution:
- Create a taxonomy View to display only the top-level terms by including a taxonomy parent filter to "Select taxonomy terms whose parent is None."
- In the Loop Output section link to a page where a second View will be added and add a URL parameter to pass the chosen State, like so:
<wpv-loop> <h3><a href="http://mysite.com/cities-of-chosen-state/?state=[wpv-taxonomy-id]">[wpv-taxonomy-title]</a> ([wpv-taxonomy-post-count])</h3> </wpv-loop>
- Now create a second taxonomy View to display the Cities for the chosen State set by the URL parameter. Add a parent taxonomy Query Filter.
For taxonomy Views it is not possible to set the value using a URL parameter, so set a fixed value for the time being. We'll overwrite this with a snippet of code.
In the Loop Output section link to the taxonomy archive for the city (and include the post count), like so:
<wpv-loop> <h3>[wpv-taxonomy-link] ([wpv-taxonomy-post-count])</h3> </wpv-loop
This View will be added to the page which is linked to from the first View. For this second View you must add the attribute cached="off" to ensure the filters are triggered.
We then need to add a snippet of PHP (to the theme's functions.php, or using a plugin such as Code Snippets) to modify the term value in the second View, like so:
/**
* Modify tax query
*/
function custom_modify_tax_query( $tax_query_settings, $view_settings, $view_id ){
if ( 9 == $view_id && isset($_GET['state']) ) { \\ Edit View ID
$tax_query_settings['child_of'] = $_GET['state'];
}
return $tax_query_settings;
}
add_filter( 'wpv_filter_taxonomy_query', 'custom_modify_tax_query', 101, 3 );
This is the technical support forum for Toolset - a suite of plugins for developing WordPress sites without writing PHP.
Everyone can read this forum, but only Toolset clients can post in it. Toolset support works 6 days per week, 19 hours per day.
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|
| - | 7:00 – 14:00 | 7:00 – 14:00 | 7:00 – 14:00 | 7:00 – 14:00 | 7:00 – 14:00 | - |
| - | 15:00 – 16:00 | 15:00 – 16:00 | 15:00 – 16:00 | 15:00 – 16:00 | 15:00 – 16:00 | - |
Supporter timezone: Europe/London (GMT+00:00)
This topic contains 5 replies, has 2 voices.
Last updated by 6 years, 11 months ago.
Assisted by: Nigel.
OK, the wpv_filter_taxonomy_query filter wasn't being triggered because I need caching turned off for the View.
So, I couldn't think how you would do this with your set up how it is without resorting to writing custom queries, namely how you have a separate taxonomy for state and for city.
So I combined these into a single hierarchical Location taxonomy, with the top level the states, and the child terms the cities, as shown in the location-taxomomy screenshot.
I have a taxonomy View which lists just the States, which it does by adding a taxonomy parent filter to "Select taxonomy terms whose parent is None."
In the Loop Output section I link to a page which will display the Cities, and which passes the taxonomy term ID (of the State) as a URL parameter to that page.
The key part looks like this:
<wpv-loop>
<h3><a href="<em><u>hidden link</u></em>">[wpv-taxonomy-title]</a> ([wpv-taxonomy-post-count])</h3>
</wpv-loop>
So I then create a second taxonomy View to show the cities which I add to a page "Cities of chosen state".
I again add a parent taxonomy Query Filter.
Taxonomy Views don't have the option to pass a value for the filter by URL parameter, so here I have to "hard-code" a State which I will then update with a little PHP. In my case I said the parent term was Florida.
My Loop Output section simply links to the taxonomy archive for the city (and includes the post count), like so:
<wpv-loop>
<h3>[wpv-taxonomy-link] ([wpv-taxonomy-post-count])</h3>
</wpv-loop>
Now we need to fix the actual parent so that it is the State passed as a URL parameter from the previous page.
So I needed to add the following to my functions.php file:
/**
* Modify tax query
*/
function custom_modify_tax_query( $tax_query_settings, $view_settings, $view_id ){
if ( 9 == $view_id && isset($_GET['state']) ) {
$tax_query_settings['child_of'] = $_GET['state'];
}
return $tax_query_settings;
}
add_filter( 'wpv_filter_taxonomy_query', 'custom_modify_tax_query', 101, 3 );
You will need to edit this for the correct View ID.
And, note that because the View uses a static choice for the parent State (e.g. Florida) and doesn't know we are changing it according to the URL parameter then the wpv_filter_taxonomy_query won't reliably be triggered. Where you insert this second View on the page you need to add the attribute cached="off".
Let me know how you get on.
