I searched many topics on this site about my problem. Many of them helped me but I still have a major problem I can not solve.
I get Data via php file from a Sql DB. This php File converts the data into a json-string. Now I want to have this json String inside an js-File to build a Hyperbolic Tree out of this Data.
The problem is about this:
I have a php:
<?php
$categories = Category::getTopCategories();
$categories = array_values($categories);
echo json_encode($categories)
class Category
{
/**
* The information stored in the database for each category
*/
public $id;
public $parent;
public $name;
// The child categories
public $children;
public function __construct()
{
// Get the child categories when we get this category
$this->getChildCategories();
}
/**
* Get the child categories
* @return array
*/
public function getChildCategories()
{
if ($this->children) {
return $this->children;
}
return $this->children = self::getCategories("parent = {$this->id}");
}
////////////////////////////////////////////////////////////////////////////
/**
* The top-level categories (i.e. no parent)
* @return array
*/
public static function getTopCategories()
{
return self::getCategories('parent = 0');
}
/**
* Get categories from the database.
* @param string $where Conditions for the returned rows to meet
* @return array
*/
public static function getCategories($where = '')
{
if ($where) $where = " WHERE $where";
$conn=mysqli_connect('localhost', 'root', '','praktikum');
$sql = "SELECT * FROM nugget$where";
$result = mysqli_query($conn,$sql);
$categories = array();
while ($category = mysqli_fetch_object($result, 'Category'))
$categories[] = $category;
mysqli_free_result($result);
return $categories;
}
}
?>
that has this output
[{
"id": "1"
, "parent": "0"
, "name": "WI2"
, "children": [{
"id": "2"
, "parent": "1"
, "name": "E-Business"
, "children": [{
"id": "4"
, "parent": "2"
, "name": "Vorlesung"
, "children": []
}, {
"id": "5"
, "parent": "2"
, "name": "Uebung"
, "children": []
}]
}, {
"id": "3"
, "parent": "1"
, "name": "E-Procurement"
, "children": [{
"id": "6"
, "parent": "3"
, "name": "Vorlesung"
, "children": []
}, {
"id": "7"
, "parent": "3"
, "name": "Uebung"
, "children": []
}]
}]
}]
and I want to have the Output instead of the text behind "json" in this javascript method that is in an seperate file (example.js):
function init(){
//init data
var json = { /*
Hier stehen die ganzen Kinder drinnen
Einzelne Children durch Datenbankeinträge ersetzen
*/
**"id": "1"
, "parent": "0"
, "name": "WI2"
, "children": [{
"id": "2"
, "parent": "1"
, "name": "E-Business"
, "children": [{
"id": "4"
, "parent": "2"
, "name": "Vorlesung"
, "children": []
}, {
"id": "5"
, "parent": "2"
, "name": "Uebung"
, "children": []
}]
}, {
"id": "3"
, "parent": "1"
, "name": "E-Procurement"
, "children": [{
"id": "6"
, "parent": "3"
, "name": "Vorlesung"
, "children": []
}, {
"id": "7"
, "parent": "3"
, "name": "Uebung"
, "children": []
}]
}]**
};
so how do I get the variable $categories in the javascript file so json has the same output inside as I get when proceding: 'echo json_encode($categories); without the [{ tag at beginning and at the end.'
Tried with $.get("Testerich.php"); and other funtcions but it didnt work.
Thanks for your help aladin
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