Adobe Flex Authors: Matthew Lobas, PR.com Newswire, Shelly Palmer, Kevin Benedict

Related Topics: Java IoT, Adobe Flex, Machine Learning , Silverlight

Java IoT: Blog Feed Post

Calling Client Side JavaScript from a BIRT Chart

BIRT Text element that contains script which executes within the client browser and contains functions

JavaScript Track at Cloud Expo

A couple of months ago I detailed a new feature for BIRT charts that allows multiple hyperlinks to be attached to one the supported events.

That post is available here.

In this post I will discuss using a BIRT Text element that contains script which executes within the client browser and contains functions that are called from rendered charts.

General Information
BIRT currently supports interactivity on many chart components like chart series, title, axis, and the legend. The components that support interactivity will depend on the type of chart being used. The events are client based events like mouse click, mouse over, key down, etc. Multiple events can be hooked and each is associated with an action. Actions define the behavior that should occur when a specific event happens. The actions available depend on what component the action is defined for and what chart output type is being used. Currently BIRT supports the following Actions.

Hyperlink – Supports multiple hyperlinks, drill through, and linking to bookmarks.
Show Toolip – Supports displaying tooltips. Data available for use in the tooltip will depend on the component.
Highlight – Highlights the selected component. Most often used to highlight specific series or data point.
Toggle Visibility – Toggles the visibility of the selected component. Most often used to change the visibility of a series or data point.
Toggle DataPoint Visibility – Toggles the data point label visibility.
Invoke Script – Invokes client side script.

Additionally if you are using the Chart engine within an SWT, SVG, or Swing based application the engine supports adding a callback action that your code can use to interpret chart events.

Highlight, Toggle Visibility, and Toggle DataPoint Visibility actions are only available when using an SVG output setting.

If you use SVG, and you wish to test the report in the designer remember to set the Enable SVG chart in the Preview preferences for the Report Design Preference entry.

More information on Chart Interactivity is available here. Also see the Chart FAQ for more details.

InvokeScript Example
The follow section details an example of using the invokeScript action on multiple Chart events.

Assume that you have a Chart that displays a set of customers with a series value for each equal to the customer's credit limit.

Suppose you want to display the customer details right below the chart when the mouse is moved over a specific data point. This can be done using the invokeScript action on the mouse over event for the chart series. To do this first create a table below the chart that is bound to the same dataset that the chart is using. You can then nest a table that calls another data set to retrieve customer information. In the attached example this will be the ChartData and CustomerInformation datasets respectively.

By default this will generate a inner table that contains customer information for every customer represented in the chart. Obviously you do not want to display all of these at once, so create a new style in the style editor with only one property overridden – Text Block:Display set to no Display. Apply this new style to both the inner and outer tables.

If you run the report after completing this step all the tables will be generated in the output but none will be displayed. This is different than using the visibility property which will not put the tables in the output. Enter the following bookmarks for the outer and inner tables.

Outer table bookmark expression: "myoutertable";
Inner table bookmark expression: "mytable"+row["CUSTOMERNUMBER"]

This will assign the outer table id to myoutertable and a unique id for each inner table starting with mytable and the customer number for the given inner table appended to it. We can now use these with some client script to turn them on or off.

Add a Text element below the two tables with the following value.

function clearSel(){
var ot=document.getElementById("myoutertable");
var intbls=ot.getElementsByTagName("TABLE");
for( jj=0; jj<intbls.length; jj++ ){
intbls[jj].style.display = "none";
function DisplayCustomer(cat) {


Make sure to set the Text type to HTML.

The clearSel function first finds the outer table and then locates every nested table and sets the display style for each to none. The outer table’s display style is also set to none. This will effectively hide both tables.

The DisplayCustomer function first clears all current displayed tables. Next it uses a category passed in from the Chart to find the specific customer inner table and sets its display style to block. It also sets the outer table to be visible.

To link these two functions to the Chart use the Interactivity button on the Value (Y) Series as shown in the picture below. Note that we use a mouse over event to call the DisplayCustomer function and a mouse click function to clear the tables.

This produces the following output.

As the mouse is moved over the different tubes the table below the chart will update. To clear the tables click on one of the tubes. You will notice that we passed categoryData to the DisplayCustomer JavaScript function. This is a predefined variable available to the invokeScript function that contains the category value for a specific datapoint. The example report lists the predefined variables and in what action they are available using label elements at the top of the report. These labels are hidden at run time.

The example is available at BIRT Exchange.

Read the original blog entry...

More Stories By Jason Weathersby

Jason Weathersby is a member of the extended BIRT development team at Actuate Corporation and has backgrounds in both computer science and technical writing. He has many years experience in technical consulting, training, writing, and publishing about reporting, business intelligence tools, and database technologies.

IoT & Smart Cities Stories
Dynatrace is an application performance management software company with products for the information technology departments and digital business owners of medium and large businesses. Building the Future of Monitoring with Artificial Intelligence. Today we can collect lots and lots of performance data. We build beautiful dashboards and even have fancy query languages to access and transform the data. Still performance data is a secret language only a couple of people understand. The more busine...
DXWorldEXPO LLC announced today that Big Data Federation to Exhibit at the 22nd International CloudEXPO, colocated with DevOpsSUMMIT and DXWorldEXPO, November 12-13, 2018 in New York City. Big Data Federation, Inc. develops and applies artificial intelligence to predict financial and economic events that matter. The company uncovers patterns and precise drivers of performance and outcomes with the aid of machine-learning algorithms, big data, and fundamental analysis. Their products are deployed...
All in Mobile is a place where we continually maximize their impact by fostering understanding, empathy, insights, creativity and joy. They believe that a truly useful and desirable mobile app doesn't need the brightest idea or the most advanced technology. A great product begins with understanding people. It's easy to think that customers will love your app, but can you justify it? They make sure your final app is something that users truly want and need. The only way to do this is by ...
The challenges of aggregating data from consumer-oriented devices, such as wearable technologies and smart thermostats, are fairly well-understood. However, there are a new set of challenges for IoT devices that generate megabytes or gigabytes of data per second. Certainly, the infrastructure will have to change, as those volumes of data will likely overwhelm the available bandwidth for aggregating the data into a central repository. Ochandarena discusses a whole new way to think about your next...
CloudEXPO | DevOpsSUMMIT | DXWorldEXPO are the world's most influential, independent events where Cloud Computing was coined and where technology buyers and vendors meet to experience and discuss the big picture of Digital Transformation and all of the strategies, tactics, and tools they need to realize their goals. Sponsors of DXWorldEXPO | CloudEXPO benefit from unmatched branding, profile building and lead generation opportunities.
Digital Transformation and Disruption, Amazon Style - What You Can Learn. Chris Kocher is a co-founder of Grey Heron, a management and strategic marketing consulting firm. He has 25+ years in both strategic and hands-on operating experience helping executives and investors build revenues and shareholder value. He has consulted with over 130 companies on innovating with new business models, product strategies and monetization. Chris has held management positions at HP and Symantec in addition to ...
Cell networks have the advantage of long-range communications, reaching an estimated 90% of the world. But cell networks such as 2G, 3G and LTE consume lots of power and were designed for connecting people. They are not optimized for low- or battery-powered devices or for IoT applications with infrequently transmitted data. Cell IoT modules that support narrow-band IoT and 4G cell networks will enable cell connectivity, device management, and app enablement for low-power wide-area network IoT. B...
The hierarchical architecture that distributes "compute" within the network specially at the edge can enable new services by harnessing emerging technologies. But Edge-Compute comes at increased cost that needs to be managed and potentially augmented by creative architecture solutions as there will always a catching-up with the capacity demands. Processing power in smartphones has enhanced YoY and there is increasingly spare compute capacity that can be potentially pooled. Uber has successfully ...
SYS-CON Events announced today that CrowdReviews.com has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5–7, 2018, at the Javits Center in New York City, NY. CrowdReviews.com is a transparent online platform for determining which products and services are the best based on the opinion of the crowd. The crowd consists of Internet users that have experienced products and services first-hand and have an interest in letting other potential buye...
When talking IoT we often focus on the devices, the sensors, the hardware itself. The new smart appliances, the new smart or self-driving cars (which are amalgamations of many ‘things'). When we are looking at the world of IoT, we should take a step back, look at the big picture. What value are these devices providing. IoT is not about the devices, its about the data consumed and generated. The devices are tools, mechanisms, conduits. This paper discusses the considerations when dealing with the...