PHP Adresa ip

// IF variable is not defined (or has a falsey value) THEN set it to an empty object.
// ELSE do nothing (technically speaking, variable gets assigned to itself)
var variable = variable  ||  {} ;

function test(){
   console.log(1);
}
// when called
test(); // 1
// or
var a = test;
a(); // 1

// or autocall if code executed
var test2 = function(){
  console.log(2);
}
// test2 is undefined because the function test2 has no return value

// return string
function stringTest(param) {
    return 'Hello ' + ' ' + param;
}

console.log(stringTest("Alice"));  // Hello Alice

// return number
function numberTest(param) {
    return 6 + param;
}

console.log(numberTest(5));  // 11

// or autocall if code executed 
// function is like other variables
// parenthesis is for made groups or call functions.
// Immediately-Invoked Function Expression,
// or IIFE for short. It executes immediately after it’s created.
(function(){
  // all your code here
  var foo = function() {};
  window.onload = foo;
  // ...
})();

// foo is unreachable here (it’s undefined)

//////////////////////////////
// IIFE Immediately Invoked Funtion Expression
var greeting = function(name) {
    return 'Hello ' + ' ' + name;
}('John');

console.log(greeting);  // Hello John
console.log(typeof greeting);  // string
console.log(greeting('Suzan'));  // Uncaught TypeError: greeting is not a function


///////////////////////
var val = (function(){
     var a = 0;  // in the scope of this function
     return function(x){
         a += x;
         return a;
     };
})();

alert(val(10)); //10
alert(val(11)); //21

///////////////////////
// create the structure

var testHash = {
   a : 1,
   b : function(){
      console.log(4);
   },
   c: function(param){
	   var num = param +5;
	   return num;
   }
}
console.log(testHash.a); // 1
testHash.b(); // 4
testHash['b'](); // 4
testHash.c(7); // 12

/////////////////////////
// or function like class
function TestClass(n) {
    this.some_property = n;
    this.some_method = function() {
       console.log(this.some_property);
    };
}

var foo = new TestClass(3);
var bar = new TestClass(4);
foo.some_method(); // 3
bar.some_property += 2;
bar.some_method(); // 6
// console.log(some_property); // Uncaught ReferenceError: some_property is not defined

//////////////////////////
function Car(brand, year) {
	return {
		brand: brand,
		year: year
	}
}
var honda = Car("Honda", 1999); 
console.log(honda.brand); // Honda
console.log(honda.year);  // 1999 

honda.brand = "Honda new Generation";
honda.year = 2021; 
console.log(honda.brand); // Honda new Generation
console.log(honda.year); // 2021

var mazda = Car("Mazda",1987);
console.log(honda.brand); // Honda new Generation
console.log(mazda.brand); // Mazda

//////////////////////////////////////
// simplified code 

 var TEST_CLASS = TEST_CLASS || {};

TEST_CLASS.pokus = TEST_CLASS.pokus || (function() {
    // -------------------------------------------------------------------------
    // Private static variables and methods
    // -------------------------------------------------------------------------
    
    var privateStaticNumber = 5;
    var privateStaticString = "My privateStaticString: ";
    var privateStaticArray = [];

	function privateStaticMethod(){
		console.log('privateStaticMethod');
	}

	// CONSTRUCTOR CTOR
	return function(config) {
		 // ----- private variables -----

        var me = this,
        isPaused = false;
		this.privateStaticNumber = config.firstParam;
		this.privateStaticString = privateStaticString + config.secondParam; // += produce: undefined I am from secondParam
		this.privateStaticArray = config.thirtParam;
			
		// ----- private methods -----
        function getMode (mode, speed) {
			// document.getElementById(mode).addEventListener('click', function () { snakeSpeed = speed; });
		}
		
		// ----- public variables -----
        me.correct = 0;
        me.wrong = 0;
		
		// ----- public methods -----
        
        me.setString = function(val) {
            this.privateStaticString = val;
        };
        me.getString = function() {
            return this.privateStaticString;
        };
		me.publicMethod = function(param){
			console.log(param + ' from me.publicMethod()');
		};

	
	}; // end CTOR
})();
// end TEST_CLASS.pokus

var _me = _me || {};
var _me_test = new TEST_CLASS.pokus({firstParam:8, secondParam:" I am from secondParam", thirtParam:[1,3,9]});
// TEST_CLASS.pokus.privateStaticMethod(); // is not a function
// TEST_CLASS.pokus.publicMethod("Hola!"); // TEST_CLASS.pokus.publicMethod is not a function
// TEST_CLASS.publicMethod("Hola hej!"); // TEST_CLASS.publicMethod is not a function
 
// TEST_CLASS.pokus.publicMethod(" Hello!"); // is not a function
_me_test.publicMethod(" Hello!"); //  Hello! from me.publicMethod()
console.log( _me_test.getString()); // My privateStaticString:  I am from secondParam
console.log( _me_test.isPaused); // undefined
 

Date: 04.11.2020 - 23:14

Getter a Setter
Získej nebo Nastav.

Třídy v javascript dovolují použití get a set instrukci.
get vrátí hodnotu určité zadané proměnné.
set jí může změnit.

Díl navazuje na 1. díl Třídy v Javascript

class Person {
  constructor(name) {
    this.personName = name;
  }
  get pname() {
    return this.personName;
  }
  // i kdyz set vypada jako funkce, musi mit pouze jeden parametr
  set pname(x) {
    this.personName = x;
  }
}

var myFriend = new Person("Michael");

Jméno osoby přítele získáme například:

var strMyFriendName = myFriend.pname; // bez () na konci!!!!!!
alert(strMyFriendName);

Michal už není Váš kamarád, tak jej změníte pomocí set:

// hodnota se nepřirazuje do závorek (), ale pomocí = rovná se!!!!
myFriend.pname = "Renata";
strMyFriendName = myFriend.pname;
alert(strMyFriendName);

Pokud chceme vytvořit soubor, jehož obsah bude čten, jako UTF-8 UNICODE stačí vstupní string nechat projít funkcí utf8_encode. Pokud pak například text souboru použijeme v php scriptu v kódování UTF-8, text souboru bude správně zobrazen.

  $fHnd = fopen($newName, "w");
  $row = utf8_encode('řčšě');  
  fwrite($fHnd, $row."\r\ n");
  fclose($fHnd);

Tohle jsou některé metody objektu document

clear
createDocument
createDocumentFragment
createElement
createEvent
createEventObject
createRange
createTextNode

getElementById
/* nejpouzivanejsi metoda objektu document, ktera
ziska handle elementu dle jeho id*/

getElementByTagName
var e = document.getElementById('list');
e= e.getElementsByTagName('span');
i=0;
while(i < e.length){ 
 e[i].style.color = "green";
}

write
document.write("some text");

Jak získat obsah určité složky příklad v php.

/*************************
 * vyhleda soubory s prislusnou koncovkou
 * a vrátí nejmladsi soubor 
 * $extension
 */ 
  function getFileFromDir($path, $extension)
  { // BEGIN function getFileFromDir
  	    $fileReturn; $z = 0;
    if (is_dir ($path)) {
       $dh = opendir($path); // or die (" Directory Open failed !");
       
       while ($file = readdir($dh)){
            //print $file.'<br />';          
          if (is_file($path.$file)) { 
            //print $file.'<br />';
            $ar = explode(".", $file);
            if (count($ar) > 1) { 
            	if (strtolower($ar[count($ar) - 1])  == $extension) { // "zip", "exe" or other extension
                 $fileReturn[$z][0] =  date ("Ymd", filemtime($path.$file));                 
                 $fileReturn[$z][1] = $file;
             	   $z++;
                //break;
              }
            }	
          }
        }

       closedir ($dh);
    }
    if ($fileReturn) { 
        sort($fileReturn);
        return $fileReturn[count($fileReturn) - 1][1];    	
    }

  } // END function getFileFromDir
  /***************************