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Javascript event bubble demo

Source: Internet
Author: User
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  1. <! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en"
  2. Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd>
  3. <HTML xmlns = "http://www.w3.org/1999/xhtml" lang = "ZH" XML: lang = "ZH">
  4. <Head>
  5. <Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
  6. <Meta name = "Developer" content = "realazy"/>
  7. <Title> bubble in Javascript DOM </title>
  8. <Style type = "text/CSS" Media = "screen">
  9. Div * {display: block; margin: 4px; padding: 4px; Border: 1px solid white ;}
  10. Textarea {width: 20em; Height: 2em ;}
  11. </Style>
  12. <SCRIPT type = "text/JavaScript">
  13. // <! [CDATA [
  14. Function Init (){
  15. VaR log = Document. getelementsbytagname ('textarea ') [0];
  16. VaR all = Document. getelementsbytagname ('div ') [0]. getelementsbytagname ('*');
  17. For (VAR I = 0, n = all. length; I <n; ++ I ){
  18. All [I]. onmouseover = function (e ){
  19. This. style. Border = '1px solid red ';
  21. Log. value = 'the cursor enters: '+ this. nodename;
  22. };
  23. All [I]. onmouseout = function (e ){
  24. This. style. Border = '1px solid white ';
  25. };
  26. }
  28. VaR all2 = Document. getelementsbytagname ('div ') [1]. getelementsbytagname ('*');
  29. For (VAR I = 0, n = all2.length; I <n; ++ I ){
  30. All2 [I]. onmouseover = function (e ){
  31. This. style. Border = '1px solid red ';
  33. If (e) // stop event bubbling
  34. E. stoppropagation ();
  35. Else
  36. Window. event. cancelbubble = true;
  38. Log. value = 'the cursor enters: '+ this. nodename;
  39. };
  40. All2 [I]. onmouseout = function (e ){
  41. This. style. Border = '1px solid white ';
  42. };
  43. }
  44. }
  45. Window. onload = Init;
  46. //]>
  47. </SCRIPT>
  48. </Head>
  49. <Body>
  50. <H1> bubble in Javascript DOM
  51. <P> the DOM tree structure is: </P>
  52. <PRE> <code>
  53. Ul
  54. -Li
  55. -
  56. -Span
  57. </Code> </PRE>
  58. <Div>
  59. <Ul>
  60. <Li> <a href = "#"> <span> bubbllllllllllllllle </span> </a> </LI>
  61. <Li> <a href = "#"> <span> bubbllllllllllllllle </span> </a> </LI>
  62. </Ul>
  63. </Div>
  64. <Textarea> </textarea>
  65. <P> move the cursor to any sub-element of UL. If the bubble is not stopped, the <code> Mouseover </code> event is defined from ul to span, this event will rise to ul, so that the elements entering the mouse will have a red edge to the UL element. </P>
  66. <Div>
  67. <Ul>
  68. <Li> <a href = "#"> <span> bubbllllllllllllllle </span> </a> </LI>
  69. <Li> <a href = "#"> <span> bubbllllllllllllllle </span> </a> </LI>
  70. </Ul>
  71. </Div>
  72. <P> if you stop bubbling and the event does not rise, you can obtain the precise mouse entry element. </P>
  73. </Body>
  74. </Html>

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