Question

我发现此JavaScript可以计算（在表单提交时）所有带有class =“ qt”的输入字段的总和。如果所有字段的总和小于15，则会在javascript警报弹出窗口中显示一条消息。到目前为止，一切都很好。但是我不喜欢Javascript警报弹出窗口的样式，而且似乎无法设置样式。因此，我想在标准样式对话框中显示消息，而不是标准的Javascript警报弹出窗口。到目前为止还算不错。我唯一不知道的是如何将Javascript变量（sum）的值带入模态窗口并在那里显示它。

表单标签：

<form onsubmit="return calculateSum(this);" method="post" name="order" id="order" action="confirm.php">

Javascript（外部文件：javascript.js）：

function calculateSum() {

var sum = 0;
//iterate through each textboxes and add the values
$(".qt").each(function() {

//add only if the value is number
if(!isNaN(this.value) && this.value.length!=0) {
sum += parseFloat(this.value);
}

});
if(sum<15) {
//alert('Please order at least 15 boxes.\n\nYour current selection is ' + sum + '.');
$(document).ready(function(){$("#myModal").modal("show"); });
return false;
}
else {
return true;
//return confirm('Do you really want to submit the form?');
}
}

显示（html）的（Bootstrap）模式：

<!-- The Modal -->
<div class="modal fade" id="myModal">
<div class="modal-dialog modal-dialog-centered">
<div class="modal-content">

<!-- Modal Header -->
<div class="modal-header">
<h4 class="modal-title">Modal Heading</h4>
<button type="button" class="close" data-dismiss="modal">&times;</button>
</div>

<!-- Modal body -->
<div class="modal-body">
<!--HOW CAN I SHOW THE JAVASCRIPT VARIABLE (sum) HERE?-->
</div>

<!-- Modal footer -->
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>

</div>
</div>
</div>

Answer 1

在模式HTML中添加一个空的<p>标记（或者您希望在模式中显示它），并为其提供一个id，供您在Javascript中使用。然后，将脚本中标记的innerHTML替换为变量：

function calculateSum() {
var sum = 0;
//iterate through each textboxes and add the values
$(".qt").each(function() {
//add only if the value is number
if(!isNaN(this.value) && this.value.length!=0) {
sum += parseFloat(this.value);
}
});
if(sum<15) {
//alert('Please order at least 15 boxes.\n\nYour current selection is ' + sum + '.');
$(document).ready(function(){$("#myModal").modal("show"); });
return false;
}
else {
return true;
//return confirm('Do you really want to submit the form?');
}
document.getElementById('sum').innerHTML=sum;
}
} 
<!-- The Modal -->
<div class="modal fade" id="myModal">
   <div class="modal-dialog modal-dialog-centered">
      <div class="modal-content">
         <!-- Modal Header -->
         <div class="modal-header">
            <h4 class="modal-title">Modal Heading</h4>
            <button type="button" class="close" data-dismiss="modal">&times;</button>
         </div>
         <!-- Modal body -->
         <div class="modal-body">
            <!--HOW CAN I SHOW THE JAVASCRIPT VARIABLE (sum) HERE?-->
            <p id="sum"></p>
         </div>
         <!-- Modal footer -->
         <div class="modal-footer">
            <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
         </div>
      </div>
   </div>
</div>

Answer 2

您可以在准备好的回调中插入消息：

$(document).ready(function() {
  $(".modal-body").html("Please order at least 15 boxes.\n\nYour current selection is " + sum + "."); 
  $("#myModal").modal("show"); 
});

如何将Javascript变量引入模式

2 个答案: