javascript/java.html at main · Shaikh-Dilshad/javascript · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width= , initial-scale=1.0">
    <title>Document</title>
</head>
c <style>
    * {
        margin: 0;
        padding: 0;
    }

    .container {
        border: 2px solid red;
        background: cyan;
        margin: 3px 0px;
        padding: 5px;
    }

    .background {
        background-color: black;
    }

    .text {
        color: white;
    }

    .power {
        background: black;
        border: 2px solid red;
        color: white;
        padding: 9px;
    }
</style>

<body>
    <h1>this new start of javascript</h1>
    <div id="firstcontainer" class="container">
        <button id="click" onclick="clicked()">click me</button>
        <!-- <button id="click" onclick="document.getElementById('demo').innerHTML=Date()">click me</button>
        <p id="demo"></p> -->
        <!-- <button id="click" onclick="this.innerHTML=Date()">click me</button> -->
    </div>
    <div id="asifa" class="container">
        <button id="fatima" onclick="clickedd()">to know</button>
        <p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Temporibus, laborum!</p>
    </div>
    <div id="dil" class="container">
        <p>power this society is never change and i will be keep learning</p>
    </div>
    <script>
        //1.   ways to print in javascript
        // alert("me")
        // document.write("This is new world")
        //2.  javascript console api
        //  console.log("Hellow world")
        //  console.warn("This is warning")
        // console.error("This is error")

        //  3. what are variables
        //what is variables- containers to store the values
        var num1 = 34;
        var num2 = 36;
        // console.log(num1 + num2);

        // 4. data type in javascript
        // number
        var number1 = 344;
        var number2 = 36.4;
        // string
        var str1 = "This is a string";
        var str2 = "This is a new string"
        // objects
        var marks = {
            faizan: 34,
            fahad: 56,

        }
        // console.log(marks)
        // bolean
        var a = true;
        var b = false;
        // console.log(a ,b);

        //at a very high level. there are two types of data types in java script
        // 1. primitive data types: null undefine number string bolean symbol
        //2. reference data types: objects and arrays
        var arr = [1, 2, 3, 4, 5]
        // console.log(arr)
        //operators in java scripts
        // arthematic operator
        var a = 34;
        var b = 10;
        // console.log("This value of a + b", a+b);
        // console.log("This value of a - b", a-b);
        // console.log("This value of a * b", a*b);
        // console.log("This value of a / b", a/b);
        //assigment operators
        var c = b;
        c -= 2;   //c=c-2
        // c += 2;  c=c+2
        // c *= 2;   c=c*2
        // c /= 2;   c=c/2

        // console.log(c)

        // comparison operators
        // var x = 34;
        // var y = 36;
        // console.log(x==y);
        // console.log(c >= y);
        // console.log(x <= y);

        // logical operators (&&)
        //    console.log(true && true)
        //    console.log(false && true)
        //    console.log(true && false)

        // logical operators or(||)
        //    console.log(true || false)
        //    console.log(false || false)

        // logical not
        //  console.log(!false)
        //  console.log(!true)
        // function in javascript
        function avg(a, b) {
            c = (a + b) / 2;
            return c;
        }
        c1 = avg(400, 650);
        c2 = avg(350, 650);
        //   console.log(c1);
        //   console.log(c2);

        //if and else function
        var age = 8;
        // if (age > 9){
        //     console.log('This is not a kid');
        // }
        // else{
        //     console.log("Your are a kids");
        // }
        age = 31; //var can be rewrite
        // if else ledder
        // if(age < 10 ){
        //     console.log("you are kid");
        // }
        // else if(age < 18){
        //     console.log("you are young");
        // }
        // else if(age < 30){
        //     console.log("You are adult");
        // }
        // else{
        //     console.log("your are old")
        // }
        var arr = [1, 2, 3, 4, 5, 6];
        for (var i = 0; i < arr.length; i++) {
            // if(i == 3){
            //     // break;
            //     // continue
            // }
            // console.log(arr[i])
        }
        // arr.forEach(function(element){
        //     console.log(element)
        // }
        // )

        // while loop
        // let j = 0;
        // while (j < arr.length) {
        //     console.log(arr[j]);
        //     j++;
        // }
        // do{
        //     console.log(arr[j]);
        //      j++;
        // }while(j<arr.length);
        let myArr = ["new", "power", 34, "null", "anime"];
        //   myArr.push("power");
        // myArr.shift();
        // myArr.pop();
        // const newline = myArr.unshift("power");
        // console.log(newline);
        //   console.log(myArr);
        let myString = "This is a new string";
        //  console.log(myString.length)
        //   console.log(myString.indexOf("new"))
        // d = myString.replace("This", "We");
        // d = d.replace("new", "old")
        // console.log(d, myString);

        // let myDate = new Date();
        // console.log(myDate.getTime());
        // console.log(myDate.getSeconds());
        // console.log(myDate.getDay());

        // dom ,amanipilation
        let elem = document.getElementById("click")
        //   console.log(elem);

        let elemClass = document.getElementsByClassName("container");
        // console.log(elemClass);
        //targeting    // elemClass[0].style.background = "yellow"
        //adding class in elements
        elemClass[0].classList.add("background")
        elemClass[0].classList.add("text")
        // removing class in elements
        // elemClass[0].classList.remove("background")

        // finding any elements inner html
        // console.log(elemClass[0].innerHTML);
        // console.log(elemClass[0].innerText);
        tn = document.getElementsByTagName("div")
        console.log(tn);
        //aappenchild
        createdElement = document.createElement('p');
        createdElement.innerText = "this is new dream";
        tn[0].appendChild(createdElement);

        dilshad = document.createElement('p');
        dilshad.innerText = "This is new form new build";
        tn[1].appendChild(dilshad);
        //remove child
        //  tn[1].removeChild(dilshad);

        zeeshan = document.createElement("p")
        zeeshan.innerText = "This is new line"
        tn[2].appendChild(zeeshan);
        //replacechild
        zeeshan2 = document.createElement('b')
        zeeshan2.innerText = "This is a bold";
        tn[2].replaceChild(zeeshan2, zeeshan);

        //selecting querry
        //   sel = document.querySelector('.container')
        //   console.log(sel)
        //   sel = document.querySelectorAll(".container")
        //   console.log(sel)
        //    sel = document.querySelector(".container")
        //    sel.querySelector("p").style.backgroundColor = 'green'
        //    sel = document.querySelectorAll('p')
        //    for(i=0;i<sel.length;i++){
        //     sel[i].style.backgroundColor = 'red';
        //    }

        // event in javascript
        //     function clicked(){
        //         console.log("This is clicked")
        //     }
        //   function clickedd(){
        //     console.log("MY NAME IS DILSHAD TRYINNG TO LEARN")
        //   }
        //    firstcontainer.addEventListener('click', function(){
        //     document.querySelectorAll(".container")[1].innerHTML = "<b> we changed into bold"
        // console.log("This was clicked")
        //    })
        // asifa.addEventListener('click', function(){
        //     document.querySelectorAll(".container")[2].innerHTML = "<b> we jumped to third"
        //     console.log("mouseout will go in and shows")
        // })
        // dil.addEventListener("mouseout", function(){
        //     console.log("mouseout will go out and shows")
        // }
        // firstcontainer.addEventListener('mouseup', function(){
        //     console.log("This is clicked")

        // })
        // firstcontainer.addEventListener("mousedown", function(){
        //     console.log("This is down ")
        // })
        // )
        // let prevHTML = document.querySelectorAll('.container')[1].innerHTML;
        //    firstcontainer.addEventListener('mouseup', function(){
        // document.querySelectorAll('.container')[1].innerHTML = prevHTML;
        // console.log("mousup after clicking will shows")
        //    })
        //    firstcontainer.addEventListener('mousedown', function(){
        //     document.querySelectorAll(".container")[1].innerHTML = "<b> we jumped to third </b>"
        //     console.log("mousedown after releasing clicking will shows")
        //    })

        //arrow function
        // 1. normal function
        // function summ(a,b){
        //     return a + b;
        // }
        //2.  arrow function
        summ = (a, b) => {
            return a + b;
        }
        // settimeout
        logkaro = () => {
            document.querySelectorAll('.container')[1].innerHTML = "<b>This is set timeout</b>"
            console.log("this is setTimeout")
        }
     // to cancel settimeout/setinterval we use cleaarTimeout(clr)/clerInterval(clr)
     //only one execcuted
    //  setTimeout(logkaro, 2000)
    //infinnite executed
        // CLR = setInterval(logkaro, 2000);
        // json in javascript
        // stringify convert object into json string
        // obj = {name:"Dilshad",length:1,a:{"the":"that"}}
        // jso = JSON.stringify(obj)
        // console.log(typeof jso)
        // console.log(jso)
       // parse convert json string into javascript object
    //    Parsed = JSON.parse('{name:"Dilshad",length:1,a:{"the":"that"}}');
    //    console.log(Parsed);


    </script>
</body>

</html>