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Please please help with the code! Apperciate all the effort --create using html5, css3, and javas...

Please please help with the code! Apperciate all the effort

--create using html5, css3, and javascript.

--The interface permits the user to compute the number of primes in ranges of integer values.
--The interface should present the user with 4 pairs of "number" boxes in which 4 pairs of integer values can be entered. Each pair of values should be used by a thread to compute the number of prime numbers in that range, inclusive.
-- If any box is empty, then no thread should be created to compute the (empty) range.
--Provide a start button that the user can click when the above values have been entered.
--Finally, when the computation is complete, the number of primes in all ranges should be displayed on the page with a brief meaningful message.

--It is valid to assume that no range of numbers will include a number smaller than 3. All ranges are inclusive.

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Answer #1

Here is the output screenshot.

This is done using HTML,CSS and javascript only as requested.

*****************************************************************************************************************************************

Screenshot of the output:

Prime numbers Pair 1 Number 1 Number 1 Result: 127 131 137 139 149 Pair 2 Number 1 2 Number 1134 Result: 13 17 19 23 29 31 37

*****************************************************************************************************************************************

Code:

<!DOCTYPE html>
<html>
<style>
input[type=date],[type=text], select {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}

button {
width: 100%;
background-color: #4CAF50;
color: white;
padding: 14px 20px;
margin: 8px 0;
border: none;
border-radius: 4px;
cursor: pointer;
}

input[type=submit]:hover {
background-color: #45a049;
}

div {
border-radius: 5px;
background-color: #f2f2f2;
padding: 20px;
}
</style>
<body>

<center><h2>Prime numbers</h2></center>
<br>
<div>
<u><h3>Pair 1</h43></u><br><br>
<label for="number 1">Number 1</label>
<input type="number" id="pair_1_num_1">

<label for="number 2">Number 1</label>
<input type="number" id="pair_1_num_2">

<div>
<label for="number 1">Result : </label>
<span id="result1"></span>
</div>
</div>

<br>

<div>
<u><h3>Pair 2</h43></u><br><br>
<label for="number 1">Number 1</label>
<input type="number" id="pair_2_num_1">

<label for="number 2">Number 1</label>
<input type="number" id="pair_2_num_2">

<div>
<label for="number 2">Result : </label>
<span id="result2"></span>
</div>
</div>

<br>

<div>
<u><h3>Pair 3</h43></u><br><br>
<label for="number 1">Number 1</label>
<input type="number" id="pair_3_num_1">

<label for="number 2">Number 1</label>
<input type="number" id="pair_3_num_2">

<div>
<label for="number 3">Result : </label>
<span id="result3"></span>
</div>
</div>

<br>

<div>
<u><h3>Pair 4</h43></u><br><br>
<label for="number 1">Number 1</label>
<input type="number" id="pair_4_num_1">

<label for="number 2">Number 1</label>
<input type="number" id="pair_4_num_2">

<div>
<label for="number 4">Result : </label>
<span id="result4"></span>
</div>
</div>

<button id="calculate" onclick="calculatePrime()">Calculate</button>
<br>
</body>
<script type="text/javascript">
function calculatePrime(){
var pair_1_num_1 = document.getElementById("pair_1_num_1").value;
var pair_1_num_2 = document.getElementById("pair_1_num_2").value;
var pair_2_num_1 = document.getElementById("pair_2_num_1").value;
var pair_2_num_2 = document.getElementById("pair_2_num_2").value;
var pair_3_num_1 = document.getElementById("pair_3_num_1").value;
var pair_3_num_2 = document.getElementById("pair_3_num_2").value;
var pair_4_num_1 = document.getElementById("pair_4_num_1").value;
var pair_4_num_2 = document.getElementById("pair_4_num_2").value;

var result1 = document.getElementById("result1").innerHTML = "";
var result2 = document.getElementById("result2").innerHTML = "";
var result3 = document.getElementById("result3").innerHTML = "";
var result4 = document.getElementById("result4").innerHTML = "";


if(pair_1_num_1.length != 0 && pair_1_num_2.length!=0)
executeAsyncTask(function() {
findPrimesInRange(pair_1_num_1, pair_1_num_2,document.getElementById("result1"));
});
if(pair_2_num_1.length != 0 && pair_2_num_2.length!=0)
executeAsyncTask(function() {
findPrimesInRange(pair_2_num_1, pair_2_num_2,document.getElementById("result2"));
});
if(pair_3_num_1.length != 0 && pair_3_num_2.length!=0)
executeAsyncTask(function() {
findPrimesInRange(pair_3_num_1, pair_3_num_2,document.getElementById("result3"));
});
if(pair_4_num_1.length != 0 && pair_4_num_2.length!=0)
executeAsyncTask(function() {
findPrimesInRange(pair_4_num_1, pair_4_num_2,document.getElementById("result4"));
});
}

function findPrimesInRange(a,b,resultSpan){
var i = 0;
var flag = 0;
var j = 0;
for (i = a; i <= b; i++) {
if (i == 1) {
continue;
}
flag = 1;
for (j = 2; j <= i / 2; ++j) {
if (i % j == 0) {
flag = 0;
break;
}
}
if (flag == 1) {
//alert("PrimesInRange " + i);
resultSpan.innerHTML = resultSpan.innerHTML + " " + i;
}
}
}

function executeAsyncTask(func) {
setTimeout(func, 0);
}

</script>
</html>

*****************************************************************************************************************************************

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