jQuery 如何计算选中了多少个复选框
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How to count how many checkboxes has been checked
提问by Code Ratchet
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.
我有一个 HTML 表格，第一列由复选框等组成，当用户单击一个按钮时，我想在转到后面的代码等之前检查是否已选中任何复选框。
This is what i have but it keeps throwing an error "Microsoft JScript runtime error: Syntax error, unrecognized expression: input.checkbox:checked"]"
这就是我所拥有的，但它不断抛出错误“Microsoft JScript 运行时错误：语法错误，无法识别的表达式：input.checkbox:checked”]”
This is my code i just want to return the count of how many checkboxes are actually checked.
这是我的代码，我只想返回实际选中的复选框数。
$('#BtnExportToExcel').click(function () {
var check = ('#gvPerformanceResult').find('input.checkbox:checked"]').length;
alert(check);
return false;
}):
$('#BtnExportToExcel').click(function () {
var check = ('#gvPerformanceResult').find('input.checkbox:checked"]').length;
alert(check);
return false;
}):
Thanks for your help.
谢谢你的帮助。
回答by Curt
You have invalid syntax (No $at the start, and "]at the end).
您的语法无效（$开头和"]结尾均为否）。
Change:
改变：
('#gvPerformanceResult').find('input.checkbox:checked"]').length;
To:
到：
$('#gvPerformanceResult').find('input.checkbox:checked').length;
回答by Chris
You have a dangling bracket in the find()function, try this
你在find()函数中有一个悬空括号，试试这个
$('#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 #gvPerformanceResultand not checkboxes with the class .checkbox- use [type=checkbox]to select those checkboxes
请注意，根据您的回答，您似乎希望所有复选框都在类中，#gvPerformanceResult而不是类中的复选框.checkbox- 用于[type=checkbox]选择这些复选框
回答by Andrea Turri
$('input[type="checkbox"]:checked').length;
This will return the number of checked checkbox.
这将返回选中复选框的数量。
Restrict:
严格：
$('#gvPerformanceResult').find('input[type="checkbox"]:checked').length;
回答by Code Ratchet
Figured it out
弄清楚了
$('#BtnExportToExcel').click(function () {
var check = $("input:checkbox:checked").length
alert(check);
});
$('#BtnExportToExcel').click(function () {
var check = $("input:checkbox:checked").length
alert(check);
});
