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CASA ȘTIINȚEI / Pagini albastre / JavaScript  
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Mesaj Pagini: 1
blurex
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Inregistrat: acum 7 ani
Postari: 97
Sursa:

Code:

<script>
aici intra codul JavaScript in HTML pentru o 
</script>



Code:

<script src="JavaScript.js"> 
/* incarca codul dintr-un fisier */
</script>

================================
variabile

Code:

document.write("Salut lumea mea!");

var years = 35;
var someText = " years old ";
var gameOver = true;

alert (years + someText + gameOver); //afiseaza 35 years old true

=================================
operatori

Code:

var number1 = 7;
var number2 = 4;

number1 += number2;
number1++;

document.write (number1);

//afiseaza 12


==================================
funcții

Code:

function addSomething (num, str)
{
    var add = num + str;
    alert (add);
}

addSomething (455, " Programs to write"); //afiseaza "455 Programs to write"

===============================
condiții

Code:

var food = "Apples";
var mancare = "suficienta";

if(food == "Apple" && mancare != "nimic")
{
        alert("We ate an Apple");
}
else if(food == "Meat" || mancare == "nimic")
{
    alert("We did not eat an Apple, but we ate Meat");
}
else
{
    alert("Nebuine ai mancat!"); //afiseaza nebunie ai mancat
}

=============================
loops

Code:

/* 
var i = 1;

while(i < 5)
{
    document.write("A statement has run");
    i++;
}
*/

for(var i = 1; i < 5; i++)
{
    document.write("A statement has run ");
}

=================================
return

Code:

function add(x,y)
{
    result = x * y;
    return result;
}

var theResult = add(6,5);
document.write(theResult);

====================================
global and local variables

Code:

var name = "Ana"; //variabila globala

function printName()
{
    name2 = "Sandu"; //variabila globala
    var name3 = "Petrica"; //variabila locala
}

printName(); //se apeleaza functia, daca nu s-ar apela, n-ar aparea name2

document.write(name2); //afiseaza "Sandu"
document.write(name3); //nu afiseaza nimic pentru ca este variabila locala

=======================================
Pass by value

Code:

function battin(player, distance)
{
    var more = player + " hit the ball " + distance + " feet";
    document.write(more);
}

battin("Steve", 351); //afiseaza "Steve hit the ball 351 feet"

Nu "Steve", 351 sunt transmise functiei, ci programul copiaza valorile si le trimite functiei.

=======================================
Arrays

Code:

var roads = ["stone", "dirt", "cement", "tar"];
var roads[4] = "gravel";
var roadTravelled = roads[1];
document.write(roadTravelled); //afiseaza "dirt"

========================================
objects

Se separa prin virgula precum vectorii

Code:

var orc = 
{
    color: "green",
    height: 5,
    weight: 180,
    yell: function()
    {
        document.write("Orcs are the best");
    }
};
orc.yell(); //afiseaza "Orcs are the best"

orc.hair = "red";
delete orc.hair;
document.write(orc.hair); //afiseaza "undefined"

Functions inside objects are called methods

==================================
The String Objects

Code:

var hello = "Hello";

//hello = hello.length; //afiseaza 
//hello = hello.toUpperCase();
//hello = hello.charAt(4); //afiseaza "o"
//hello = hello.replace('Hello', 'Today'); //afiseaza "Today"
hello = hello.bold();
hello = hello.italics();

document.write(hello);

====================================
The Math Objects

Code:

var number = 4.7;
var newNumber = 26 + Math.round(number); //rotunjeste nr.
var newNumber = 26 + Math.ceil(number); //rotunjeste catre urmatorul numar intreg "5"
var newNumber = 26 + Math.floor(number); //rotunjeste catre partea intreaga "4"
var number = Math.sqrt(16); //face radical din 16 (=4)
document.write(newNumber);

====================================
The Date Objects

Code:

var todayDate = new Date();

todayDate.setYear(1785); //modifica anul

document.write(todayDate);

var useString = todayDate.toDateString(); //arata doar data

document.write(useString);

//datele sun scoase din systemclock

======================================
The DOM - Document Object Model

1. Browser loads page
2. DOM is created - objects that we can use that represents the HTML. Objects are stored in the DOM.

The DOM allows us to use our JavaScript code to acces parts of the web page.

<p id="ceva">Textul aici</p>

1. Element node (<p></p>)
2. Attribute node (id="ceva")
3. Text node ("Textul aici")

1. Need to grab the element ID. We can do that with the getelementbyid method.
2. Once we have the ID we are good to go and we can start to style the element with the style object which is another object in the DOM.

CSS                    JavaScript
---                    ----------
color                color   
border                border
margin                margin

background-color        backgroundColor
font-style            fontStyle
text-decoration        textDecoration

padding-left            padding-left
border-left            border-left

================================

Code:

getElementById

HTML

Code:

<!DOCTYPE html>
<html>

<head>
<script src="js.js">
</script>
</head>

<body>

<p id="para1">Text pentru milionari </p>
<button onclick="changeStyle()">Submit</button>

</body>

</html>

JavaScript

Code:

function changeStyle()
{
    //var text = document.getElementById("para1").style.color = "blue";
    //var text = document.getElementById("para1").style.backgroundColor = "blue";
    var text = document.getElementById("para1").style.fontStyle = "italic";
}

===================================

Code:

getElementsByTagName

HTML

Code:

<!DOCTYPE html>
<html>

<head>
<script src="js.js">
</script>
</head>

<body>

<p id="para1">Text pentru milionari </p>
<p id="para2">Text pentru milionari </p>
<p id="para3">Text pentru milionari </p>
<p id="para4">Text pentru milionari </p>
<button onclick="changeStyle()">Submit</button>

</body>

</html>

JavaScript

Code:

function changeStyle()
{
    var paragraph = document.getElementsByTagName("p");
    
    var changeParaText = paragraph[1].style.fontStyle = "italic"; //schimba doar elementul al doilea in Italice
    
    
}



Code:

function changeStyle()
{
    var paragraph = document.getElementsByTagName("p");
    
    for(var i = 0; i < paragraph.length; i++)
    {
        paragraph[i].style.fontStyle = "italic" //face toate paragrafele cu italic
    }
    
}

==================================

Code:

getElementsByClassName

ATENTIE: getElementsByClassName[0], getElementsByClassName[1], ... reprezinta elementele numerotate din clasa in ordinea aparitei lor

HTML

Code:

<!DOCTYPE html>
<html>

<head>
<script src="js.js">
</script>
</head>

<body>

<p class="para">Salutari multe </p>
<p class="para">din lumea milionarilor</p>
<p class="para"></p>
<button onclick="changeStyle()">Alt text</button>

</body>

</html>

JavaScript

Code:

function changeStyle()
{    
        var paragraph = document.getElementsByClassName("para");
        
        var firstParaText = paragraph[0].innerHTML;
        var secondParaText = paragraph[1].innerHTML;
        var addThem = paragraph[2].innerHTML = firstParaText + secondParaText;
        
        var firstParaText = paragraph[0].innerHTML = " ";
        var secondParaText = paragraph[1].innerHTML = " ";
}

In programul de mai sus se foloseste si

Code:

innerHTML

Cu innerHTML cele doua paragrafe din HTML sunt concatenate in paragraph[2] iar [0] si [1] primesc o valoare " " ca sa dispara.

=================================================================================

Code:

getElementsById

HTML

Code:

<!DOCTYPE html>
<html>

<head>
<script src="js.js">
</script>
</head>

<body>

<p class="para">Salutari multe</p>

<img src="ion.jpg" id="image"/> <br><br>

<button onclick="changeStyle()">Schimba imaginea</button>

</body>

</html>

JavaScript

Code:

function changeStyle()
{    
        document.getElementById("image").src="corneliu.jpg";
}

Schimbă imaginea cand se face click pe ea.

===================================================================================

Code:

events

1. Choose the element where we will place our event (in this case the button element)
2. Choose the event we want to use (in this case onclick)












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