JsFormValidation/addbooks.html at master · dmpire/JsFormValidation · GitHub

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<!DOCTYPE html>
<html>
<head>
	<title>Add Books</title>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width initial-scale=1">
	<link rel="stylesheet" type="text/css" href="assets/css/bootstrap.min.css">
	<link rel="stylesheet" type="text/css" href="assets/css/font-awesome.min.css">
	<link rel="stylesheet" type="text/css" href="assets/css/style.css">
	<script type="text/javascript" src="assets/js/jquery-3.1.1.slim.min.js"></script>
	<script type="text/javascript" src="assets/js/bootstrap.min.js"></script>
</head>
<body>

	<div class="container-fluid">
	 	<div class="row col-md-6">
			<form id="form" name="form">
				<label class="labels">Title of Book:</label><br>
					<input type="text" name="title" class="input-lg input-box" maxlength="30" ><br>
				<label class="labels">Author of Book:</label><br>
					<input type="text" name="author" class="input-lg input-box" maxlength="30" ><br>
				<label class="labels">Year of Publication:</label><br>
					<input type="text" name="year" class="input-lg input-box" size="4"><br>
				<label class="labels">ISBN:</label><br>
					<input type="text" name="isbn" class="input-lg input-box" maxlength="13"><br>
				<input type="button" class="btn btn-danger input-box" onclick="validateForm();" id="button" value="Submit">
			</form>
		</div>
	</div>


	<script type="text/javascript">
	//This next step is made possible because the inputs all have the name="" attribute.
		var title = document.form.title;
		var author = document.form.author;
		var year = document.form.year;
		var isbn = document.form.isbn;

	//This is the function that ultimately validates the form.
		function validateForm(){
			//Just another way of saying if all the funtions listed within the parenthesis are true, then the following should be alerted.
			if (title_validation() && author_validation() && year_validation() &&  isbn_validation()) {

				alert("Book Title: "+ title.value + ". Author : " + author.value + ". Published in : " + year.value +". The ISBN number is " + isbn.value + ".");
			} else {
				return false;
			}


		}

		//The preceding function validates the title input. Making sure it's not empty.
		function title_validation(){
			var title_val = title.value;
			if(title_val == 0 || title_val == ''){
				alert("Please, put in the book\'s title.");
				return false;
			}
			return true;
		}

		//The preceding function validates the author input.
		function author_validation(){
			var author_val = author.value;
			if(author_val == 0){
				alert("Who wrote the book?");
				return false;
			}
			return true;
		}

		//The preceding function validates the year input.
		function year_validation(year_val){
			var year_val = year.value;
			if(year_val == 0 || year_val < 1600 || year_val > 2017){
				alert("Enter a valid year of Publish, Please.");
				return false;
			}
			return true;
		}

		function isbn_validation(){
			var numbers = /^[0-9]+$/;  //This specifies that only digits from 0 - 9 may be entered.
			var isbn_val = isbn.value;
			if(isbn_val.match(numbers)){
				return true;
			} else
				{
				alert("Please enter digits.");
				return false;
			}
		}

	</script>

</body>
</html>