Stacking multiple categories with dynamic parameters

#1 / Oct 31, 2011 6:17am

kachunchau

14 posts

I’m trying to filter multiple categories using dynamic parameters but looking at this archive thread http://ellislab.com/forums/viewthread/105576/#531808 it doesn’t seen possible.

Does anyone have a solution for this?

And here’s the code I’ve been using.

{exp:channel:entries channel="products" dynamic_parameters="category"}

<div class="product">
<h2>{title}</h2>
<p>{product_description}<br />
<ul><br />
<li>{product_price}</li><br />
<li>{product_lift_height}</li><br />
<li>{product_fuel}</li><br />
<li>{product_transmission}</li><br />
<li>{product_doors}</li><br />
<li>{product_year}M</li><br />
<li>{product_capacity}</li><br />
</ul><br />
</div></p>

<p>{/exp:channel:entries}</p>

<p><form method="post" action="{path='site/index'}"><br />
    <select name="category"><br />
 <option value="">-- Manufacturer --</option><br />
        {exp:child_categories parent="3" child_categories_sort_direction="asc" show_empty="yes"}<br />
 {child_category_start}<br />
 <option value="{child_category_id}">{child_category_name}</option><br />
 {child_category_end}<br />
 {/exp:child_categories}<br />
    </select><br />
    <br />
    <select name="category"><br />
 <option value="">-- Model --</option><br />
        {exp:child_categories parent="2" child_categories_sort_direction="asc" show_empty="yes"}<br />
 {child_category_start}<br />
 <option value="{child_category_id}">{child_category_name}</option><br />
 {child_category_end}<br />
 {/exp:child_categories}<br />
    </select><br />
    <input type="submit" value="Go!" /><br />
</form></p>

<p><br />
</body><br />
</html>

Thanks,
Ka-Chun

#2 / Oct 31, 2011 11:28am

Kevin Cupp
791 posts

Hi Ka-Chun,

I think this post (http://ellislab.com/forums/viewthread/105576/#626053) is probably the best solution at the moment. You just set your PHP parsing mode to Input and then build the categories parameter string yourself from the $_POST data. Sorry there’s nothing better available at the moment, this is one of those special cases.

Kevin
#3 / Oct 31, 2011 11:39am

kachunchau
14 posts

Strangely that solution wasn’t working for me earlier but it’s working for me now. Thanks Kevin! By the way does this work with more than 2 categories?
#4 / Oct 31, 2011 11:47am

Kevin Cupp
791 posts

Glad to hear it’s working. Yes the category parameter should work with as many categories as you need.

Kevin

#5 / Oct 31, 2011 12:18pm

kachunchau

14 posts

I’m getting a php error on the default page when I’m not filtering the entries, is there a way to fix this? Sorry for asking this but I’m not good with PHP.

The code I’m using:

<?php
if (isset($_POST)){
    $cats = ' category="';
    $cats .= $_POST['manufacturer'] . "&" . $_POST['model'];
    $cats .= '" ';
}
else{
 $cats="";
}
?> 

<form method="post" action="{path='site'}">

    <select name="manufacturer">
 <option value="">-- Manufacturer --</option>
        {exp:child_categories parent="3" child_categories_sort_direction="asc" show_empty="yes"}
 {child_category_start}
 <option value="{child_category_id}">{child_category_name}</option>
 {child_category_end}
 {/exp:child_categories}
    </select>
    
    <select name="model">
 <option value="">-- Model --</option>
        {exp:child_categories parent="14" child_categories_sort_direction="asc" show_empty="yes"}
 {child_category_start}
 <option value="{child_category_id}">{child_category_name}</option>
 {child_category_end}
 {/exp:child_categories}
    </select>

    <input type="submit" value="Go!" />

</form>

{exp:channel:entries channel="products" dynamic="off" <?php echo $cats; ?>}

<div class="product">
<h2>{title}</h2>
<p>{product_description}<br />
<ul><br />
<li>{product_price}</li><br />
<li>{product_lift_height}</li><br />
<li>{product_fuel}</li><br />
<li>{product_transmission}</li><br />
<li>{product_doors}</li><br />
<li>{product_year}M</li><br />
<li>{product_capacity}</li><br />
</ul><br />
</div></p>

<p>{/exp:channel:entries}

Thanks,
Ka-Chun

Edit: The error is an ‘Undefined index: manufacturer’ and for the model as well.

#6 / Oct 31, 2011 1:19pm
Kevin Cupp
791 posts
To access POST data in templates now-a-days, I think you need to do this:
```
$EE =& get_instance();
$manufacturer = $EE->input->post('manufacturer');
$model = $EE->input->post('model');
```
Let me know how that works.

#7 / Oct 31, 2011 1:40pm

kachunchau

14 posts

Is this what you’re suppose to do?

<?php
$EE =& get_instance();
$manufacturer = $EE->input->post('manufacturer');
$model = $EE->input->post('model');

if (isset($_POST)){
    $cats = ' category="';
    $cats .= $_POST['manufacturer'] . "&" . $_POST['model'];
    $cats .= '" ';
}
else{
 $cats="";
}
?>

Sorry I’m not really helping with these PHP problems :red:

#8 / Oct 31, 2011 1:42pm
Kevin Cupp
791 posts
That’s alright, I should have mentioned to replace your $_POST variables with the new ones you assigned at the top. So, this part of the code:
```
$cats .= $_POST['manufacturer'] . "&" . $_POST['model'];
```
...should look like this:
```
$cats .= $manufacturer . "&" . $model;
```
Give that a try.
#9 / Oct 31, 2011 1:45pm

kachunchau
14 posts

That did the job, thanks Kevin!

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