JQuery函数根据隐藏的HTML输入元素的值显示元素

Question

只是为了说明我的回答，对于JQUERY，我绝对是新手。

我试图创建一个DOM就绪函数，它取得一个隐藏的HTML输入字段的值，如果值是...（某些）然后显示某个<div>类。

这里是我的代码：

JS - 更新

$(document).ready(function(){ 

    var money = 19.95; 

    /* not sure if this is written correctly, but this is supposed to 
    check whether the hidden input element value is equal to var money */ 

    if ($("input[id='VAT_shipping'][type='hidden']").val() == money) { 

    $("#ac-wrapper").show(); 
    $("#popup").show(); 

    }; 

    // hide popup when user clicks on close button 
    $(".close-btn").click(function(){ 
     $("#ac-wrapper").hide(); 
     // hide 
    }); 

    // hides the popup if user clicks anywhere outside the container 
    $("#ac-wrapper").click(function(){ 
     $("#popup").hide(); 
    }) 

    // prevents the overlay from closing if user clicks inside the popup overlay 
    $("#ac-wrapper.").click(function(e) { 
    e.preventDefault();   
    var $this = $(this); 
    var horizontalPadding = 30; 
    var verticalPadding = 30;  
    }); 
}); 

HTML

<input type="hidden" id="VAT_shipping" value="<? print $shipping; ?>" /> 

<div id="ac-wrapper"> 
    <div id="popup"> 
     <center> 
     <p> 
     <strong> You have selected World Free Tax Zone - £19.95 for shipping. </strong> 

     We will automatically remove the VAT - 20% from your order. 

     Please click close to return to review your order. 

     </p> 
     <button class="close-btn">Close</button> 
     </center> 
    </div> 
     </div> 

CSS

#ac-wrapper { 
    display:none; 
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    background: rgba(255,255,255,.6); 
    z-index: 1001; 
    } 
#popup { 

    width: 555px; 
    height: 375px; 
    background: #FFFFFF; 
    border: 5px solid #000; 
    border-radius: 25px; 
    -moz-border-radius: 25px; 
    -webkit-border-radius: 25px; 
    box-shadow: #64686e 0px 0px 3px 3px; 
    -moz-box-shadow: #64686e 0px 0px 3px 3px; 
    -webkit-box-shadow: #64686e 0px 0px 3px 3px; 
    position: relative; 
    top: 200px; left: 375px; 
    font-size: 16px; 
    font-family: 'Oxygen', sans-serif; 
    text-align: center 
} 

    .close-btn { 
     cursor: pointer; 
    font-family:Tahoma, Geneva, sans-serif; 
    border: 1px solid #000000; 
    color: #ffffff; 
    background-color: #AC9E33; 
    -webkit-border-radius: 3px; 
    -moz-border-radius: 3px; 
    border-radius: 3px; 
    text-shadow: 0 1px 1px #000000; 
    font: bold 11px Sans-Serif; 
    text-transform:none; 
    padding: 7px 12px; 
    margin:0; 
    background-image: -webkit-linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    background-image: -moz-linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    background-image: -o-linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    background-image: -ms-linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    background-image: linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    -webkit-transition: background-color 0.3s; 
    -moz-transition: background-color 0.3s; 
    -o-transition: background-color 0.3s; 
    -ms-transition: background-color 0.3s; 
    transition: background-color 0.3s; 
} 
    .close-btn:hover { 
    font-family:Tahoma, Geneva, sans-serif; 
    border: 1px solid #000000; 
    color: #ffffff; 
    background-color: #515280; 
    -webkit-border-radius: 3px; 
    -moz-border-radius: 3px; 
    border-radius: 3px; 
    text-shadow: 0 1px 1px #000000; 
    font: bold 11px Sans-Serif; 
    text-transform:none; 
    padding: 7px 12px; 
    margin:0; 
    background-image: -webkit-linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    background-image: -moz-linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    background-image: -o-linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    background-image: -ms-linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    background-image: linear-gradient(transparent, rgba(0, 0, 0, 0.2)); 
    -webkit-transition: background-color 0.3s; 
    -moz-transition: background-color 0.3s; 
    -o-transition: background-color 0.3s; 
    -ms-transition: background-color 0.3s; 
    transition: background-color 0.3s; 
} 

因此，jQuery函数检查shipping输入字段的值，如果它等于var money = 19.95，则会显示ac-wrapper和嵌套popup。然后客户端可以关闭这个窗口，使用`close-btn'或单击元素外部。

有人可以解释如何做到这一点，请。

Answer 1

你的第一个问题是

if ($("input[name='shipping']").val(money);) { 

应该

if ($("input[id='shipping']").val() == money) { 

OR

if ($("input[id='shipping'][type='hidden']").val() == money) { 

Answer 2

从事物你试图确定是否要显示弹出长相基于下拉列表的值（在您的代码中说）。为此，你需要一个下拉菜单。

<select id="shipping_dropdown" name="shipping_dropdown" required> 
    <option value="">Select shipping method</option> 
    <option value="25.00">Not this one</option> 
    <option value="19.95">This one</option> 
</select> 

接下来你说你想从隐藏的<input>字段读取数值。为什么？这似乎没有必要。您可以执行以下操作来阅读用户的选择。

<script type="text/javascript"> 
    $(document).ready(function({ 
     $("#shipping_dropdown").change(function(){ 
      //Handler for when the value of this ID (shippping_dropdown) changes 
      if($(this).val() == "19.95"){ 
       //Replace alert() with your pop-up 
       alert("You have selected World Free Tax Zone - £19.95 for shipping."); 
      } 
     }); 
    }); 
</script> 

请参阅.change（）函数here。

Answer 3

您的代码

if ($("input[name='shipping']").val(money);) { 
     //code 

    $('.ac-wrapper').show().css({'height' : docHeight}); 
    $('.popup').css({'top': scrollTop+20+'px'}); 
}); 

可使用两种语法错误

• 第一行：if ($("input[id='shipping']").val()==money) {
• 最后一行：}