I'm new to Javascript and HTML.

我对Javascript和HTML不熟悉。

I have the following form in HTML:

我有以下HTML表格:

<div id="form-select">
    <form id="date_form" action="" METHOD="POST">
        <datalist id="dates">
            <option value="February 7">February 7</option>
            <option value="February 14">February 14</option>
            <option value="February 21">February 21</option>
            <option value="February 28">February 28</option>
        </datalist>
        <input type="text" class="input" name="data" id="date" value="" list="dates" placeholder="pick a date"><br>
        <input type="submit" name="submit" onClick="myFunction()"/>
    </form>
 </div>

Here's the javascript in a file called script.js. The js file is linked in the header as 'script type="text/javascript" src="script.js':

这是一个名为script.js的文件中的javascript。js文件在header中链接为'script type= ' text/javascript ' src= ' script.js':

function myFunction(){
   var input = document.getElementById("date").value;
   if(input==="February 7"){
      document.getElementById('w1').innerHTML = "<h2> HEADING </h2>;
   }
 };

When I fill out the form and hit submit, the javascript correctly executes the function, but the result (i.e. adding HEADING to the html) happens for a couple of milliseconds before disappearing and resetting to the original page before I had hit submit.

当我填写表单并点击submit时，javascript正确地执行了这个函数，但是结果(即向html添加标题)在我点击submit之前会消失几毫秒，然后重新设置为原始页面。

How do I make it so that the insertion of HEADING remains permanent?

如何使标题的插入保持永久性?

1 个解决方案

<form id="date_form" onsubmit="return myFunction();" ...>

<input type="submit">

function myFunction(){
   var input = document.getElementById("date").value;
   if(input==="February 7"){
      document.getElementById('w1').innerHTML = "<h2> HEADING </h2>";
   }
   return false; // to stop submission
};