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index.html
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<html>
<head>
<!--Load the AJAX API-->
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.load('visualization', '1.0', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
// Callback that creates and populates a data table,
// instantiates the pie chart, passes in the data and
// draws it.
function drawChart() {
// Create the data table.
var data = new google.visualization.DataTable();
data.addColumn('string', 'Topping');
data.addColumn('number', 'Slices');
data.addRows([
['Mushrooms', 3],
['Onions', 1],
['Olives', 1],
['Zucchini', 1],
['Pepperoni', 2]
]);
// Set chart options
var options = {'title':'How Much Pizza I Ate Last Night',
'width':400,
'height':300};
// Instantiate and draw our chart, passing in some options.
var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<!--Div that will hold the pie chart-->
<div id="chart_div"></div>
<div id="userInput">
Pizza! : <input id="mushroomsBox" class="mushrooms" type="textbox" placeholder="Enter how many slices of mushroom you will eat"></input>
<button id="submit">Submit</button>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#mushroomsBox').keypress(function(e){
if(e.keyCode==13)
$('#submit').click();
});
});
$("button#submit").click(function() {
var inp = $('#mushroomsBox').val();
var numberRegex = /^[+-]?\d+(\.\d+)?([eE][+-]?\d+)?$/;
if(jQuery.trim(inp).length == 0) {
var errMsgBlank
errMsgBlank = "Cannot be blank. Please enter a number.";
alert(errMsgBlank);
}
else if(!(numberRegex.test(inp))) {
var errMsgNum
errMsgNum = "Must be a number. Please enter a number.";
alert(errMsgNum);
}
else if((jQuery.trim(inp).length > 0) && (numberRegex.test(inp))) {
var data = new google.visualization.DataTable();
data.addColumn('string', 'Topping');
data.addColumn('number', 'Slices');
data.addRows([
['Mushrooms', parseInt($(".mushrooms").val())],
['Onions', 1],
['Olives', 1],
['Zucchini', 1],
['Pepperoni', 2]
]);
var options = {'title':'How Much Pizza I Ate Last Night',
'width':400,
'height':300};
var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
$('#mushroomsBox').val('');
});
</script>
</body>
</html>