Home > Developer > Web Develop

ExtJS learning path: ExtJs event (Custom Event, on, eventManager) Example

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Page code:

[Javascript]View plaincopyprint?
  1. <Body>
  2. <Link rel = "stylesheet" type = "text/css" href = ".. /.. /.. /.. /resources/css/ext-all.css "mce_href =" resources/css/ext-all.css "/>
  3. <Mce: script type = "text/javascript" src = ".. /.. /.. /.. /ext/ext-base.js "mce_src =" ext/ext-base.js "> </mce: script>
  4. <Mce: script type = "text/javascript" src = ".. /.. /.. /.. /ext/ext-all.js "mce_src =" ext/ext-all.js "> </mce: script>
  5. <Div style = "padding: 10px 10px 20px;" mce_style = "padding: 10px 10px 10px 20px;">
  6. Event examples, including user-defined events and Use of on, addListener, and EventManager.
  7. </Div>
  8. <Div id = "eventTestDiv" style = "padding: 10px 10px 20px; width: 150px; height: 50px; background-color: green;">
  9. Move the mouse over to me!
  10. </Div>
  11. <Br>
  12. <Div style = "padding: 10px 10px 20px;" mce_style = "padding: 10px 10px 10px 20px;">
  13. <Input type = "button" name = "button1" id = "button1" value = ""/>
  14. </Div>
  15. <Mce: script type = "text/javascript" src = "CustomEvent. js" mce_src = "CustomEvent. js"> </mce: script>
  16. </Body>

 

Js Code

[Javascript]View plaincopyprint?
  1. /*************************************** *
  2. * Use custom events
  3. */
  4. Var Person = function (){
  5. // Register an event. The event name is "say ".
  6. This. addEvents ("say ");
  7. // Register multiple events in another way
  8. This. addEvents ({
  9. "Run": true,
  10. "See": false
  11. });
  12. }
  13. // Event processing in Extjs can be performed only when the Ext. util. Observable class is inherited.
  14. Ext. extend (Person, Ext. util. Observable );
  16. // Define related execution methods
  17. Var speak = function (){
  18. Alert ("I can speak! ");
  19. }
  20. Var run = function (){
  21. Alert ("I can run! ");
  22. }
  23. Var see = function (){
  24. Alert ("I can see the word! ");
  25. }
  27. Var person = new Person ();
  28. // Bind the method say to the event say. The two names can be different.
  29. Person. on ("say", speak );
  30. Person. on ("run", run );
  31. Person. on ("see", see );
  33. // Trigger event. Only say and run are triggered here. The see event is not triggered.
  34. Person. fireEvent ("say ");
  35. Person. fireEvent ("run ");
  36. /*************************************** **/
  38. Ext. onReady (function (){
  39. // The returned Element object is not equivalent to document. getElementById (id)
  40. // Ext. getDom (id) is equivalent to document. getElementById (id)
  41. Var eventTestDiv = Ext. get ("eventTestDiv ");
  42. // Implemented through EventManager or obj. addListener. See the following example.
  43. Ext. EventManager. addListener (eventTestDiv, "mouseover", function (){
  44. Ext. Msg. alert ('info', 'Id: '+ this. Id +' <br> content: '+ this. innerHTML );
  45. });
  46. Ext. EventManager. addListener (eventTestDiv, "click", function (){
  47. Ext. Msg. alert ('info', 'Id: '+ this. Id
  48. + '<Br> name:' + this. name
  49. + '<Br> value:' + this. value );
  50. });
  51. /**
  52. In the example of addListener, the third parameter refers to the scope, and the fourth parameter is a configuration option.
  53. There are four configuration options:
  54. Delay {Number}: the time when the function execution is delayed after the event is triggered. (How long will the specified function be executed after the event is triggered );
  55. Scope {Object}: The scope of the event processing function execution. The context of the processing function "this. (If 3rd parameters are set, save them here );
  56. Single {Boolean}: true indicates that a processing function is added after the event is triggered. (Once an event is triggered, it will be removed and then triggered later );
  57. Buffer {Number}: If a millisecond is specified, the processing function is scheduled to be executed after Ext. util. DelayedTask is delayed. If the event is triggered again in that event, the original processor handle will not be enabled, but the new processor handle will be placed in its location.
  58. The following configurations are not used:
  59. Delegate {String}: A simple Selector Used to filter targets or find their children.
  60. StopEvent {Boolean}: true indicates that the event is blocked. That is, stop the propagation and stop the default action.
  61. PreventDefault {Boolean}: true indicates that the default action is blocked.
  62. StopPropagation {Boolean}: true indicates to prevent event propagation.
  63. Normalized {Boolean}: false indicates that the handler is sent to an original, unencapsulated browser object instead of a non-standard Ext. EventObject.
  64. */
  65. Var button1 = Ext. get ("button1 ");
  66. // AddListener is equivalent to on, and on is short for addListener.
  67. Button1.addListener ("click", function (){
  68. // Obtain the actually passed parameter values. The first two parameters are EventObject and Element, and the third parameter is the option object.
  69. Var msg = '<br/> obtain the optional parameter information: <br/> Number of optional parameters:' + arguments. length + "<br/> ";
  70. For (var I in arguments [2]) {
  71. Msg + = I + ":" + arguments [2] [I] + "<br/> ";
  72. }
  73. Ext. Msg. alert ('info', 'print eventTestDiv information: <br/> Id: '+ this. id
  74. + "<Br/>" + msg
  75. );
  76. }, EventTestDiv ,{
  77. // Event delay trigger event
  78. Delay: 500,
  79. // Whether to trigger only once
  80. Single: false,
  81. Msg: 'The append parameter'
  82. });
  83. /**
  84. Several event writing methods (addListener and on are equivalent ):
  85. Var fn = function (){
  86. // Add the logic to be processed.
  87. };
  88. // Method 1
  89. Button1.addListener ("click", fn, button1 );
  90. Button1.addListener ("mouseover", fn, button1 );
  92. // Method 2
  93. Button1.on ({
  94. Click: fn,
  95. Mouseover: fn,
  96. Scope: button1
  97. });
  99. // Method 3
  100. Button1.on ({
  101. Click :{ scope: button1, delay: 3000, fn: fn },
  102. Mouseover: {scope: button1, delay: 1000, fn: fn}
  103. });
  104. */
  105. })

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
extjs listeners example php extjs example extjs desktop example extjs file upload example event extjs php extjs timeline

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More