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Part 1: Creating a Chart from a Database Dynamically
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Part 1: Creating a Chart from a Database Dynamically
http://www.15seconds.com/issue/010914.htm
In this first part, we take a step-by-step approach to automatically generate a bar (or pie) chart from data stored in a database.
ASP > Tips and Tutorials > Graphs and Charts
Oct 10, 2006
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Other links at ASP > Tips and Tutorials > Graphs and Charts
The bar chart sample in asp101.com served as the basis for building this stack bar chart. A strong feature of the sample is the ability to read the values of the bars through the tool tip text. Each bar is an image inside a table data () HTML tag, that is sized to reflect its value
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Again using that great original bar chart code with a little modification, we can render a true stacked bar chart. We will use a different color for each stack and each stack will have its own tool tip too ! Just pass an array with your colors, one for each bar. The colors are specified by name, each color name has a corresponding spacer, a gif image file that is dynamically plugged into the IMG tag SRC attribute via our asp code. Make sure to place these files in your /images folder. For expanded tool tip information, pass an array with the additional text. Our example chart display five sensors (columns) with four states of alarm. (stacks). The right-hand column (bar) will represent the totals. The tool tip will first display the quantity followed by a description of what this stack on the bar represents. Note: You can embed the VbTab character to separate tool tip text into columns.
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This sample code demonstrates how to create effective graphs using simple html and the output from an access db but without the need for third party components. The example shows the stock performance for Yahoo.
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Charting is most common task you will need in data presentation. This article shows simple method to create charts without external client or server objects, without .gif, jpg or png - the chart is created as HTML, directly in page. The simpliest task is to create bar charts. HTML gives you many formatting possibilities to show bars in graph.
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To begin with, we need to create an HTML page or you could use any extension you would like. This is going to be the page the content is displayed on. Later in the article we will build a ASP page that generates the chart and is called using AJAX from the main page. I will not go into all of the details of creating a page and the entire layout, but rather focus on the items related to the chart.
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