saurav_funcTask.html

<script>
	var data = [];
	var id = 1;
	var numReg = /^\d+$/;

	function checklen(inp, len) {
		//-------------------------------Check Length--------------------------------------
		do {
			var inputString = prompt(inp);
		} while (inputString.length < len);
		return inputString;
	}

	function checkNum(inp) {
		//-------------------------------Check Number--------------------------------------
		do {
			var num = prompt(inp);
		} while (!num.match(numReg));
		return parseInt(num);
	}

	function checkFixNum(inp, len) {
		//-------------------------Check Number with Fix Length-----------------------------------
		var numDoWhile = true;
		do {
			var fixNumber = prompt(inp);
			if (fixNumber.length == len) {
				if (fixNumber.match(numReg)) {
					return parseInt(fixNumber);
				}
			}
		} while (numDoWhile);
	}

	function insertData() {
		//-------------------------------Insert--------------------------------------
		var insertDoWhile = true;
		do {
			var userName = checklen("Enter your Name: \nEnter atleast 3 chars", 3);
			var userNumber = checkFixNum(
				"Enter your Number: \nNumber must be a 10 digit numeric",
				10
			);
			var dummy = [id++, userName, userNumber];
			data.push(dummy);

			alert("User data added successfully !!!");
			if (
				checkNum(
					"Do you still want to continue with Insert: \n1. Yes \n2. No"
				) == 2
			) {
				insertDoWhile = false;
			}
		} while (insertDoWhile);
	}

	function viewData() {
		//-------------------------------View--------------------------------------
		var outputString = "";
		for (var i = 0; i < data.length; i++) {
			outputString +=
				"User Id: " +
				data[i][0] +
				" - " +
				"User Name: " +
				data[i][1] +
				" - " +
				"User Number: " +
				data[i][2] +
				"\n";
		}
		alert(outputString);
	}

	function viewSearchData(index) {
		//-------------------------------View Search Data--------------------------------------
		alert(
			"User Id: " +
				data[index][0] +
				" - " +
				"User Name: " +
				data[index][1] +
				" - " +
				"User Number: " +
				data[index][2] +
				"\n"
		);
	}

	function idSearch(index) {
		//-------------------------------Id Search--------------------------------------
		var flag = -1;
		for (var i = 0; i < data.length; i++) {
			if (index == data[i][0]) {
				flag = i;
				break;
			}
		}
		return flag;
	}

	function searchData() {
		//-------------------------------Search--------------------------------------
		var searchDoWhile = true;

		do {
			var searchChoice = checkNum(
				"Enter your Search choice: \n1. Search by Id \n2. Search by Name"
			);
			switch (searchChoice) {
				case 1:
					//-------------------------------Search by Id--------------------------------------
					var searchId = checkNum("Enter the User id you want to search: ");
					var flag = idSearch(searchId);

					if (flag == -1) {
						alert("Invalid User Id !!!");
					} else {
						viewSearchData(flag);
					}
					break;

				case 2:
					//-------------------------------Search by Name--------------------------------------
					var searchName = checklen(
						"Enter the User Name you want to search: \nEnter atleast 3 chars",
						3
					);
					var flag = -1;
					for (var i = 0; i < data.length; i++) {
						if (searchName == data[i][1]) {
							flag = i;
							break;
						}
					}
					if (flag == -1) {
						alert("Invalid User Name !!!");
					} else {
						viewSearchData(flag);
					}
					break;
				default:
					alert("Enter appropriate Search choice !!!");
					break;
			}

			if (
				checkNum(
					"Do you still want to continue with Search: \n1. Yes \n2. No"
				) == 2
			) {
				searchDoWhile = false;
			}
		} while (searchDoWhile);
	}

	function updateData() {
		//-------------------------------Update--------------------------------------
		updateDoWhile = true;
		do {
			viewData();
			var updateChoice = checkNum(
				"What do you want to Update? : \n1. User Name \n2. User Number"
			);

			switch (updateChoice) {
				case 1:
					//-------------------------------Update Name--------------------------------------
					var updateId = checkNum("Enter the User id you want to Update: ");
					var flag = idSearch(updateId);

					if (flag == -1) {
						alert("Invalid User Id !!!");
					} else {
						data[flag][1] = checklen(
							"Enter new Name: \nEnter atleast 3 chars",
							3
						);
						alert("Data updated successfully !!!");
					}
					viewData();

					break;

				case 2:
					//-------------------------------Update Number--------------------------------------
					var updateId = checkNum("Enter the User id you want to Update: ");
					var flag = idSearch(updateId);

					if (flag == -1) {
						alert("Invalid User Id !!!");
					} else {
						data[flag][2] = checkFixNum(
							"Enter new Number: \nNumber must be a 10 digit numeric",
							10
						);
						alert("Data updated successfully !!!");
					}
					viewData();
					break;

				default:
					alert("Enter appropriate Update choice !!!");
					break;
			}

			if (
				checkNum(
					"Do you still want to continue with Update: \n1. Yes \n2. No"
				) == 2
			) {
				updateDoWhile = false;
			}
		} while (updateDoWhile);
	}

	function deleteData() {
		//-------------------------------Delete--------------------------------------
		deleteDoWhile = true;
		do {
			viewData();
			var deleteId = checkNum("Enter the User id you want to Delete: ");
			var flag = idSearch(deleteId);

			if (flag == -1) {
				alert("Invalid User Id !!!");
			} else {
				data.splice(flag - 1, 1);
				alert("User data deleted successfully !!!");
			}
			viewData();

			if (
				checkNum(
					"Do you still want to continue with Delete: \n1. Yes \n2. No"
				) == 2
			) {
				deleteDoWhile = false;
			}
		} while (deleteDoWhile);
	}

	//-------------------------------Main Code--------------------------------------
	var doWhile = true;
	do {
		var choice = checkNum(
			"Enter your choice: \n1. Insert \n2. View \n3. Search \n4. Update \n.5 Delete \n6. Exit"
		);

		switch (choice) {
			case 1:
				insertData();
				break;

			case 2:
				viewData();
				break;

			case 3:
				searchData();
				break;

			case 4:
				updateData();
				break;

			case 5:
				deleteData();
				break;

			case 6:
				doWhile = false;
				alert("Thank you! for visiting our system...");
				break;
		}
	} while (doWhile);
</script>