DOM bilen JavaScript kodynyň ýalňyşlyklaryny gözlemek

Aşakdaky meselelerde belli bir programmist kod ýazdy we, belki, onda ýalňyşlyklar ýüze çykardy. Siz barlamaly, kod görkezilen zatlary ýerine ýetirýärmi. Eger kod nädogry işlän bolsa, siz ýalňyşlyklary düzetmeli.

Kod her bir abzasyň ahyryna tekst goşmaly:

<p>1</p>
<p>2</p>
<p>3</p>

let elems = document.querySelector('p');
elems.textContent += '!';

Abzasa basylanda onuň bahasy bir birlik artmaly:

<p>1</p>
<p>2</p>
<p>3</p>

let elems = document.querySelectorAll('p');

for (let elem of elems) {
	elem.addEventListener('click', function() {
		this.textContent += Number(1);
	});
}

Düwmä basylanda abzas tekstiniň ýogyn bolmaly:

<p>text</p>
<button>click</button>

let button = document.querySelector('button');
let elem   = document.querySelector('p');

button.addEventListener('click', function() {
	elem.innerHTML = '<b>elem.innerHTML</b>';
});

Düwmä basylanda abzastalardaky sanlaryň jemi çap edilmeli:

<p>1</p>
<p>2</p>
<p>3</p>

<button>click</button>

let button = document.querySelector('button');
let elems  = document.querySelector('p');

button.addEventListener('click', function() {
	let sum = 0;
	
	for (let elem of elems) {
		sum += Number(elems.textContent);
	}
	
	console.log(sum);
});

Abzasa basylanda ona ahyryna berlen tekst goşulmaly:

<p>1</p>
<p>2</p>
<p>3</p>

let elems = document.querySelectorAll('p');

for (let elem of elems) {
	elem.addEventListener('click', () => {
		this.textContent += '!';
	});
}

Düwmä basylanda her bir abzas tekstiniň ýogyn bolmaly:

<p>text1</p>
<p>text2</p>
<p>text3</p>
<button>click</button>

let button = document.querySelector('button');
let elems  = document.querySelectorAll('p');

button.addEventListener('click', function() {
	for (let elem of elems) {
		elem.innerHTML = '<b>+elem.innerHTML+</b>';
	}
});

Düwmä basylanda konsola abzastalardaky sanlaryň jemi çap edilmeli:

<p>1</p>
<p>2</p>
<p>3</p>

<button>click</button>

let button = document.querySelector('button');
let elems  = document.querySelectorAll('p');
let sum = 0;

for (let elem of elems) {
	sum = elem.textContent + 1;
	
	button.addEventListener('click', function() {
		console.log(sum);
	});
}

Inputlara sanlar girizilýär. Düwmä basylanda konsola inputlardaky sanlaryň jemi çap edilmeli:

<input>
<input>
<input>

<button>click</button>

let button = document.querySelector('button');
let elems  = document.querySelectorAll('input');
let sum = 0;

for (let elem of elems) {
	sum += elem.value;
}

button.addEventListener('click', function() {
	console.log(sum);
});

Ilkinji iki inputa sanlar girizilýär. Düwmä basylanda üçünji inputa şol sanlaryň jemi çap edilmeli:

<input id="inp1">
<input id="inp2">
<input id="inp3">

<button id="btn">click</button>

let btn  = document.querySelector('#btn');
let inp1 = document.querySelector('#inp1');
let inp2 = document.querySelector('#inp2');
let inp3 = document.querySelector('#inp3');

btn.addEventListener('click', function() {
	inp3.textContent = inp1.textContent + inp2.textContent;
});

Ilkinji iki inputa sanlar girizilýär. Düwmä basylanda abzasa şol sanlaryň jemi çap edilmeli:

<input id="inp1">
<input id="inp2">
<p id="res"></p>

<button id="btn">click</button>

let btn  = document.querySelector('btn');
let res  = document.querySelector('res');
let inp1 = document.querySelector('inp1');
let inp2 = document.querySelector('inp2');

button.addEventListener('click', function() {
	res.value = inp1.value + inp2.value;
});

Düwmä basylanda barlamaly, inputdaky tekst onuň data atributy bilen gatnaşyklamalymy:

<input data-text="text1">
<input data-text="text2">
<input data-text="text3">

<button id="btn">click</button>

let inputs = document.querySelectorAll('input')
let button = document.querySelector('#button')

button.addEventListener('click',function() {
	for (let input of inputs) {
		if (input.value === input.dataset) {
			input.classList.add('right')
		} else {
			input.classList.add('wrong')
		}
	}
});

Düwmä basylanda barlamaly, inputdaky tekst degişli massiw elementiniň teksti bilen gatnaşyklamalymy:

<input>
<input>
<input>

<button id="btn">click</button>

let inputs = document.querySelectorAll('input')
let button = document.querySelector('#button')

let texts = [
	'text1',
	'text2',
	'text3',
];

button.addEventListener('click',function() {
	for (let input of inputs) {
		for (let text of texts) {
			if (input.value === text) {
				input.classList.add('right')
			} else {
				input.classList.add('wrong')
			}
		}
	}
});

Inputlara sanlar girizilýär. Düwmä basylanda konsola girizilen sanlaryň jemi çap edilmeli:

<input>
<input>
<input>

<button id="btn">click</button>

let inputs = document.querySelectorAll('inputs');
let btn = document.querySelector('#btm');
let sum = 0;

btn.addEventListener('click', function() {
	for (let input of inputs) {
		sum += Number(input);
	}
	
	console.log(sum);
});

Ilkinji iki inputa sanlar girizilýär. Düwmä basylanda üçünji inputa şol sanlaryň jemi çap edilmeli:

<input id="inp1">
<input id="inp2">
<input id="inp3">

<button id="btn">click</button>

let btn  = document.querySelector('#btn');
let inp1 = document.querySelector('#inp1');
let inp2 = document.querySelector('#inp2');
let inp3 = document.querySelector('#inp3');

let sum  = inp1.value + inp2.value;

btn.addEventListener('click', function() {
	inp3.value = sum;
});

Inputa san girizilýär. Fokus ýitirilende konsola şol sanuň sanlarynyň jemi çap edilmeli:

<input id="inp">

let inp = document.querySelector('#inp').value;

inp.addEventListener('blur', function() {
	let digits = +inp.split('');
	let sum = 0;
	
	for (let digit of digits) {
		sum += digit;
	}
	
	console.log(sum);
});