充值页面单选金额和输入金额的判断

JS部分

function submit(){    //最后点购买的判断！
    var a = $("#rmb").val();
    var b = $("input:checkbox").attr("checked");
    if(b !== 'checked'){
        alert('请阅读协议并同意！');
        return false;
    }else if(!a || isNaN(a)){   //isNAN()是JQUERY里的一个判断是否为非数字的函数    本句  是“ 如果 非a 或者a不是数字”
        alert('请输入数字！');
        return false;
    }
    
    //$("#form1").submit();
}



function costview(num){     //输入金额以后的判断！
    if(isNaN(num)){
        alert('请输入数字!');
        return false;
    }
    $("#rmb").val(num); //取INPUT的VALUE用JQUERY 的VAL
    $('#SpanPayAmount').html(num);//取INPUT的输入内容用HTML
    
}
function clearrmb(a){        //clearrmb();传入参数a,输入数字的那个onclick上调用的clearrmb的a==1，其他的a为空。
    if(a == 1){
        
        $("#SpanPayAmount").removeAttr("disabled");
        return;//选中radio的时候去掉disabled="disabled"并且返回，否则使输入值为0
    
    }

    $("#SpanPayAmount").val(0);   //没有选中radio的时候清零
    $("#SpanPayAmount").attr("disabled","disabled");//将disabled设置为disabled  即.attr("disabled",true);这样写也可以

}

HTMl部分

<form action="/shop/pay" method="post"  accept-charset="utf-8" id="form1">
                            <input type='hidden' value="10" id="rmb">
                        </form>
                            <table cellspacing="0" cellpadding="0" class="section_table01" id="tableFirst" width="760">
                                <tbody>
                                    <tr style="display: none" id="trGroup">
                                        <td>兑换COIN：</td>
                                    </tr>
                                    <tr id="trMoney">
                                        <td>
                                            <span id="AmountRadio" style="margin:0; padding:0;">
                                                <input class="cradio" type="radio" value="10" name="radioamount" onclick="clearrmb();costview(this.value)"  checked="checked">&nbsp;10 Coin
                                                <input class="cradio" type="radio" value="30" name="radioamount" onclick="clearrmb();costview(this.value)">&nbsp;30 Coin
                                                <input class="cradio" type="radio" value="50" name="radioamount" onclick="clearrmb();costview(this.value)">&nbsp;50 Coin
                                                <input class="cradio" type="radio" value="100" name="radioamount" onclick="clearrmb();costview(this.value)">&nbsp;100 Coin
                                                <input class="cradio" type="radio" value="0" name="radioamount" onclick="clearrmb(1);costview(this.value);"> 
                                                </span>
                                                <div style="display: inline;" id="DivMoney"><input type="text" id="SpanPayAmount" style="40px; color:#000;" value='0' disabled="disabled" class="easyui-numberbox" data-options="min:1,max:10000,precision:0,required:true"> Coin</div>
                                            <br>
                                        </td>
                                    </tr>
                                    <tr id="TrPayAmount">
                                            <td height="30" align="center" class="larg_txt">
                                                <span class="b_txt">需要支付RMB：</span><span id="SpanPayAmount" class="highlight_txt">10</span><span class="highlight_txt">元</span>
                                            </td>
                                    </tr>
                                </tbody>
                            </table>
                            
                        </div>
                        <div class="lindotted"></div>
                        <table width="760" border="0" cellspacing="0" cellpadding="0">
                              <tr>
                                <td><input name=" " type="radio" value="" class="alipayradio"/><img src="/themes/tekken2/images/alipay.jpg" width="115" height="51" /></td>
                            </tr>
                            <tr>
                                <td>
                                    <button onclick="submit()" name="conform" class="coin-props-buy1" value=""></button> 
                                    <input type="checkbox" value="checkbox" class="zt1" name="checkbox"  onclick="open1()">
                                    <span class="zt2">我同意该协议</span>
                                    <span class="zt3">(购买前先查看<a onclick="open1()">商城协议</a>)</span>
                                     <div class="simple_overlay" title="商城协议" id="mies1" closeable="true" closed="true" resizable="false" modal="true"  overflow="auto" style="720px; height:320px;" shadow="false" >协议内容<p class="esbtn" align="center"><a class="easyui-linkbutton" onclick="close1()">关闭</a></p>            
                         </div>
                    </td>
                </tr>
            </table>
                    </div>