How to create several buttons at once in pure javascript?-CodePudding

CSS grid layout:

.wrapper {
    display: grid;
    grid-template-areas: "btn1 btn2 btn3 btn4";
    grid-template-columns: repeat(4, 1fr);
}
#btn {grid-area: "btn1"}
#btn2 {grid-area: "btn2"}
#btn3 {grid-area: "btn3"}
#btn4 {grid-area: "btn4"}

created by div and button:

const div = document.createElement("div");
div.classList.add("wrapper");
const body = document.body;
body.appendChild(div);
const button = document.createElement("button");
button.textContent = "Click1";
button.setAttribute("id", "btn");

Next, I want to create three more buttons based on the first one and paste them into their respective areas. If you stupidly describe each action:

const b2= button.cloneNode(true);
const b3= button.cloneNode(true);
const b4= button.cloneNode(true);
b2.setAttribute('id', 'btn2');
b3.setAttribute('id', 'btn3');
b4.setAttribute('id', 'btn4');
b2.textContent = "Click" 2;
b3.textContent = "Click" 3;
b4.textContent = "Click" 4;
div.appendChild(button);
div.appendChild(b2);
div.appendChild(b3); 
div.appendChild(b4);

How to do it optimally? Something like this (doesn't work):

let b2, b3, b4;
let arr = [b2,b3,b4]
 let i=2;
     while(i<5){
     for(let j=0; j<arr.length; j  ){
     arr[j].setAttribute('id', 'btn'  i);
     arr[j].textContent= "Click" i;
div.appendChild(arr[j])
      } i  }

CodePudding user response：

There's no need for the repetition, or for the clone, just a single for loop. Here using a documentFragment to avoid multiple insertions into the DOM.

const div = document.createElement('div');
div.classList.add('wrapper');

document.body.appendChild(div);

const buttonCount = 4
const buttonFragment = document.createDocumentFragment();
for (let i = 1; i <= buttonCount; i  ) {
    const button = document.createElement('button');
    button.textContent = `Click${i}`;
    button.id = `btn${i}`;
    buttonFragment.append(button);
}

div.append(buttonFragment);

.wrapper {display: grid; grid-template-areas: "btn1 btn2 btn3 btn4"; grid-template-columns: repeat(4, 1fr);}

#btn1 {grid-area: "btn1"; background-color: pink;}
#btn2 {grid-area: "btn2"; background-color: aquamarine;}
#btn3 {grid-area: "btn3"; background-color: gray;}
#btn4 {grid-area: "btn4"; background-color: salmon;}

CodePudding user response：

Using insertAdjacentHTML simplifies the task. Something like:

document.body.insertAdjacentHTML(`beforeend`, `<div id="buttons">`);
const bttnDiv = document.querySelector(`#buttons`);
const nButtons = 5;
for (let i = 1; i < nButtons   1; i  = 1) {
  bttnDiv.insertAdjacentHTML(
    `beforeend`, 
    `<button id=btn${i}>Click ${i}</button>` );
}

button {margin-right: 3px;}
#buttons {
  border: 1px solid #ddd;
  padding: 0.3rem;
  width: 50vw;
  text-align: center;
}

CodePudding user response：

for(let i = 0; i < 5;   i){
      const btn = const button = document.createElement('button');
      btn.setAttr()
      btn.textContent = something
      div.appendChild(btn)
}

// maybe just like this?