在jsp页面中,处理后台数据在复选框中回显问题

2024-11-11 12:00:37
推荐回答(5个)
回答1:

首先贴出代码片段,然后根据代码逐一说明

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    
<%@ taglib prefix="fn" uri="






Insert title here





  •     
        
    checked="checked" />
    licence_1


  •         
    checked="checked" />
    licence_2



假设复选框的name是licence,后台用info对象接收,那么回显的时候实际上就是判断info.licence是否包含当前复选项的值,这时候借助jstl fn组件中的函数contains来解决,contains用来判断参数1中是否包含字符串参数2,用法和java总的一样。这里要注意,为了能使用contains函数,需要在页头进行声明,参见代码片段第三行

关于contains的详细描述如下:

fn:contains(string, substring)

假如参数string中包含参数substring,返回true

例如:


fn还有很多其他好用的函数

1、fn:containsIgnoreCase(string, substring)

假如参数string中包含参数substring(忽略大小写),返回true

2、 fn:endsWith(string, suffix)

假如参数 string 以参数suffix结尾,返回true

3、fn:escapeXml(string)

将有非凡意义的XML (和HTML)转换为对应的XML character entity code,并返回

4、fn:indexOf(string, substring)

返回参数substring在参数string中第一次出现的位置

5、fn:join(array, separator)

将一个给定的数组array用给定的间隔符separator串在一起,组成一个新的字符串并返回。

6、fn:length(item)

返回参数item中包含元素的数量。参数Item类型是数组、collection或者String。假如是String类型,返回值是String中的字符数。

7、fn:replace(string, before, after)

返回一个String对象。用参数after字符串替换参数string中所有出现参数before字符串的地方,并返回替换后的结果

8、fn:split(string, separator)

返回一个数组,以参数separator 为分割符分割参数string,分割后的每一部分就是数组的一个元素

9、fn:startsWith(string, prefix)

假如参数string以参数prefix开头,返回true

10、fn:substring(string, begin, end)

返回参数string部分字符串,从参数begin开始到参数end位置,包括end位置的字符

11、fn:substringAfter(string, substring)

返回参数substring在参数string中后面的那一部分字符串

12、fn:substringBefore(string, substring)

返回参数substring在参数string中前面的那一部分字符串

13、fn:toLowerCase(string)

将参数string所有的字符变为小写,并将其返回

14、fn:toUpperCase(string)

将参数string所有的字符变为大写,并将其返回

15、fn:trim(string)

去除参数string 首尾的空格,并将其返回

回答2:

$(function(){

//当页面加载完成的时候,自动调用该方法

window.onload=function(){

//获得所要回显的值,此处为:100,1001,200,1400

var checkeds = $("#meidaHidden").val();

//拆分为字符串数组

var checkArray =checkeds.split(",");

//获得所有的复选框对象

var checkBoxAll = $("input[name='media']");

//获得所有复选框(新闻,微信,论坛,问答,博客,平媒)的value值,然后,用checkArray中的值和他们比较,如果有,则说明该复选框被选中

for(var i=0;i

//获取所有复选框对象的value属性,然后,用checkArray[i]和他们匹配,如果有,则说明他应被选中

$.each(checkBoxAll,function(j,checkbox){

//获取复选框的value属性

var checkValue=$(checkbox).val();

if(checkArray[i]==checkValue){

$(checkbox).attr("checked",true);

}

})

}

//全选多选框的回显

var array=$("input[name='media']:checked").length;

//如果等于6,说明全部被选中,那么全选多选框也要被选中

//如果不等于6,说明全部都没选,那么全选的多选框也要被取消

if(array==6){

$("#checkAll").attr("checked",true);

}else{

$("#checkAll").attr("checked",false);

}

};

});


回答3:

                 //获得所要回显的值,后台返回的list或者string,如果是string,split(",")转换为数组
                 var checkArray =values;
                 //获得所有的复选框对象
                 var checkBoxAll = $("input[name='media']");
                 //获得所有复选框的value值,然后,用checkArray中的值和他们比较,如果有,则说明该复选框被选中
                 for(var i=0;i                     //获取所有复选框对象的value属性,然后,用checkArray[i]和他们匹配,如果有,则说明他应被选中
                     $.each(checkBoxAll,function(j,checkbox){
                         //获取复选框的value属性
                         var checkValue=$(checkbox).val();
                         if(checkArray[i]==checkValue){
                             $(checkbox).attr("checked",true);
                         }
                     })
                 }

回答4:

$("input[name='word']").each(function(){ 
        for(数组循环){//复选框的值
        if($(this).val()==你的值) {//匹配到这个checkbox就设置check
                    $(this).checked=true;
            }
        }       
});

回答5:

修改跟删除ca道理 用f些前页面编辑工b具3直接表格7修改doradock比2较复杂ve般做点击修改跳转另ey页面比4editjsp跳转候id传editjsp查id条数据页面ebform像新增数据op原先数据显示3都vq
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