Add and Remove Products HTML Activity

 

<!DOCTYPE html>

<html>

<head>

Add and Remove

<meta name="viewport" content="width=device-width, initial-scale=1">

</head>

<body>

<h1 class="font1"> Products and Price Select box</h1>

<div id="container">

<form>

<fieldset>

<label for="name"> * add products: </label>

<input type="text" id="name" placeholder="Enter Product" autocomplete="off"> <br> <br>

<label for="price"> * add price: </label>

<input type="number" id="price" placeholder="Enter Price" autocomplete="off"> <br> <br>

<br>

<button class="btn" id="btnAdd" size=10> <b> Add Product </b> </button> <br>

<div class="row">

<div class="column">

<label for="list"> * Product List: </label> <br>

<select id="list" name="list" multiple size=10>

<option value="apple"> Apple </option>

<option value="Banana"> Banana </option>

</select>

</div>

<div class="column">

<label for="list"> * Price List: </label> <br>

<select id="price-list" name="price-list" multiple size=10>

<option value="40"> 40 </option>

<option value="60"> 60 </option>

</select>

</div>

</div>

<button class="btn: id="btnRemove:> <b> Remove Product </b> </button> <br>

</div>

</fieldset>

</form>

<script>

const btnAdd = document.querySelector('#btnAdd');

const btnRemove = document.querySelector('#btnRemove');

const selectbox = document.querySelector('#list');

const priceselectbox = document.querySelector('#price-list');

const name = document.querySelector('#name');

const price = document.querySelector('#price');

var prod =

btnAdd.onclick = (e) => {

e.preventDefault();

if (name.value == '') {

alert('please enter the name.');

return;

}

if (price.value == '') {

alert('please enter the price.');

return;

}

const option = new Option(name.value, name.value);

const optionprice = new Option(price.value, price.value);

selectbox.add(option, undefined);

priceselectbox.add(optionprice, undefined);

name.value='';

price.value='';

name.focus();

}

btnRemove.onclick = (e) => {

e.preventDefault();

let selected = [];

for(let i = 0; i < selectbox.options.length; i++) {

select[i] = selectbox.options[i].selected;

}

const noneSelected = selected.every(x => !x);

if (noneSelected) {

for (let i = 0; i <priceselectbox.options.length; o++) {

selected[i] = priceselectbox.options[i].selected;

}

}

let index = selectbox.options.length;

while (index--) {

if (selected[index]) {

selectbox.remove(index);

priceselectbox.remove(index);

}

};

}

</script>

</body>

</html>

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