PHP pathinfo

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);

// multiline string old school tip trick
// create elemnt div style none or hidden with text
var sMulitilineString = document.getElementById('idHiddenDiv').innerHTML; // get text from hidden div

// ES6 with quotes
const htmlString = 'Say hello to 
multi-line
strings!';

(typeof "813") // string
(typeof 813) //  number

parseInt("10.33") // returns 10 string to integer
parseInt('2def8'); // 2
parseInt('a2def8'); // NaN

parseFloat("10.33") // returns 10.33 string to float

var test_1 = 'string';
var test_2 = ' example';
var suma = test_1 + test_2;
var length = suma.length; // 14
var le = test_1.length; // 6

charAt(index) 
/*  Returns the character at the specified index */
 var str = new String('Sample'); 
 str.charAt(3)); // p
// startsWith
var str = "HELLO WORLD";
  var res = str.charAt(0); // H
// endsWith
  var res = str.charAt(str.length - 1); // D

charCodeAt(index) 
/*  Returns an integer representing the Unicode encoding 
of the character at the specified location */
 var str = new String('Sample'); 
 str.charCodeAt(3)); // 112

fromCharCode([code1[, code2[, ...[, codeN]]]]) 
/*  Returns a string from a number of Unicode character values */
      var e = window.event;
      var str = String.fromCharCode(e.keyCode); // keydown etc.

concat([item1[, item2[, . . . [, itemN]]]]) 
/*  Returns a new array consisting of a combination of two or more arrays  */
    var arr1 = new Array("Hello, ", "Dolly uranove");
    var arr2 = new Array("World!", "dort");
    var myConcatArray = arr1.concat(arr2);
    alert(myConcatArray[3]); // dort

concat([string2[, string3[, . . . [, stringN]]]]) 
/*  Returns a string value containing the concatenation 
of two or more supplied strings */
    var string1 = new String("Hello, ");
    var string2 = new String("World!");
    var myConcatString = string1.concat(string2); // Hello, World!


indexOf(subString[, startIndex]) 
/*  Returns the character position where the first occurrence 
of a substring occurs within a String object */

lastIndexOf(substring[, startindex]) 
/*  Returns the last occurrence of a substring within a String object */

localeCompare(stringExp) 
/*  Returns a value indicating whether two strings 
are equivalent in the current locale */
var str1 = "1";
var str2 = "2";
var n = str1.localeCompare(str2); // -1
var str1 = "2";
var str2 = "2";
var n = str1.localeCompare(str2); // 0
var str1 = "a";
var str2 = "b";
var n = str1.localeCompare(str2); // -1
var str1 = "b";
var str2 = "a";
var n = str1.localeCompare(str2); // 1

match(rgExp) 
/*  Executes a search on a string using a regular expression 
pattern, and returns an array containing the results of that search */

var rgExp = /some text/g;
replace(rgExp, replaceText) 
/*  Returns a copy of a string with text replaced 
using a regular expression or search string */

search(rgExp) 
/*  Returns the position of the first substring 
match in a regular expression search */
n      // A newline character 
.       // Any character except a newline 
r      // A carriage return character 
t      // A tab character 
b      // A word boundary (the start or end of a word) 
B      // Anything but a word boundary 
d      // Any digit (same as [0-9]) 
D      // Anything but a digit (same as [^0-9]) 
s      // Single whitespace (space, tab, newline, etc.) 
S      // Single nonwhitespace 
w      // A "word character” (same as [A-Za-z0-9_]) 
W      // A "nonword character” (same as [^A-Za-z0-9_])


slice(start, [end]) 
/*  Returns a section of an array or string */
    var myString = new String("This is a test");
    var mySlice = myString.slice(2,6); // is i   // pos: 2 to 5 // 0==T, 1==h, 2==i, 3==s, 4==" ", 5==i
mySlice = myString.slice(-3); // est // end of string
mySlice = myString.slice(0); // This is a test

split([separator[, limit]]) 
/*  Returns the array of strings that results 
when a string is separated into substrings */
 var str = "one two three";
 var  words = str.split(" ");
 var len = words.length; // 3

substring(start, end) 
/*  Returns the substring at the specified location 
within a String object */
var inpTxt = "Hello there";
alert(inpTxt.substring(6, 10)); // ther

substr(start [, length ]) 
// Returns a substring beginning at a specified 
// location and having a specified length
   var s = "The love in Spain.";
   ss = s.substr(12, 5);  // Spain

tolocaleLowerCase() 
/*  Returns a string where all alphabetic characters 
have been converted to lowercase, taking into account 
the host environment's current locale */

toUpperCase() 
/*  Returns a string where all alphabetic characters 
have been converted to uppercase */

var myString = "My text";
myString.anchor //places an HTML anchor with a NAME attribute around specified text in the object
myString.big
myString.blink
myString.bold
myString.concat
myString.fixed
myString.fontcolor
myString.fontsize
myString.charAt
myString.charCodeAt
myString.indexOf
myString.italics
myString.lastindexOf
myString.length
myString.link
myString.match
myString.replace
myString.search
myString.slice
myString.small
myString.split
myString.strike
myString.sub //places HTML SUB tags around text in a String object
myString.substr
myString.substring
myString.sup
myString.toLowerCase
myString.toString
myString.toUpperCase
myString.valueOf
var str = "58";
var res = str.valueOf();
var type = (typeof res); // string
var str = 58;
var res = str.valueOf();
var type = (typeof res); // number

Timer in javascript example source code will opening random link in random time.

// setTimeout() 
// clearTimeout()

var start = new Date();

function timedCount()
{
 var now = new Date();
 var resultMilliSeconds = now.getTime() - start.getTime();
 // create some div with id txt
 document.getElementById('txt').innerHTML = resultMilliSeconds;
}
var t = setTimeout("timedCount()",1000);
// clearTimeout(t); // for stopping create button with onclick clearTimeout(t)

Použití timeru v javasciptu. Příklad otvírá náhodně náhodný odkaz v okně prohlížeče za náhodný časový interval.

var c=0;
var t = new String().toString();
var t2 = new String().toString();
var timer_is_on=0;
var newWindow;
function open2(url, opt){
  if (opt == 0) // current window
    window.location = url;
  else if (opt == 1){ // new window
   if(newWindow) newWindow.open(url,"_parent");
   else
   newWindow = window.open(url);
   
   }
  else if (opt == 2) // background window
    {window.open(url); self.focus();}
}
var ar = new Array (
"https://www.okhelp.cz/polevky/"
,"https://www.okhelp.cz/auto-moto/"
,"https://www.okhelp.cz/pc-mobily/"
);

function timedCount()
{
var randomnumber=Math.floor(Math.random()*ar.length)
open2(ar[randomnumber],1);

document.getElementById('txt').value=c;
c=c+1;
t=setTimeout("timedCount()",1000 * (randomnumber + 4));

}

function doTimer()
{
if (!timer_is_on)
  {
  timer_is_on=1;
  timedCount();
  
  }
}

function stopCount()
{
clearTimeout(t);
clearTimeout(t2);

timer_is_on=0;
}    
    </script>
    
    
</head>
<body>

<form>
<input type="button" value="Start count!" onClick="doTimer()">
<input type="text" id="txt">
<input type="button" value="Stop count!" onClick="stopCount()">
</form>

Odkazy na online regex editory:

https://regex101.com/


https://www.debuggex.com/r/LyIpMYTAhJ9Gja4x

Textarea selection - získání pozice karety kurzoru.

     // FOR Gecko Browser selectionStart / selectionEnd selection length
 function getPos(){
     if	(typeof document.getElementById('idTextarea').selectionStart != 'undefined') {
        var nPosCursor = document.getElementById('idTextarea').selectionStart; 
        var nEndPos = document.getElementById('idTextarea').selectionEnd;
   return nPosCursor; 
   }
   return 0; // or -1 
}

// source by javascript-array.com/guides/javascript_faq/
//Internet Explorer 4+, Mozilla/Gecko/Firefox
function getCaretPos(obj)
{
  obj.focus();
  
  if(obj.selectionStart) return obj.selectionStart; //Gecko
  else if (document.selection) //Internet Explorer
  {
    var sel = document.selection.createRange();
    var clone = sel.duplicate();
    sel.collapse(true);
    clone.moveToElementText(obj);
    clone.setEndPoint('EndToEnd', sel);
    return clone.text.length;
  }
  
  return 0;
}