使用for循环在document.getelementbyid中填充数组

Question

i now facing a problem with using looping on my project. Currently i have a multiple checkbox which have their own unique id example :myCheckbox,myCheckBox1,myCheckBox2,....

I don't wish to hardcore the number behind the myCheckBox, so i try to use a for loop to get it done. Somehow i dono why my for loop does work, if i hardcode it like document.getelementbyid('mycheckbox1').checked==true then it work.

Anything i miss out in my code? Please guide me through as i'm still new to web programming. Thanks

Here is my code:

<script type='text/javascript'>

        function checkDisabled(yourSubmitButton){

          for(var i=0;i<10;i++){
              if(document.getElementById("myCheckBox"+i).checked==true){
                  yourSubmitButton.disabled = false;
                    return; 
              }
          } 


            // If we have made it here, disable it
            yourSubmitButton.disabled = true;

          };
          </script> 

Answer 1

在黑暗中myCheckbox ：您在问题中说过，您的复选框称为myCheckbox ， myCheckbox1 ， myCheckBox2等，但是您的循环在第一次迭代时正在寻找myCheckbox0 ，而不是myCheckbox ，这将使其在发生异常时抛出异常您尝试读取null的checked属性。