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Top 24 Google Charts Interview Questions

Q1. What Data Sources Can I Access Using The Visualization Api?

With the Visualization API you can access information locally from your browser by way of developing the API's trendy DataTable layout, or get right of entry to any facts source that helps the API. Well-acknowledged programs that already assist the API are Google Spreadsheets and Salesforce.Com on their Force.Com developer platform. You may additionally put in force your very own records as a Chart facts supply.

Q2. Is The Google Visualization Api Available For Commercial Use?

Yes.

Q3. Is It Safe To Embed A Chart In My Web Site?

Running third party code at once on your net website online poses inherent dangers. Google makes no guarantees or representations about software performance, best, safety, or content. Chart applications that don't observe the Google Visualization API Terms of Service may be eliminated from the galleries.

Q4. Why Are My Months And Days Off By One?

Google Charts makes use of JavaScript, which uses zero-based indexing. The first day of the month is zero, and the months variety from zero (January) to eleven (December). If your code assumes one-based indexing, subtract one before putting the your facts right into a JavaScript date object.

Q5. What Is The Google Visualization Program Policy?

As defined inside the Terms of Service, we might also decline to consist of and show content material that violates our software coverage by using showing or linking to:

Illegal content.

Invasions of personal privateness.

Pornography or obscenity.

Content, consisting of malicious code, that interferes with or is dangerous to a person's laptop or the functioning of the host internet page.

Promotions of hate or incitement of violence.

Violations of copyright.

Violations of trademark.

Impersonations of third parties.

Developers that create charts that gather statistics, comply with preserve and link to a legally ok privacy coverage. Additionally, we require builders to ensure that their chart is at ease, and to maintain their application as long as it is living within the chart listing.

These guidelines can be revised on occasion with out note.

Q6. What Can I Do With The Visualization Api?

With the Google Visualization API, you may get entry to dependent statistics--created locally to your browser or retrieved from supported records resources in a simple tabular layout. You also can put into effect your personal statistics supply as Visualization API facts supply and permit any Visualization-compliant visualization and/or application to get admission to your data. The format is amenable to use through reporting, analysis or chart packages. You can for this reason visualize the statistics and/or upload new capability to packages, inclusive of Google Spreadsheets.

Q7. What Is A Data Source Url?

A Data Source URL is the precise URL identifier of a Visualization API data source. A facts source URL might also include Chart Query Language parameters. In this case a query (together with sorting, grouping, and so forth) is achieved on the records supply previous to fetching the records.

Q8. My Application Expects The Data It Receives To Be In A Specific Format. How Do I Handle Exceptions?

You can use the getNumberOfColumns() and getColumnType() strategies of sophistication google.Visualization.DataTable to check that the facts you get suits what you assume, and trouble an errors message for mismatches.

Q9. Can I Access A Chart From A Java Application?

Yes. The Google Visualization Library for the Google Web Toolkit (GWT) lets in you to access the API compliant visualizations from Java code compiled with the GWT compiler and to put in writing Visualization API compliant visualizations in Java using the GWT complier. The launch candidate library additionally helps the Visualization API event version.

Q10. Can I Access A Chart From An Application Written With The Google Web Toolkit (gwt) Compiler?

Yes. The Google Visualization Library for the Google Web Toolkit (GWT) allows you to access the API compliant visualizations from Java code compiled with the GWT compiler and to write down Visualization API compliant visualizations in Java using the GWT complier. The launch candidate library additionally supports the Visualization API occasion version.

Q11. Why Don't My Bars/lines/etc Line Up With The Correct Value On The Y-axis?

By default, both axes display various zero to @This is irrespective of the facts values. If you need the road, bar, or something to align with the real data cost, you have to specify a label variety that suits the records range precisely the usage of the chxr parameter.

Q12. Can I Use Charts Offline?

Your users' computers have to have get admission to to https://www.Gstatic.Com/charts/loader.Js as a way to use the interactive features of Google Charts. This is due to the fact the visualization libraries that your web page calls for are loaded dynamically before you use them. The code for loading the appropriate library is part of the protected script, and is referred to as whilst you invoke the google.Charts.Load() method. Our terms of provider do now not allow you to download the google.Charts.Load or google.Visualization code to apply offline.

Q13. Is There A Limit On The Url Length For The Google Chart Api? What Is The Maximum Url Length?

The maximum period of a URL isn't always determined with the aid of the Google Chart API, but instead via internet browser and net server issues. The longest URL that Google accepts in a chart GET request is 2048 characters in duration, after URL-encoding (e.G., becomes %7C). For POST, this limit is 16K.

If URL duration is a trouble, right here are some tips for shortening your URL:

If you're the use of a textual content encoding information layout, do away with leading zeros from numbers, put off trailing zeros after decimal points, and round or truncate the numbers after decimal factors.

If that does not shorten the URL sufficient, use simple (1 individual) or extended (2 man or woman) encoding.

Sample data much less often; i.E., reduce granularity.

Remove accoutrements and decorations, inclusive of colorings, labels, and styles, from your chart.

Q14. Why Do My Charts Work In Some Browsers But Not All?

We recommend caniuse.Com for a trove of information approximately browser incompatibilities. With Google Charts, there are now and again issues in Internet Explorer 8 and earlier, for 2 reasons:

IE8 would not aid SVG, so Charts fails over into VML, which is extra constrained.

IE8's JavaScript does not permit trailing commas in lists.

Q15. Why Is Google Offering This Service? What's In It For Me?

We built the service at the start as an internal device to guide rapid embedding of charts within our own packages (like Google Finance as an example). We figured it'd be a useful tool to open up to internet builders.

Q16. What Is The Google Visualization Api?

The Google Visualization API lets in you to create charts and reporting packages over based information and facilitates integrate those directly into your internet site.

Q17. How Can I Promote My Chart Data Source?

Post your implementation on the Visualization Group. If we adore it, we might even point out it ourselves.

Q18. What Is The Difference Between The Google Chart Api And The Google Visualization Api?

The Chart API offers a easy way to create image charts of various kinds by way of sending a formatted URL that includes both the statistics and chart configuration alternatives to a Google server. The Chart API includes a closed set of charts with numerous options. The Chart API datasets are confined to the size of a URL (more or less 2K).

The Visualization API offers a manner to connect charts and information assets over the web and to submit them:

The Visualization API affords a Javascript API to get admission to charts.

Its gallery of charts includes Google-created charts, however is likewise open to any 1/3 birthday party to create their very own Visualization API-compliant visualizations.

Visualization API charts and charts can be some thing that can be rendered by using a browser. This includes pix, Javascript, vector-pix, Flash, and so forth.

A massive quantity of Chart API charts are reachable via the Visualization API, even though some of their configuration alternatives won't be available.

The API additionally provides a documented twine protocol and a manner for all people to expose their facts assets to any of the APIs visualizations.

The API has a defined occasion version that allows charts to throw and acquire activities and for that reason communicate with their host web page and/or different charts on the web page.

Q19. Violations Of The Program Policies?

Violations of those Program Policies can result in the disabling or elimination of your chart, being blacklisted from importing future charts, termination of your Google accounts and/or deletion of all your charts.

Q20. What Is The Chart Gallery?

The Chart Gallery is a list of programs that use the Visualization API. It offers a central area for the Visualization developer network to proportion Chart packages.

Q21. Can A Flash Application Access The Visualization Api?

Absolutely. The Visualization API uses a JavaScript API, however there are libraries that enable Flash apps to connect with Javascript code.

Q22. Why Doesn't My Chart Appear?

First, take a look at your JavaScript console. On Chrome, you may get right of entry to the JavaScript console through Chrome->View->Developer->JavaScript Console, or Chrome->Tools->JavaScript Console. All cutting-edge browsers have a JavaScript console; you may want to poke round menus with names like "Advanced" or "Developer Tools" to locate it.

Hopefully, the console leads you at once to the trouble. Sometimes, but, it will be hard to trlate the console message to the underlying motive. Here are a few common pitfalls:

You may be using the Google Loader incorrectly.

Only load the charts/loader.Js once. No depend how many charts you have on your web web page, you must have one and most effective one call like this:

This may be inside the head or the frame of your web page, depending on whilst you want the weight to arise.

Ideally, name google.Charts.Load most effective once, with all of the packages you will want for your net web page.

google.Charts.Load("current", programs: ["corechart", "timeline"]);

google.Charts.SetOnLoadCallback(drawBarChart1);

feature drawBarChart1()

...

Var barChart1 = new google.Visualization.BarChart(record.GetElementById('chart1'));

...

Google.Charts.SetOnLoadCallback(drawBarChart2);

characteristic drawBarChart2()

...

Var barChart2 = new google.Visualization.BarChart(record.GetElementById('chart2'));

...

Google.Charts.SetOnLoadCallback(drawTimeline);

characteristic drawTimeline()

...

Var timeline = new google.Visualization.Timeline(record.GetElementById('chart3'));

...

</script>

...

...

Every chart have to have a unique detail identification (e.G., chart1, chart2 in the above example).

Look for typos. Remember that JavaScript is a case-touchy language.

Q23. Is Google Logging All My Chart Data?

The chart records included in the HTTP request is stored in temporary logs for not than two weeks for internal trying out and debugging functions. Of course you have to remember the fact that if your chart seems in an photograph tag on a public webpage, it may be crawled.

Q24. What Is The Google Chart Api?

The Google Chart API is an exceptionally simple tool that lets you without difficulty create a chart from some statistics and embed it in a webpage. You embed the facts and formatting parameters in an HTTP request, and Google returns a PNG image of the chart. Many sorts of chart are supported, and by way of making the request into an picture tag you can surely include the chart in a website.