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  • Javascript 将变量（文本框）乘以一个数字，如果满足某些条件，则根据文本框中的输入发送警报

Javascript 将变量（文本框）乘以一个数字，如果满足某些条件，则根据文本框中的输入发送警报

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Javascript 将变量（文本框）乘以一个数字，如果满足某些条件，则根据文本框中的输入发送警报,javascript,jquery,html,Javascript,Jquery,Html,我编写了javascript代码，用于在文本框中满足某些条件时提醒用户。如果满足这些条件，变量“singlenum”应乘以40，并成为网页（当前未）发送的警报的一部分 <!doctype html> <html> <head> <meta charset="utf-8"> <title>West London Boats</title> <meta name="description" content="A

我编写了javascript代码，用于在文本框中满足某些条件时提醒用户。如果满足这些条件，变量“singlenum”应乘以40，并成为网页（当前未）发送的警报的一部分

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>West London Boats</title>
  <meta name="description" content="A company based in West London, offering high quality boat voyages down the Thames">
  <meta name="viewport" content="width=device-width">
  <link rel="stylesheet" href="css/reset.css">
  <link rel="stylesheet" href="css/style.css">
</head>
<script type="text/javascript">
  function weclicked() {
    var singlenum = document.getElementById("singlenum").value;
    var tickettype = document.getElementById("tickettype").value;
    var areanum = document.getElementById("areanum").value;
    if (tickettype == "adult" && areanum == 1) {
      (singlenum * 40) {
        alert ("Your booking has been placed, you should recieve an email with your details shortly. Your booking is: " + singlenum + " adult ticket(s) to Area " + areanum + ". This will cost: " + singlenum * 40 + ".");
      }
    }
  }
</script>
<body>
  <section class="book" id="book">
    <div><p><br></p>
      <div class="container group">
        <h3>Book</h3>
        <form>
          <fieldset class="group">
            <div class="column form-left">
              <input type="text" name="fullname" placeholder="Name">
              <input type="email" name="email" placeholder="email@address.com">
            </div>
            <div class="column form-left">
              <input type="value" id="singlenum" placeholder="Number of single tickets"/>
            </div>
            <div class="column form-left">
              <input type="value" id="areanum" placeholder="Area number"/>
            </div>
            <div class="column form-left">
              <input type="value" id="tickettype" placeholder="Adult, child or concession"/>
            </div>
            <textarea name="message" placeholder="Any queries?"></textarea>
          </fieldset>
          <div class="button">
            <button type="button" onClick="weclicked()" id="button">Book</button>
          </div>
        </form>
      </div>
    </section>
  </body>
  </html>


西伦敦船只
函数weclicked（）{
var singlenum=document.getElementById（“singlenum”）.value；
var tickettype=document.getElementById（“tickettype”）.value；
var areanum=document.getElementById（“areanum”）.value；
如果（票证类型==“成人”&&areanum==1）{
（单数*40）{
提醒（“您的预订已经完成，您应该很快就会收到一封包含详细信息的电子邮件。您的预订是：“+singlenum+”到“+areanum+”区域的成人票。这将花费：“+singlenum*40+”）；
}
}
}


书
书
我不知道为什么什么都没发生，在过去的两天里，我浏览了各种网站和问题，寻找答案，没有发现任何东西，我现在请求社区抽出一点时间来帮助我。你能告诉我如何修复我的代码，为什么它不工作，以及你是如何修复的吗？非常感谢。

应该是这样的：

if (tickettype.toLowerCase() == "adult" && areanum == 1) {
    singlenum *= 40; // check if it's correct for your logic
    alert ("Your booking has been placed, you should recieve an email with your details shortly. Your booking is: " + singlenum + " adult ticket(s) to Area " + areanum + ". This will cost: " + singlenum * 40 + ".");
}

<script type="text/javascript">

function weclicked() {
var singlenum = document.getElementById("singlenum").value;
var tickettype = document.getElementById("tickettype").value;
var areanum = document.getElementById("areanum").value;

if (tickettype.toLowerCase() == "adult" && areanum == 1) 
 singlenum2 = singlenum * 40 ;

 alert ("Your booking has been placed, you should recieve an email with  your details shortly. Your booking is: " + singlenum + " adult ticket(s) to Area " + areanum + ". This will cost: " + singlenum2 + ".");


}

</script>
不确定是否要将
singlenum
乘以40两次，由您决定

在
if
条件中，将
.toLowerCase（）
添加到
tickettype
，以覆盖所有“成人”、“成人”、“成人”等

试试这段代码。 只是做了一些简单的修改，对我来说它是有效的

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>West London Boats</title>
  <meta name="description" content="A company based in West London, offering high quality boat voyages down the Thames">
  <meta name="viewport" content="width=device-width">
  <link rel="stylesheet" href="css/reset.css">
  <link rel="stylesheet" href="css/style.css">
</head>
<script type="text/javascript">
  function weclicked() {
    var singlenum = document.getElementById("singlenum").value;
    var tickettype = document.getElementById("tickettype").value;
    var areanum = document.getElementById("areanum").value;
    if (tickettype == "adult" && areanum == 1) 
     singlenum= singlenum * 40 ;
   alert ("Your booking has been placed, you should recieve an email with  your details shortly. Your booking is: " + singlenum + " adult ticket(s) to Area " + areanum + ". This will cost: " + singlenum + ".");
 }
</script>
<body>
  <section class="book" id="book">
    <div><p><br></p>
      <div class="container group">
        <h3>Book</h3>
        <form>
          <fieldset class="group">
            <div class="column form-left">
              <input type="text" name="fullname" placeholder="Name">
              <input type="email" name="email" placeholder="email@address.com">
            </div>
            <div class="column form-left">
              <input type="value" id="singlenum" placeholder="Number of single tickets"/>
            </div>
            <div class="column form-left">
              <input type="value" id="areanum" placeholder="Area number"/>
            </div>
            <div class="column form-left">
              <input type="value" id="tickettype" placeholder="Adult, child or concession"/>
            </div>
            <textarea name="message" placeholder="Any queries?"></textarea>
          </fieldset>
          <div class="button">
            <button type="button" onClick="weclicked()" id="button">Book</button>
          </div>
        </form>
      </div>
    </section>
  </body>
</html>


西伦敦船只
函数weclicked（）{
var singlenum=document.getElementById（“singlenum”）.value；
var tickettype=document.getElementById（“tickettype”）.value；
var areanum=document.getElementById（“areanum”）.value；
如果（票证类型==“成人”&&areanum==1）
singlenum=singlenum*40；
提醒（“您的预订已经完成，您应该很快就会收到一封包含详细信息的电子邮件。您的预订是：“+singlenum+”到“+areanum+”区域的成人票。这将花费：“+singlenum+”）；
}


书
书
利用Nitin提供的改进，我能够想出一个解决方案。 javascript部分应如下所示：

if (tickettype.toLowerCase() == "adult" && areanum == 1) {
    singlenum *= 40; // check if it's correct for your logic
    alert ("Your booking has been placed, you should recieve an email with your details shortly. Your booking is: " + singlenum + " adult ticket(s) to Area " + areanum + ". This will cost: " + singlenum * 40 + ".");
}

<script type="text/javascript">

function weclicked() {
var singlenum = document.getElementById("singlenum").value;
var tickettype = document.getElementById("tickettype").value;
var areanum = document.getElementById("areanum").value;

if (tickettype.toLowerCase() == "adult" && areanum == 1) 
 singlenum2 = singlenum * 40 ;

 alert ("Your booking has been placed, you should recieve an email with  your details shortly. Your booking is: " + singlenum + " adult ticket(s) to Area " + areanum + ". This will cost: " + singlenum2 + ".");


}

</script>


函数weclicked（）{
var singlenum=document.getElementById（“singlenum”）.value；
var tickettype=document.getElementById（“tickettype”）.value；
var areanum=document.getElementById（“areanum”）.value；
if（tickettype.toLowerCase（）=“成人”&&areanum==1）
singlenum2=singlenum*40；
提醒（“您的预订已经完成，您应该很快就会收到一封包含详细信息的电子邮件。您的预订是：“+singlenum+”到“+areanum+”区域的成人票。这将花费：“+singlenum2+”）；
}
它使用新的术语“singlenum2”来保持方程“singlenum*40”。它允许用户查看已发行的单张票证的数量和成本，而无需使用等式来应用单张票证的数量

非常感谢所有响应我请求帮助的人，我真的很感激。祝你愉快

您在2015年10月29日解决的条件块的第一行中有语法错误。此代码将在每次用户根据要求订票时发出警报，并且您提到的特定条件（成人和1号区域的singlenum应乘以40）也可以正常工作。非常感谢！如何更改代码，以便警报输出第一个“singlenum”作为原始的非乘法数字？例如，如果要乘以40的数字是1，我如何使警报变为：您的预订是：1张到1区的成人票。这将花费：40。很高兴我能帮助你。谢谢你，但我试过了，仍然没有警报。当你尝试它时，它工作了吗？我查看了你的代码，结果是单张票的数量是40张（应该是1张），成本是1600张（应该是40张）。原因是单张票的数量应该是用户首先输入的数字，而不是等式的结果。第二部分是不正确的，因为你重复了这个等式，导致1乘以40，然后再乘以40（基本上是40^2）。要解决这个问题，您需要使等式只发生一次，并将术语更改为仅指在警报中第二次使用“singlenum”。