Home > Developer > JavaScript

How to Select CheckBox using JavaScript

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

It is rare to use JavaScript to select all items in the CheckBox. This is a gift carefully prepared by the author. The code is highly authenticated and well understood. I hope it will help you.

JavaScript implements the CheckBox method to select all items:

 
 
    
  
  
  1. <Html> 
    2. 
  
  
  2. <Head> 
    3. 
  
  
  3. <Title> 
    4. 
  
  
  4.  Title> 
    5. 
  
  
  5. <Body> 
    6. 
  
  
  6. <Form Name="Form1"> 
    7. 
  
  
  7. <Input Name="Allbox" Type="Checkbox" OnClick="TA ();" Title="Select or clear all selected projects" Tabindex="105">Select or clear all selected projects
    8. 
  
  
  8. <Br/> 
    9. 
  
  
  9. <Span Class="X"> 
    10. 
  
  
  10. <Input Type="Checkbox" Name="ABC" Class="" OnClick="TTA (this );">Qingming Festival Span> 
    11. 
  
  
  11. <Br/> 
    12. 
  
  
  12. <Span Class="X"> 
    13. 
  
  
  13. <Input Type="Checkbox" Name="DEF" Class="" OnClick="TTA (this );">Changjiang Span> 
    14. 
  
  
  14. <Br/> 
    15. 
  
  
  15. <Span Class="X"> 
    16. 
  
  
  16. <Input Type="Checkbox" Name="GHL" Class="" OnClick="TTA (this );">Hey, test Span> 
    17. 
  
  
  17. <Br/> 
    18. 
  
  
  18.  Form> 
    19. 
  
  
  19. <Script Language="Javascript"> 
    20. 
  
  
  20. VarFrm=Document. Form1;
    21. 
  
  
  21.  Script> 
    22. 
  
  
  22. <Script Language="JavaScript"> 
    23. 
  
  
  23. Function TA (isO, noHL ){
    24. 
  
  
  24. VarTrk=0;
    25. 
  
  
  25. For (varI=0; I<Frm. elements. length; I ++ ){
    26. 
  
  
  26. VarE=Frm. Elements [I];
    27. 
  
  
  27. If (e. name! = 'Allbox ')&&(E. type= 'Checkbox ')){
    28. 
  
  
  28. E. checked=Frm. Allbox. checked;
    29. 
  
  
  29. If (frm. allbox. checked ){
    30. 
  
  
  30. //E. parentElement. className="H"; //. ParentElement is not compatible with firefox
    31. 
  
  
  31. E. parentNode. className="H"; // Call to set the parent node element class to change the background color
    32. 
  
  
  32. } Else {
    33. 
  
  
  33. E. parentNode. className="X"; // Call to set the parent node element class to change the background color
    34. 
  
  
  34. }
    35. 
  
  
  35. }
    36. 
  
  
  36. }
    37. 
  
  
  37. }
    38. 
  
  
  38. Function TTA (CB, noHL ){
    39. 
  
  
  39. If (CB. checked ){
    40. 
  
  
  40. CB. parentNode. className="H";
    41. 
  
  
  41. } Else {
    42. 
  
  
  42. CB. parentNode. className="X";
    43. 
  
  
  43. }
    44. 
  
  
  44. VarTB=TO= 0;
    45. 
  
  
  45. For (varI=0; I<Frm. elements. length; I ++ ){
    46. 
  
  
  46. VarE=Frm. Elements [I];
    47. 
  
  
  47. If (e. name! = 'Allbox ')&&(E. type= 'Checkbox ')){
    48. 
  
  
  48. TB ++;
    49. 
  
  
  49. If (e. checked)
    50. 
  
  
  50. TO ++;
    51. 
  
  
  51. }
    52. 
  
  
  52. }
    53. 
  
  
  53.  Frm. allbox. checked= (TO= TB )? True: false;
    54. 
  
  
  54. // If not all items are selected, allbox settings are not selected.
    55. 
  
  
  55. }
    56. 
  
  
  56.  Script> 
    57. 
  
  
  57. <Style> 
    58. 
  
  
  58. . H {
    59. 
  
  
  59. Background: # ADD8E6
    60. 
  
  
  60. }
    61. 
  
  
  61. . X {
    62. 
  
  
  62. Background: # FFFFFF
    63. 
  
  
  63. }
    64. 
  
  
  64.  Style> 
    65. 
  
  
  65.  Body> Html> 
    66.

The above is a brief introduction to the methods used to select all items in the CheckBox in JavaScript.

  1. What is JSON? Data format prepared for JavaScript
  2. 10 most commonly used JavaScript udfs
  3. Some extended thoughts on loading JavaScript events
  4. Summary of JavaScript usage: From BOM and DOM
  5. How ExtJS works on Android Simulators

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.

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.

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