根据用户输入重复 div（首选 JavaScript 解决方案）

Question

Looking for the simplest implementation of the following problem:

I have a user input number field like:

<input type="number" id="numInput" name="numInput" value="1" onchange="myFunc()">

<div id="demo">*** TEST ***</div>

I want to replicate the #demo div based on the #numInput value entered by the user, eg if the user enters '5', there would be five #demo divs displayed on the page. At the moment, I'm using the following function:

function myFunc() {
  var newArray = [];
  var numInput = document.getElementById('numInput').value;
  var x = document.getElementById('demo').innerHTML;

  for(var i=0; i<numInput; i++) {
    newArray.push(x);
  }

  document.getElementById('demo').innerHTML = newArray;
}

but this is adding to the existing array rather than outputting the exact number of divs based on user input. Please advise. Thanks.

Answer 1

There should not be multiple same id values.

 function myFunc() { let numInput = document.getElementById("numInput"); while (numInput.nextSibling) { numInput.nextSibling.remove(); } let numInputval = document.getElementById('numInput').value; for(var i=numInputval; i>0; i--) { var newDiv = document.createElement('div'); newDiv.setAttribute('id', 'demo' + i); newDiv.innerHTML = '*** TEST ***'; numInput.parentNode.insertBefore(newDiv, numInput.nextSibling); } }

 <input type="number" id="numInput" name="numInput" onchange="myFunc()">

+Edit You can also manipulate <form> with javascript.

 function myFunc() { let numInput = document.getElementById("numInput"); while (numInput.nextSibling) { numInput.nextSibling.remove(); } let numInputval = document.getElementById('numInput').value; for(var i=numInputval; i>0; i--) { var newInput = document.createElement('input'); newInput.setAttribute('id', 'demoInput' + i); newInput.setAttribute('type', 'text'); newInput.setAttribute('name', 'demoInputName' + i); newInput.setAttribute('onchange', 'myFormChangeListener(this)'); numInput.parentNode.insertBefore(newInput, numInput.nextSibling); numInput.parentNode.insertBefore(document.createElement('br'), numInput.nextSibling); } } function myFormChangeListener(element) { console.log(element); console.log(element.value); myForm.action = 'http://the.url/'; myForm.method = 'post'; console.log(myForm); //myForm.submit; }

 <form id="myForm"> <input type="number" id="numInput" name="numInput" onchange="myFunc()"> </form>