JavaScript Math functions examples

IPV6 má jiný formát znaků a pokud se hlásíme na stránku pomocí IP tak navíc může být pokaždé jiná
i když dříve jsme měli pokaždé stejnou. Takže jak na to v php.
Získám IP adresu pomocí funkce:

function getip(){



if (getenv("HTTP_CLIENT_IP")) $ip = getenv("HTTP_CLIENT_IP");

else if(getenv("HTTP_X_FORWARDED_FOR")) $ip = getenv("HTTP_X_FORWARDED_FOR");

else if(getenv("REMOTE_ADDR")) $ip = getenv("REMOTE_ADDR");

else $ip = UNKNOWN;

return $ip;



}

Získanou adresu definuji jako konstantu, ALE jen tu část začátku, které se shoduje z IP například s předešlého dne
a ta bude vždy stejná:

define("MY_IPV6","2b00:1027:904d:9e6z");

Tu část pak porovnávám při kontrole zda se jedná o mou adresu:

$ip = getip();

if(  strpos($ip, MY_IPV6) !== false ){ 

  // kdyz je  moje IP provedu prihlaseni

}

Foreach fore each in javascript loop cycle example source code

Example code foreach for JavaScript.

var arr = new Array(1,2,3,4,5,6);// numbers or string put into array
for (var key in arr) {
    window.alert("My array"
                 + key
                 + " = "
                 + arr[key]);
}

// next example
arr.forEach(function(elem){
		console.log(elem);
	});

// next example
for (var i = 0; i < arr.length; i++) {
  alert (arr[i]);
}

// next example for GECKO MOZILLA FIREFOX
var soucet = 0;
var obj = {var1: 5, var2: 13, var3: 8};
for each (var item in obj) {
  soucet += item;
}
alert(soucet); // vysledek "26", coz je soucet 5+13+8

Each in jQuery get all document inputs type text and set value 0 if checkbox checked

function fc(th){
 if( th.checked ){
    $("input:text").each(
    function() {
        this.value = 0;
        this.disabled = true;
      }
    ); 

}else{
    $("input:text").each(
    function() {

        this.disabled = false;
      }
    ); 
}

<input type="checkbox"  id="idCheck"  onchange="fc(this);"> Checkbox 
 
<input type="text" size="1" id="id1"  value="0"  /> 

<input type="text" size="1" id="id2"  value="0"  /> 

How to sort array in javascript.

sort diacritical diakritika

function sortCZ(a, b) { 
var token = {'á': 'a', 'č': 'c', 'ď': 'd', 'é': 'e', 'ě': 'e', 'í': 'i', 'ň': 'n', 'ř': 'r', 'š': 's', 'ť': 't', 'ú': 'u', 'ů': 'u', 'ý': 'y', 'ž': 'z'}; 
var code_a = (token[a]) ? token[a].charCodeAt(0) + 0.5 : a.charCodeAt(0); 
var code_b = (token[b]) ? token[b].charCodeAt(0) + 0.5 : b.charCodeAt(0); 
// example s=115 š will 115.5 in array immediately after s OK :)
if(token[a]){
 some =  token[a].charCodeAt(0) + 0.5; // 115.5
 some = token[a].charCodeAt(0); // 115
 }

return code_a - code_b;  
} 

var ar = new Array("x","č","a","c","h","z","a","ř","e","ž","ě","ň","í","d","š"); 
ar.sort(sortCZ);

For all browsers e.g. old IE 11 ....

 <script>



        var mbThreadOneRunning = false;
        var mbThreadOneEnded = false;

        var mbThreadTwoRunning = false;
        var mbThreadTwoEnded = false;

        // you can create more than one Thread 
        // setTimeout() used for running more Threads at once
        var timeout_1 = setTimeout("ThreadOne()", 5000); // 5000 == 5 second
        var timeout_2 = setTimeout("ThreadTwo()", 3000); // 

        function ThreadOne() {
            mbThreadOneRunning = true;
            alert("1. ThreadOne working!");
            // working code here .............
            mbThreadOneEnded = true;
            clearTimeout(timeout_1);
        }

        function ThreadTwo() {
            mbThreadTwoRunning = true;
            alert("2. ThreadTwo working!");
            // working code here .............
             mbThreadTwoEnded = true;
            clearTimeout(timeout_2);
        }


        var mInterval = setInterval("checkThread()", 1000); // 1000 ms == 1 second, you can put smaller value

        function checkThread() {
            if (mbThreadOneEnded == true) {                
                alert("1. checkThread() ThreadOne finish work! " + mbThreadOneEnded);
            }
            else if (mbThreadTwoEnded == true) {
                alert("2. checkThread() ThreadTwo  finish work! " + mbThreadTwoEnded);
            }
            if (mbThreadOneEnded && mbThreadTwoEnded) {
                clearInterval(mInterval); // just to be sure
                mbThreadOneEnded = false;
                mbThreadTwoEnded = false;
                alert("ThreadOne and ThreadTwo ended ");
            }

        }


    


    </script>

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");