Create multiple elements

Question

JavaScript

var textBlock = document.createElement('div');
textBlock.setAttribute('class', 'finalBlock');

var addFinalBlock = document.getElementsByClassName('block')[0];
addFinalBlock.appendChild(textBlock);

textBlock.innerHTML = "Make this block a text block";

// -------
var textBlock2 = document.createElement('div');
textBlock2.setAttribute('class', 'finalBlock');

var addFinalBlock2 = document.getElementsByClassName('block')[0];
addFinalBlock2.appendChild(textBlock2);

textBlock2.innerHTML = "Make this block a text block2";

// -------
var textBlock3 = document.createElement('div');
textBlock3.setAttribute('class', 'finalBlock');

var addFinalBlock3 = document.getElementsByClassName('block')[0];
addFinalBlock3.appendChild(textBlock3);

textBlock3.innerHTML = "Make this block a text block3";

// -------
var textBlock4 = document.createElement('div');
textBlock4.setAttribute('class', 'finalBlock');

var addFinalBlock4 = document.getElementsByClassName('block')[0];
addFinalBlock4.appendChild(textBlock4);

textBlock4.innerHTML = "Make this block a text block4";

I want to create 4 elements with different text. The class needs to remain the same. I think I am doing this with to much code.

Maybe anyone has some information how to make this code look more beautiful and more efficient?

Best wishes and thank you!

Answer 1

I believe a better approach will be to only update the DOM once using fragment.

var docFrag = document.createDocumentFragment();

for(var i = 0; i < divs.length; i++) {
  docFrag.appendChild(divs[i]); // Note that this does NOT go to the DOM
} 
document.body.appendChild(docFrag); // Appends all divs at once

Answer 2

This code will work fine. If you want to add multiple elements on same HTML tag.

            var element1=  "<br/>"
            var element2="<input type='text' />"
            var element3= "<br/>"
            var onLine = document.getElementById("onLine"); /* This is <ul id="onLine"></ul> */
            var on = document.createElement("div");

            on.innerHTML = element1+ element3+ element3

            on.setAttribute("style", "background-color:rgba(0, 0, 
            0, 0.3);color:white;border-radius:40px;margin- 
            bottom:30px;padding: 10px;width: 230px;");

            on.appendChild(document.createTextNode('Custom text'));

            onLine.appendChild(on);

Answer 3

You can use the Array.prototype.map() method. It is similar to .forEach() but you return the result.

const textblocks = ["textblock 1", "textblock 2", "textblock 3", "textblock 4"].map(text => {
    let div = document.createElement("div"); // p tag might be better suited for textblocks
    div.classList.add("finalBlock");
    div.textContent = text; // for text only, use textContent
    return div;
});
document.body.append(...textblocks); // append all in one function call

Answer 4

You can create a for loop to create multiple-element

let elementsCount = 3;
for (let i = 0; i < elementsCount; i++) {
     const element = document.createElement('div');
     document.body.appendChild(element);
}

Answer 5

If there is parent child relationship, most efficient way to insert multiple elements is using text as template:

const el = document.createElement('div');

el.innerHTML = `
<div class="final-block">Block One</div>
<div class="final-block">Block Two</div>
<div class="final-block">Block Three</div>
<div class="final-block">Block Four</div>
`;

// Then insert wherever you want
document.querySelector('#app').appendChild(el);

This is faster than iteration and easier to understand.

If you need to generate those children from an array:

const el = document.createElement('ul');
el.innerHTML = ['One', 'Two', 'Three'].reduce((a, c) => a + `<li>${c}</li>`, '');