如何计算已选中多少个复选框 [英] How to count how many checkboxes has been checked

问题描述

当用户单击按钮时，我有一个HTML表第一列，其中包括复选框，我想在转到后面的代码之前检查是否已选中任何复选框.

这就是我所拥有的，但是它总是抛出错误 "Microsoft JScript运行时错误:语法错误，无法识别的表达式:input.checkbox:checked"]"

这是我的代码，我只想返回实际选中了多少个复选框的计数.

感谢您的帮助.

解决方案

find()函数中有一个悬挂的括号，请尝试

$('#BtnExportToExcel').click(function () {
   var check = $('#gvPerformanceResult').find('input[type=checkbox]:checked').length;
   alert(check);
   return false;
}):

请注意，根据您的回答，您似乎希望#gvPerformanceResult中的所有复选框，而不是类.checkbox的复选框-使用[type=checkbox]来选择那些复选框

I have a HTML table first column consists of check boxes etc when the user clicks a button i want to check if any of the check boxes have been checked before going to the code behind etc.

This is what i have but it keeps throwing an error "Microsoft JScript runtime error: Syntax error, unrecognized expression: input.checkbox:checked"]"

This is my code i just want to return the count of how many checkboxes are actually checked.

   $('#BtnExportToExcel').click(function () {
          var check = ('#gvPerformanceResult').find('input.checkbox:checked"]').length;
          alert(check);
    return false;
    }):

Thanks for your help.

解决方案

You have a dangling bracket in the find() function, try this

$('#BtnExportToExcel').click(function () {
   var check = $('#gvPerformanceResult').find('input[type=checkbox]:checked').length;
   alert(check);
   return false;
}):

Note, based on your answer it seems you want ALL checkboxes within #gvPerformanceResult and not checkboxes with the class .checkbox - use [type=checkbox] to select those checkboxes

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