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<td><h2 class="pageHeader">Using FusionCharts with VB.NET (ASP.NET) > Charting Data from Forms </h2></td>
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<td valign="top" class="text"><p>In this section, we'll show you how to use FusionCharts with ASP.NET to plot data collected in forms. </p>
<p>We'll build a simple restaurant sales example, where the user will enter the items sold by a restaurant in a given week. This data will be submitted in a form to the server. We'll acquire this data and plot in on a chart. For the sake of simplicity, we wouldn't do any processing on this data. However, your real life applications might process data before presenting it on the chart. </p>
<p><strong>Before you go further with this page, we recommend you to please see the previous section "<a href="ASP_BasicExample.html">Basic Examples</a>" as we start off from concepts explained in that page. </strong></p></td>
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<td valign="top" class="highlightBlock">The code examples contained in this page are present in<span class="codeInline"> Download Package > Code > VBNET </span> > <span class="codeInline">FormBased</span> folder. </td>
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<td valign="top" class="text"> </td>
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<td valign="top" class="header">Building the Form </td>
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<td valign="top" class="text">The form is contained in <span class="codeInline">Default.aspx</span> and looks as under: </td>
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<td valign="top" class="text"><img src="Images/Code_Form.gif" class="imageBorder" /></td>
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<td valign="top" class="text">It's a very simple form which submits to <span class="codeInline">Chart.aspx</span>. As such, we wouldn't go into the code of this form. You can directly open the source from download and see it. </td>
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<td valign="top" class="text"> </td>
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<td valign="top" class="header">Requesting the data and Creating the Chart </td>
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<td valign="top" class="text">The work of requesting the data from submitted form and creating the chart is done in <span class="codeInline">Chart.aspx</span>, present in the same folder. It contains the following code: </td>
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<td valign="top" class="codeBlock"><p><%@ Page Language="VB" AutoEventWireup="false" <br />
CodeFile="Chart.aspx.vb" Inherits="FormBased_Chart" %><br />
<HTML><br />
<HEAD><br />
<TITLE> FusionCharts Free - Form Based Data Charting Example </TITLE><br />
<%<br />
<span class="codeComment">'You need to include the following JS file, if you intend to embed the chart using JavaScript.</span><br />
%> <br />
<strong><SCRIPT LANGUAGE="Javascript" SRC="../FusionCharts/FusionCharts.js"></SCRIPT></strong><br />
</HEAD><br />
<br />
<BODY><br />
<strong><asp:Literal ID="FCLiteral" runat="server"></asp:Literal></strong><br />
</BODY><br />
</HTML></p> </td>
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<td valign="top" class="text">In the above code we have included <span class="codeInline">FusionCharts.js</span> file to enable us embed the chart using JavaScript. We are also adding an ASP control literal which acts as the container for the charts. The <span class="codeInline"><strong>CreateCharts()</strong></span> function does the generation, and is the code behind the file <span class="codeInline">Chart.aspx.vb</span>. <br />
<br />
Let's take a look at the code behind file, <span class="codeInline">Chart.aspx.vb</span> now: </td>
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<td valign="top" class="text codeBlock"><p>Imports InfoSoftGlobal<br />
</p>
<p>Partial Class FormBased_Chart<br />
Inherits System.Web.UI.Page</p>
<p> Protected Sub <b>Page_Load</b>(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load</p>
<p> <span class="codeComment">' Generate chart in Literal Control</span><br />
<b> FCLiteral.Text = CreateChart()</b></p>
<p> End Sub</p>
<p><br />
<br />
Public Function <strong>CreateChart()</strong> As String<br />
<span class="codeComment">'We first request the data from the form (Default.aspx)</span><br />
Dim intSoups As String, intSalads As String, intSandwiches As String, intBeverages As <br />
String, intDesserts As String<br />
intSoups = Context.Items("Soups")<br />
intSalads = Context.Items("Salads")<br />
intSandwiches = Context.Items("Sandwiches")<br />
intBeverages = Context.Items("Beverages")<br />
intDesserts = Context.Items("Desserts")</p>
<p> <span class="codeComment">'In this example, we're directly showing this data back on chart.<br />
'In your apps, you can do the required processing and then show the <br />
'relevant data only.</span></p>
<p> <span class="codeComment"> 'Now that we've the data in variables, we need to convert this into XML.<br />
'The simplest method to convert data into XML is using string concatenation. </span><br />
Dim strXML As String<br />
<span class="codeComment">'Initialize <graph> element</span><br />
strXML = "<graph caption='Sales by Product Category' subCaption='For this week' showPercentageInLabel='1' pieSliceDepth='25' decimalPrecision='0' showNames='1'>"<br />
<span class="codeComment"> 'Add all data</span><br />
strXML = strXML & "<set name='Soups' value='" & intSoups & "' />"<br />
strXML = strXML & "<set name='Salads' value='" & intSalads & "' />"<br />
strXML = strXML & "<set name='Sandwiches' value='" & intSandwiches & "' />"<br />
strXML = strXML & "<set name='Beverages' value='" & intBeverages & "' />"<br />
strXML = strXML & "<set name='Desserts' value='" & intDesserts & "' />"<br />
<span class="codeComment">'Close <graph> element</span><br />
strXML = strXML & "</graph>"</p>
<p> <span class="codeComment">'Create the chart - Pie 3D Chart with data from strXML</span><br />
<strong>Return FusionCharts.RenderChart("../FusionCharts/FCF_Pie3D.swf", "", strXML, "Sales", "600", "350", False, False)</strong><br />
End Function<br />
End Class<br />
</p></td>
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<td valign="top" class="text"> </td>
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<td valign="top" class="text"><p>As you can see in the above code, we're doing the following:</p>
<ul>
<li>Import <span class="codeInline">InfoSoftGlobal</span> namespace.</li>
<li>Requesting data from the submitted form and storing it in local variables.</li>
<li>Creating an XML data document using string concatenation and storing it in <span class="codeInline">strXML</span> variable. </li>
<li>Creating a Pie 3D chart using <span class="codeInline">RenderChart()</span> function and passing <span class="codeInline">strXML</span> as <span class="codeInline">dataXML</span> for the chart. <span class="codeInline">RenderChart()is called form the Page_Load</span><span class="codeInline"> event listener</span>. </li>
</ul>
<p>When you finally run the code, you'll see a chart as under: </p></td>
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<td valign="top" class="text"><img src="Images/Code_FormChart.jpg" class="imageBorder" /></td>
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