如何使用OnChange和Marketo避免表单重叠加载

Question

我有一个下拉列表，带有“onchange”函数，根据用户输入加载Marketo表单。表单加载正确，只是当用户最初选择“需要新产品”，然后切换到“需要支持”（或反之亦然）时，“产品表单”不会消失。相反，“产品表单”保持不变，而“需要支持”表单会被额外加载（在产品表单下面）。用户可以多次切换/翻转，导致许多额外的表单，这是一个问题！

我需要帮助调整代码，以便始终仅加载一个表单，并且用户选择的先前表单不再存在于用户切换时。有任何帮助吗？谢谢！

<script src="//app-e.marketo.com/js/forms2/js/forms2.js"></script>

<p>How can we help?</p>
<select id="mySelect" onchange="myFunction()">
  <option value="default">--please select a reason--</option>
  <option value="product">Need a new product</option>
  <option value="support">Need support</option>
</select>


<p id="demo"></p>
<script>
function myFunction() {
    var x = document.getElementById("mySelect").value;
    document.getElementById("demo").innerHTML = "You selected: " + x;
    if (x == "product") {
        MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber", *uniquenumber);
    }
    else if (x == "support") {
        MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber2", *uniquenumber2);
    }
}
</script>

<form id="mktoForm_*uniquenumber1"></form>
<form id="mktoForm_*uniquenumber2"></form>

- Joe Pak

Answer 1

我推荐以下做法：

1. Implement a way to check if a Marketo form has loaded. For example:

   //Checks for element that matches "mktoForm_". If match, variable returns id of element. If no match, variable returns undefined. 
   var y = document.querySelector('[id^=mktoForm_]').id;
   

2. Implement a way to remove the Marketo form. For example:

   //jQuery implementation to remove form element
   $( "form" ).remove();
   

3. Implement conditional logic to determine current state. For example:

   if (x == "product" && y === undefined) {
       MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber", *uniquenumber);
   }
   else if (x == "product" && y != undefined) {
       //jQuery implementation to remove form element
       $( "form" ).remove();
       MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber2", *uniquenumber2);
   }
   else if (x == "support" && y === undefined) {
       MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber2", *uniquenumber2);
   }
   else (x == "support" && y != undefined) {
       //jQuery implementation to remove form element
       $( "form" ).remove();
       MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber2", *uniquenumber2);
   }
   

以下是可能的实现方式：

<script>
function myFunction() {
    var x = document.getElementById("mySelect").value;
    //Checks for element that matches "mktoForm_". If no match, variable returns undefined. 
    var y = document.querySelector('[id^=mktoForm_]').id;
    document.getElementById("demo").innerHTML = "You selected: " + x;

    if (x == "product" && y === undefined) {
        MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber", *uniquenumber);
    }
    else if (x == "product" && y != undefined) {
        //jQuery implementation to remove form element
        $( "form" ).remove();
        MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber2", *uniquenumber2);
    }
    else if (x == "support" && y === undefined) {
        MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber2", *uniquenumber2);
    }
    else (x == "support" && y != undefined) {
        //jQuery implementation to remove form element
        $( "form" ).remove();
        MktoForms2.loadForm("//app-e.marketo.com", "*uniquenumber2", *uniquenumber2);
    }
}
</script>

- Murtza Manzur