jquery 中 复选框问题

本帖最后由 zaizaizaizaizai 于 2010-12-24 19:02:59 编辑

解决方案 »

  1.   

    var $c=$(".conlen"); 是哪里来的?
      

  2.   

     var $c=$(".conlen");
    改成 var $c=$("#conlen");
    或着 var $c=$(".cc");
    试下。。
      

  3.   

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>无标题文档</title>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
    <script type="text/javascript">
    $(document).ready(function(){
        $("#conl").change(function(){
            var $c=$(".conlen");
        /*    if($(this).val()==""){
                $("conlen").attr("value","maxlength@15");
            }
            if($(this).val()!=""){
                $("conlen").attr("value",("maxlength@"+$(this.val())));
            }*/
        
            if($c.val()=="maxlength@15"){
                $c.val("maxlength@15");
                $c.removeAttr("checked",'false');//去除选中
            }else{
                //$c.attr("value","maxlength@"+$(("#conl").val()));
                $c.val("maxlength@"+$(this.val()));
                $c.attr("checked",true);//选中
            }    
            alert($c.val());
        });
        $("[name=button]").click(function(){
            alert($("#conlen").val())
        });
    });
    </script>
    </head><body><form action="" method="post"><input name="button" type="button" value="button" /><input type="checkbox" id="conlen" name="con" class="cc" value="maxlength@15"/>maxlength@15   
               要控制的长度：<input type="text" name="co11n" value="" id="conl" class="ckinput"/>
    </form>
    </body>
    </html>不懂你要什么
      

  4.   


    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <title>无标题文档</title>
    <script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
    <script type="text/javascript">
    $(function(){
    $("#conl").change(function(){
    if($(this).val()!=""){
    var num=$(this).val();
    $("#conlen").val("maxlength@"+num);
    $("#la").html("maxlength@"+num);
    $("#conlen").attr("checked","checked");
    }else{
    $("#conlen").attr("checked","");
    $("#conlen").val("maxlength@15");
    $("#la").html("maxlength@15");
    }
    })   $("input[name=button]").click(function(){
            alert($("#conlen").val())
        });})
    </script>
    </head><body><form action="" method="post"><input name="button" type="button" value="button" /><input type="checkbox" id="conlen" name="con" class="cc" value="maxlength@15"/><label id="la">maxlength@15</label>
               要控制的长度：<input type="text" name="co11n" value="" id="conl" class="ckinput"/>
    </form>
    </body>
    </html>