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"d3.js starter series---1" First program HelloWorld

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Author: User
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Now let's start with d3.js to deal with the first simple question, and look at the following code:

[html]View PlainCopy
  2. <html>
  4. <head>
  6. <meta charset="utf-8">
  8. <title>helloworld</title>
  10. </head>
  12. <body>
  14. <P>hello World 1</P>
  16. <p>hello World 2</P>
  18. </Body>
  20. </html>

If you have studied html, you should know that two lines of text will be printed on the screen, such as:

What if you want to use JavaScript to change these two lines of text? We will add the code into: [html]View PlainCopy
  2. <html>
  4. <head>
  6. <meta charset="utf-8">
  8. <title>helloworld</title>
  10. </head>
  12. <body>
  14. <P>hello World 1</P>
  16. <p>hello World 2</P>
  18. <script>
  20. var paragraphs = document.getElementsByTagName ("p");
  22. For (var i = 0; i < paragraphs.length; I++) {
  24. var paragraph = Paragraphs.item (i);
  26. paragraph.innerhtml = "I like dog.";
  28. }
  30. </Script>
  32. </Body>
  34. </html>

The result becomes:


As you can see, using javascript, we've added 4 lines of code, What if we use d3.js? Just add one line of Code. Be careful not to forget to refer to the D3.js source File.

[html]View PlainCopy
  2. <html>
  4. <head>
  6. <meta charset="utf-8">
  8. <title>helloworld</title>
  10. </head>
  12. <body>
  14. <P>hello World 1</P>
  16. <p>hello World 2</P>
  18. <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></ Script>
  20. <script>
  22. D3.select ("body"). selectall ("p"). text ("www.ourd3js.com");
  24. </Script>
  26. </Body>
  28. </html>

The results will change to:


Similar to JavaScript like jquery, it simplifies the process of using Javascript.

Next change the font color and size, as Follows:

[html]View PlainCopy
    1. var p = d3.select ("body"). selectall ("p"). text ("www.ourd3js.com");
    2. P.style ("color", "red");
    3. P.style ("font-size", "72px");

You can see that the above code assigns a value to the variable p before using P. This will make the code cleaner.

From: blog home: http://www.ourd3js.com/, csdn blog Home for: http://blog.csdn.net/lzhlzz/. Reprint Please indicate the source, thank you.

"d3.js starter series---1" First program HelloWorld

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