使被调用的块相对于父块JS居中

Question

有一个区块，当你点击+时，会在它的一侧调用相同的区块。这些块由一条线连接，当再次按下时，另一个块被调用。下面是图表和我的代码。问:如何使新的块(图片中的绿色块)相对于父块(图片中的红色块)居中，而不考虑父块的位置，如图所示？

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let distance = 250;
let count = 0;

document.body.addEventListener("click", function (e) {
    if (e.target.classList.contains("btn")) {
        let div = document.createElement("div"),
            father = e.path[5];
            count = count + 100;
        div.classList = father.classList;
        div.style.left = father.offsetLeft + distance + "px";
        div.style.top = father.offsetTop + count + "px";

        let arrow_width = distance - father.offsetWidth;
        div.innerHTML =
            father.innerHTML +
            `<div class='arrow' style='left: ${-arrow_width}px;width:${arrow_width}px;'><div></div></div>`;
        document.body.append(div);
    }
});

html {
  font-family: FuturaMediumC;
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

article,
aside,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section {
  display: block;
}

body {
  margin: 0;
  font-family: FuturaMediumC;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: left;
  background: #f5f7fa;
}

html,
body {
  scrollbar-color: red #1a1a1a;
  scrollbar-width: thin;
}

.center {
  margin: 0;
  position: absolute;
  top: 50%;
  transform: translate(0%, -50%);
}

body .card {
  position: relative;
  height: 12rem;
  width: 10%;
  min-width: 200px;
  box-shadow: 0 0 2rem -1rem rgba(0, 0, 0, 0.05);
  display: inline-block;
  z-index: 99999999 !important;
}

body .card .multi-button {
  z-index: 0;
  position: absolute;
  top: 1.25rem;
  left: 1.25rem;
  border-radius: 100%;
  width: 0rem;
  height: 0rem;
  transform: translate(-50%, -50%);
  transition: 0.25s cubic-bezier(0.25, 0, 0, 1);
}

body .card .multi-button button {
  display: grid;
  place-items: center;
  position: absolute;
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: 100%;
  background: #000;
  color: #fff;
  transform: translate(-50%, -50%);
  cursor: pointer;
  transition: 0.25s cubic-bezier(0.25, 0, 0, 1);
  box-shadow: 0 0 0rem -0.25rem var(--background);
}

body .card .multi-button button:hover {
  background: var(--text);
  color: var(--background);
  box-shadow: 0 0 1rem -0.25rem var(--background);
}

body .card .multi-button button:first-child:nth-last-child(1):nth-child(1),
body .card .multi-button button:first-child:nth-last-child(1) ~ *:nth-child(1) {
  left: 25%;
  top: 25%;
}

body .card .multi-button button:first-child:nth-last-child(2):nth-child(1),
body .card .multi-button button:first-child:nth-last-child(2) ~ *:nth-child(1) {
  left: 37.5%;
  top: 18.75%;
}

body .card .multi-button button:first-child:nth-last-child(2):nth-child(2),
body .card .multi-button button:first-child:nth-last-child(2) ~ *:nth-child(2) {
  left: 18.75%;
  top: 37.5%;
}

body .card .multi-button button:first-child:nth-last-child(3):nth-child(1),
body .card .multi-button button:first-child:nth-last-child(3) ~ *:nth-child(1) {
  left: 50%;
  top: 15.625%;
}

body .card .multi-button button:first-child:nth-last-child(3):nth-child(2),
body .card .multi-button button:first-child:nth-last-child(3) ~ *:nth-child(2) {
  left: 25%;
  top: 25%;
}

body .card .multi-button button:first-child:nth-last-child(3):nth-child(3),
body .card .multi-button button:first-child:nth-last-child(3) ~ *:nth-child(3) {
  left: 15.625%;
  top: 50%;
}

body .card .multi-button button:first-child:nth-last-child(4):nth-child(1),
body .card .multi-button button:first-child:nth-last-child(4) ~ *:nth-child(1) {
  left: 62.5%;
  top: 18.75%;
}

body .card .multi-button button:first-child:nth-last-child(4):nth-child(2),
body .card .multi-button button:first-child:nth-last-child(4) ~ *:nth-child(2) {
  left: 37.5%;
  top: 18.75%;
}

body .card .multi-button button:first-child:nth-last-child(4):nth-child(3),
body .card .multi-button button:first-child:nth-last-child(4) ~ *:nth-child(3) {
  left: 18.75%;
  top: 37.5%;
}

body .card .multi-button button:first-child:nth-last-child(4):nth-child(4),
body .card .multi-button button:first-child:nth-last-child(4) ~ *:nth-child(4) {
  left: 18.75%;
  top: 62.5%;
}

body .card .cardcontainer {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 1rem;
  background: var(--background);
  color: var(--text);
}

body .card:hover .multi-button,
body .card .multi-button:focus-within {
  width: 10rem;
  height: 10rem;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
  background-color: #1a1a1a;
}

::-webkit-scrollbar-thumb {
  background-color: #000;
  border-radius: 1em;
  box-shadow: inset 1px 1px 10px #f3faf7;
}

::-webkit-scrollbar-thumb:hover {
  background-color: #000;
}

::-webkit-scrollbar-button:vertical:start:decrement {
  background-color: #000;
}

::-webkit-scrollbar-button:vertical:end:increment {
  background-color: #000;
}

::-webkit-scrollbar-button:horizontal:start:decrement {
  background-color: #000;
}

::-webkit-scrollbar-button:horizontal:end:increment {
  background-color: #000;
}

.invisible {
  display: none !important;
}

.schema {
  position: absolute;
  top: 50%;
  left: 50%;
  margin-right: -50%;
  transform: translate(-50%, -50%);
}

.optionsmenu {
  bottom: 0;
  width: 100%;
  height: 25%;
  background: #000;
  position: absolute;
}

.optionsmenu textarea {
  color: #000;
}

.col-1,
.col-2,
.col-3,
.col-4,
.col-5,
.col-6,
.col-7,
.col-8,
.col-9,
.col-10 {
  position: absolute;
}

.col-1-2,
.col-2-3,
.col-3-4,
.col-4-5,
.col-5-6,
.col-6-7,
.col-7-8,
.col-8-9,
.col-9-10 {
  position: absolute;
}

.schema2 {
  display: none;
}

.blue {
  --background: #3f72c3;
  --text: white;
}

.purple {
  --background: #743da0;
  --text: white;
}

.white {
  --background: #e3e8e6;
  --text: black;
}

.arguments {
  z-index: 9999999999;
  position: absolute;
  width: 100%;
  height: 80%;
  bottom: 0;
  background: transparent;
  color: white;
  font-weight: bolder;
  letter-spacing: 2;
}

#in-kod {
  width: 0px;
  height: 0px;
}

.add {
  z-index: 99999999 !important;
}

.btn {
  z-index: 99999999 !important;
  position: absolute;
  width: 25%;
  bottom: 0;
}
.btn2 {
  z-index: 99999999 !important;
  position: absolute;
  width: 25%;
  bottom: 0;
  left: 50%;
}
.btn3 {
  z-index: 99999999 !important;
  position: absolute;
  width: 25%;
  bottom: 0;
  right: 0;
}

.in-kod {
  display: block;
}

.arrow {
  position: absolute;
  top: 50%;
  height: 2px;
  background: #000;
}

<div class='col-6' style="top:50px;left:50px;">
    <span class="in-kod">
        <div class="card purple">
            <div class="multi-button">
                <span class="add">
                    <button class="btn">+</button>
                </span>
            </div>
            <div class="cardcontainer">
                <textarea class="arguments"></textarea>
            </div>
        </div>
    </span>
</div>

​

Answer 1

这里有一个使用CSS Grid的可能的解决方案。

我将父对象和子对象放在单独的容器中，并将它们都包装在一个网格中。然后将网格项目居中对齐。这确保了无论您在子块中有多少项，它始终与父块居中对齐。

试一试下面的内容。单击任何子项以添加另一个子项并亲自查看。

注意: jQuery仅用于使其具有交互性。实际的CSS解决方案不需要任何JS。

​

const children = $(".child");
children.on("click", () => {
  $(".children").append("<div class='child'>Child</div>");
})

* {
  font-family: sans-serif;
}
.wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
}
.parent, .child {
  min-height: 2rem;
  padding: 0.25rem;
  color: white;
}
.parent {
  background: red;
}
.child {
  background: green;
  cursor: pointer;
}
.child + .child {
  margin-top: 1rem;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="wrapper">
  <div class="parent">
    Parent
  </div>
  <div class="children">
    <div class="child">Child</div>
    <div class="child">Child</div>
    <div class="child">Child</div>
  </div>
</div>

​