Setting an If Statement with AJAX in PHP - php

Question

I am nearing completion of this code / plugin and I just have one bit to finish up before we make it all pretty and presentable; I am attempting to get my PHP file to re-load/re-fresh with the POST variables sent from the AJAX file, all from the response of the AJAX send:
$("#CategoryTree").load("poster.php #CategoryTree");
Right now on clicking a list item the CSS fires, the ajax fires and responds, variables are sent (checked them in the action registry as well all good there) but the area I call to re-load with the poster.php #CategoryTree does not react, error 500 is thrown.
Here is my full Javascript code:
jQuery(document).ready(function($) {
$('#CategoryTree').on('click', 'input[type=checkbox]', function() {
var $this = $(this);
var data = '';
if ($this.is(":checked")) {
$this.addClass('selectCheckbox');
//$this.val("1");
data = {
action: 'catID_Callback',
catID: $this.attr('id'),
catState: 1
};
$.post(the_ajax_script.ajaxurl, data, function(response) {
//alert('Got this from the server: ' + response);
$("#CategoryTree").load("poster.php #CategoryTree");
//alert( "Load was performed." );});
console.log(response);
});
} else {
$this.removeClass('selectCheckbox');
//$this.val("0");
data = {
action: 'catID_Callback',
catID: $this.attr('id'),
catState: 0
};
$.post(the_ajax_script.ajaxurl, data, function(response) {
// alert('Got this from the server: ' + response);
console.log(response);
});
}
});
});
And here is the PHP code (Line 55 is where the check starts):
<?php
//$message = "Started";
//echo "<script type='text/javascript'>alert('$message');</script>";
$thearray = [];
$terms = get_terms("pa_mymelp");
foreach ( $terms as $term ) {
$categories = $term->name;
array_push($thearray, $categories);
}
$categoryLines = $thearray;
function buildCategoryTree($categoryLines, $separator) {
$catTree = array();
foreach ($categoryLines as $catLine) {
$path = explode($separator, $catLine);
$node = & $catTree;
foreach ($path as $cat) {
$cat = trim($cat);
if (!isset($node[$cat])) {
$node[$cat] = array();
}
$node = & $node[$cat];
}
}
return $catTree;
}
function displayCategoryTree($categoryTree, $indent = '') {
foreach ($categoryTree as $node => $children) {
echo $indent . $node . "\n";
displayCategoryTree($children, $indent . '|- ');
}
}
$categoryTree = buildCategoryTree($categoryLines, '/');
function displayHtmlCategoryTree($categoryTree, $id = null, $pathSeparator = '/', $parents = '') {
if (empty($categoryTree)) return '';
$str = '<ul' . (!empty($id) ? ' id="'.$id.'"' : '') . '>';
foreach ($categoryTree as $node => $children) {
$currentPath = $parents . (empty($parents) ? '' : $pathSeparator) . $node;
$thelink = '';
$opener = 0;
if (substr_count($currentPath, '/')==5){
$patterns = array(" ", "/", ".");
$thelink = 'http://caap.co.nz/?pa_mymelp=' . strtolower(str_replace($patterns, '-', $currentPath));
$str .= '<li title="' . $currentPath . '">' . '<input value ="0" class="first" type="checkbox" id="' . $currentPath . '">' . '<label for="' . $currentPath . '">' . '' . $node . '</label>' .
/*displayHtmlCategoryTree($children, null, $pathSeparator, $currentPath) .
*/'</li>';}
else
{
$cat = 0;
$catState = 0;
if (isset($_POST['catID'])){
$cat = $_POST['catID'];
}
if (isset($_POST['catState'])){
$catState = $_POST['catState'];
}
$str .= '<li title="' . $currentPath . '">' . '<input value="0" class="first" type="checkbox" id="' . $currentPath . '">' . '<label for="' . $currentPath . '">' . $node . '</label>';
if ($cat == $currentPath && $catState == 1 ){$str.=displayHtmlCategoryTree($children, null, $pathSeparator, $currentPath);}
}
}
$str .= '</li></ul>';
return $str;
}
echo displayHtmlCategoryTree($categoryTree, "CategoryTree", '/');
/*
function add_query_vars_filter( $vars ){
foreach (array_keys(Contracts::$query_params) as $name)
$vars[] = $name;
return $vars;
}
add_filter( 'query_vars', 'add_query_vars_filter' );
*/
?>
Here is the pertinent code from the PHP file
$cat = 0;
$catState = 0;
if (isset($_POST['catID'])){
$cat = $_POST['catID'];
}
if (isset($_POST['catState'])){
$catState = $_POST['catState'];
}
$str .= '<li title="' . $currentPath . '">' . '<input value="0" class="first" type="checkbox" id="' . $currentPath . '">' . '<label for="' . $currentPath . '">' . $node . '</label>';
if ($cat == $currentPath && $catState == 1 ){$str.=displayHtmlCategoryTree($children, null, $pathSeparator, $currentPath);}

Answer 1

Remove semicolon after if curly braces. if{}; to if{}
if (isset($_POST['catID'])){$cat = $_POST['catID'];};
replace it to
if (isset($_POST['catID'])){
$cat = $_POST['catID'];
}
Now your code looks like.
if (isset($_POST['catID'])){
$cat = $_POST['catID'];
}
if (isset($_POST['catState'])){
$catState = $_POST['catState'];
}
$str .= '<li title="' . $currentPath . '">' . '<input value="0" class="first" type="checkbox" id="' . $currentPath . '">' . '<label for="' . $currentPath . '">' . $node . '</label>';
if ($cat == $currentPath && $catState == 1){
$str.=displayHtmlCategoryTree($children, null, $pathSeparator, $currentPath);
}