js如何判断checkbox是否被选中,js中怎么判断check有没有被选中
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1,js 中 怎么判断check有没有被选中
document.queryselectorall("input[type=checkbox]:checked").length==02,用js如何判断checkbox是否选中
if(document.getElementById("checkboxID").checked){
alert("checkbox is checked");
}var flag = $("#pcheck").attr("checked"); if(flag){选中}3,js判断checkbox是否选中
if(document.getElementById("checkboxID").checked){
alert("checkbox is checked");
}js判断checkbox是否选中
var $id = document.getelementbyid("id");
alert($id.checked);DOM元素的checked属性true选中false没选中用jquery吗?$("#item").is(":checked")4,js怎样判断多个checkbox被选中
这就要求判断多个checkbox是否同时选中。在jsp中判断的代码,已在上一篇中写到。在这里看一下javascript的代码。
在判断的时候我先用了以下代码:
function EditForm(){var m=0;flag=false;
for(i=0;i<frmList.userid.length;i++){if(frmList.userid[i].checked){flag=true;m++;}}if(!flag){alert(你没有选中任何数据);return ;}if(m1){alert(你选择了多条更新数据!);return;}document.frmList.action=modify_dbuserinfo.jsp;
document.frmList.submit();}但另外一种情况出现了,在只有一个checkbox的情况下又不能正常运行。后来给表单上加一个同名的隐藏域。只要出现checkbox时就让他是数组。顺利解决。大家也可以试一下其它的方法。
5,js如何判断checkbox是否被选中
如果被选中则可以提交,没有选中弹出提示框,不能提交。
基本
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- 请求信息 : 2026-05-21 11:04:51 HTTP/1.1 GET : /article/ejihpc.html
- 运行时间 : 0.9481s ( Load:0.0065s Init:0.2178s Exec:0.7145s Template:0.0093s )
- 吞吐率 : 1.05req/s
- 内存开销 : 2,223.45 kb
- 查询信息 : 12 queries 5 writes
- 文件加载 : 36
- 缓存信息 : 0 gets 0 writes
- 配置加载 : 130
- 会话信息 : SESSION_ID=6furguf7vtpuh8gjb993hlpo30
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- /www/wwwroot/tsicrk.com/ThinkPHP/ThinkPHP.php ( 4.61 KB )
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- [ app_init ] --START--
- Run Behavior\BuildLiteBehavior [ RunTime:0.000004s ]
- [ app_init ] --END-- [ RunTime:0.000032s ]
- [ app_begin ] --START--
- Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000302s ]
- [ app_begin ] --END-- [ RunTime:0.000325s ]
- [ view_parse ] --START--
- [ template_filter ] --START--
- Run Behavior\ContentReplaceBehavior [ RunTime:0.000074s ]
- [ template_filter ] --END-- [ RunTime:0.000095s ]
- Run Behavior\ParseTemplateBehavior [ RunTime:0.006409s ]
- [ view_parse ] --END-- [ RunTime:0.006438s ]
- [ view_filter ] --START--
- Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000160s ]
- [ view_filter ] --END-- [ RunTime:0.000175s ]
- [ app_end ] --START--
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
[ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
[ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
[ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= )
- [8] Undefined index: pid /www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php 第 47 行.
- [8] Undefined index: db_host /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 120 行.
- [8] Undefined index: db_port /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 121 行.
- [8] Undefined index: db_name /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 122 行.

0.9481s
