How to implement hidden Form in JavaScript

In many web applications, developers often need to use forms to receive information provided by users. However, sometimes we need to hide the form, such as placing a button at the head or bottom of the web page, and the form will automatically pop up after the user clicks it. This article will explain how to use JavaScript to hide a form.

The first step to hide a form is to set the display attribute of the form to "none". This way the form will not be displayed on the page. Here's an example where an HTML form is set to display:none:

<form id="myForm" style="display:none;">
   <!-- 表单内容 -->
</form>

It's easy to hide a form using JavaScript. We simply get the form using the getElementById() method and set its style to "none". In this example, we set the form's id to "myForm":

document.getElementById("myForm").style.display = "none";

As you can see, we only need to set the style display to none to hide the form. Note: This method can be problematic if the form has not fully loaded before using this method. In this case, we can use the window.onload method to ensure that the form is completely loaded before executing the code that hides the form.

In HTML, you can set a button or link to show or hide a form. Here is an example of using JavaScript and HTML to achieve this functionality:

HTML:

点击这里来填写表单
<form id="myForm" style="display:none;">
   <!-- 表单内容 -->
</form>

JavaScript:

function toggleForm() {
   var form = document.getElementById("myForm");
   if (form.style.display === "none") {
      form.style.display = "block";
   } else {
      form.style.display = "none";
   }
}

Code Analysis:

• In In the HTML code, we use a link to trigger the JavaScript function toggleForm(). By clicking on a link we can show or hide the form in any part of the page.
• In the JavaScript code, we define a function called toggleForm(), which will change the style of the form based on its current state.
• If the form is hidden (style is "none"), we change the style to "block" so that the form will be displayed.
• If the form is already displayed (style is not "none"), we change the style to "none" so that the form will be hidden.

Summary:

Using JavaScript to hide the form can easily hide and show the form. With simple HTML and JavaScript code, you can show or hide forms on any part of the web page. This little trick is very useful in the implementation process such as login box.

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