如何在reactjs中正确地绝对定位

Question

整个事情对我来说都是一个误会，请忽略！

我已经尝试研究此问题，但提出的唯一解决方案是对本机响应。我的问题基本上是CSS在reactjs环境中的行为不同于常规的行为。这是我的意思：

class TodoApp extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
    	items: [
      	{ text: "Learn JavaScript", done: false },
        { text: "Learn React", done: false },
        { text: "Play around in JSFiddle", done: true },
        { text: "Build something awesome", done: true }
      ]
    }
  }
  
  render() {
    return (
        <form>
        <div id="cart">

        {/* Cart Header */}

        <div id="cart-header">
          <div id="edit-icon" className="header-icon">
            <p>EDIT</p>
          </div>
          <div className="header-line"></div>
          <div id="payment-icon" className="header-icon">
            <p>PAYMENT</p>
          </div>
          <div className="header-line"></div>
          <div id="confirm-icon" className="header-icon">
            <p>COMFIRM</p>
          </div>
        </div>

        {/* Cart Body */}

        {/* Personal information */}
        <div id="cart-body-left" className="cart-body">
          <h2>Personal information</h2>
          <fieldset id="info-fieldset">

            <div id="name" className="input-div-container">

              <div id="first-name" className="input-div">
                <input type="text" placeholder="First Name"/>
                <label className="input-label">First Name</label>
              </div>

              <div id="last-name" className="input-div">
                <input type="text" placeholder="Last Name"  />
                <label className="input-label">Last Name</label>
              </div>

            </div>

            <div id="email" className="input-div">
              <input type="email" placeholder="Email" />
              <label className="input-label">Email</label>
            </div>

            <div id="number" className="input-div">
              <input type="text" placeholder="Number" />
              <label className="input-label">Number</label>
            </div>

            <div id="address-apt" className="input-div-container">

              <div id="address" className="input-div">
                <input type="text" placeholder="Address" />
                <label className="input-label">Adress</label>
              </div>

              <div id="apt" className="input-div">
                <input type="text" placeholder="Apt, Unit, etc" />
                <label className="input-label">Apt, Unit, etc</label>
              </div>

            </div>

            <div id="zip-city-state" className="input-div-container">

              <div id="zip" className="input-div">
                <input type="text" placeholder="Zip" />
                <label className="input-label">Zip</label>
              </div>

              <div id="city" className="input-div">
                <input type="text" placeholder="City" />
                <label className="input-label">City</label>
              </div>

              <div id="state" className="input-div">
                <select id="state-select">
                  <option value="AL">AL</option>
                  <option value="AK">AK</option>
                  <option value="AS">AS</option>
                  <option value="AZ">AZ</option>
                  <option value="AR">AR</option>
                  <option value="CA">CA</option>
                  <option value="CO">CO</option>
                  <option value="CT">CT</option>
                  <option value="DE">DE</option>
                  <option value="DC">DC</option>
                  <option value="FM">FM</option>
                  <option value="FL">FL</option>
                  <option value="GA">GA</option>
                  <option value="GU">GU</option>
                  <option value="HI">HI</option>
                  <option value="ID">ID</option>
                  <option value="IL">IL</option>
                  <option value="IN">IN</option>
                  <option value="IA">IA</option>
                  <option value="KS">KS</option>
                  <option value="KY">KY</option>
                  <option value="LA">LA</option>
                  <option value="ME">ME</option>
                  <option value="MH">MH</option>
                  <option value="MD">MD</option>
                  <option value="MA">MA</option>
                  <option value="MI">MI</option>
                  <option value="MN">MN</option>
                  <option value="MS">MS</option>
                  <option value="MO">MO</option>
                  <option value="MT">MT</option>
                  <option value="NE">NE</option>
                  <option value="NV">NV</option>
                  <option value="NH">NH</option>
                  <option value="NJ">NJ</option>
                  <option value="NM">NM</option>
                  <option value="NY">NY</option>
                  <option value="NC">NC</option>
                  <option value="ND">ND</option>
                  <option value="MP">MP</option>
                  <option value="OH">OH</option>
                  <option value="OK">OK</option>
                  <option value="OR">OR</option>
                  <option value="PW">PW</option>
                  <option value="PA">PA</option>
                  <option value="PR">PR</option>
                  <option value="RI">RI</option>
                  <option value="SC">SC</option>
                  <option value="SD">SD</option>
                  <option value="TN">TN</option>
                  <option value="TX">TX</option>
                  <option value="UT">UT</option>
                  <option value="VT">VT</option>
                  <option value="VI">VI</option>
                  <option value="VA">VA</option>
                  <option value="WA">WA</option>
                  <option value="WV">WV</option>
                  <option value="WI">WI</option>
                  <option value="WY">WY</option>
                </select>
              </div>

            </div>

          </fieldset>

        </div>

        {/* Credit Card Information */}
        <div id="cart-body-right" className="cart-body">
        <h2>Credit Card Information</h2>
        <fieldset id="cc-fieldset">

        <div id="cc-number" className="input-div">
        <input type="number" placeholder="Credit Card Number" />
        </div>
        <div id="cc-valid" className="input-div-container">
        <div id="cc-expiration" className="input-div">
        <input type="text" placeholder="MM/YY" />
        </div>
        <div id="cc-cvv" className="input-div">
        <input type="text" placeholder="CVV"  />
        </div>
        <div id="cvv-help" className="input-div">
        <img height="18px" width="18px" src="store/img/question-mark.png" />
        </div>
        </div>
        </fieldset>

        <div id="cart-stats">
        <div className="stats">
        <span>cart total:</span>
        <span>something</span>
        </div>
        <div className="stats">
        <span>cart total:</span>
        <span>something</span>
        </div>
        <div className="stats">
        <span>cart total:</span>
        <span>something</span>
        </div>
        </div>

        <div id="terms-conditions">
        <div className="checkbox">
        <input type="checkbox" id="tc-checkbox" value="0" />
        <label htmlFor="tc-checkbox">Bla bla bla </label>
        </div>
        </div>

        </div>

        {/* Cart Footer */}

        <div className="cart-footer" id="cart-footer-left">
        <div id="coupon">
        <div id="coupon-input">
        <input type="text"/>
        </div>
        <div id="coupon-button">
        <button>hello</button>
        </div>
        </div>
        </div>

        <div className="cart-footer" id="cart-footer-right">

        </div>

        </div>
      </form>
    )
  }
}

ReactDOM.render(<TodoApp />, document.querySelector("#app"))

:root {
  --gold: #e5cb51;
  --silver: #666666;
  --light-silver: #ddd;
}

::placeholder {
  color: var(--silver);
}

h2 {
  text-align: center;
  color: white;
  color: var(--light-silver);
  font-family: Montserrat,"Helvetica Neue",Helvetica,Arial,sans-serif;
}

body {
  background-color: black;
}

p {
  font-family: Raleway;
}

#cart {
  margin: auto;
  margin-top: 100px;
  width: 800px;
  display: grid;
  grid-template-areas:
    "h h"       /* Header */
    "bl br"     /* Body left right */
    "fl fr";    /* Footer left right */
}

#cart-header {
  background-color: black;
  border: 1.5px solid var(--gold);
  border-bottom: 0px;
  border-top-left-radius: 1em;
  border-top-right-radius: 1em;
  grid-area: h;
  display: flex;
  justify-content: center;
  padding: 1em 0;
}

#cart-body-left {
  grid-area: bl;
}

#cart-body-right {
  grid-area: br;
  border-left-width: 0;
}

#cart-footer-left {
  grid-area: fl;
  border-bottom-left-radius: 1em;
}

#cart-footer-right {
  grid-area: fr;
  border-bottom-right-radius: 1em;
}

.cart-body {
  width: 400px;
  height: 400px;
  border: 1.5px solid var(--gold);
  background-color: black;
}

.cart-footer {
  height: 50px;
  width: 400px;
  background-color: var(--gold);
}

#email {
  box-sizing: border-box;
  padding-bottom: 1em;
}

#number {
  box-sizing: border-box;
}

#state > select{
  height: 100%;
  border: 1.5px var(--silver) solid;
  border-radius: 3px;
}

#cc-paypal-option {
  padding-left: 50%;
  margin: 1em;
  border: 1px solid white;
  border-bottom-left-radius: .5em;
  border-bottom-right-radius: .5em;
  padding-bottom: 1em;
}

#cc-paypal-option > button {
  height: 31px;
}

#cart-stats {
  margin: 1em;
  border: 1.5px var(--gold) solid;
  border-radius: .5em;
}

#cart-stats > div:nth-child(2) {
  border-top: 1px var(--gold) solid;
  border-bottom: 1px var(--gold) solid;
  padding: .5em 0;
  margin: .5em 0;
}

#coupon {
  height: 40px;
  width: 300px;
  margin: 5px 50px;
  background-color: black;
  display: flex;
}

#coupon > div {
  width: 200px;
  position: relative;
}

#coupon-input input {
  position: absolute;
  height: 100%;
  right: 0;
  width: 0;
  opacity: 1;
  transition: all .2s ease-in;
}

#coupon-button button {
  height: 100%;
}

#cart-footer-left:hover input[type="text"] {
  width: 100px;
  opacity: 1;
  transition: all .2s ease-out;
}

.header-line {
  width: 75px;
  height: 0px;
  border: 1px solid var(--gold);
  margin: auto 0;
  background-color: var(--gold);
}

.header-icon {
  height: 2em;
  width: 120px;
  border: 1.5px solid var(--gold);
  border-radius: 4px;
  margin: .5em 0px;
  padding-top: .1em;
}

.active-icon {}

.header-icon:hover {
  background-color: var(--gold);
}

.header-icon:hover > p{
  color: black;
}

.header-icon > p {
  text-align: center;
  color: var(--light-silver);
  font-weight: bold;
  font-family: Montserrat,"Helvetica Neue",Helvetica,Arial,sans-serif;
  font-size: 1.2em;
  letter-spacing: 2px;
  line-height: 1.45;
}

.input-label {
  visibility: visible;
  position: absolute;
  display: block;
  color: white;
  top: 0;
  font-size: 1em;
  opacity: 1;
  transform: translateY(-1.5em);
  transition: all 0.2s ease-out;
  margin-left: 10px;
  display: inline;
}

input:placeholder-shown + label {
  opacity: 0;
  visibility: hidden;
  text-align: center;
  transform: translateY(.5em);
}

.input-div-container {
  display: flex;
}

.input-div {
  position: relative;
  padding: 1em;

  /* height: 33px; */
}

/* #first-name,
#last-name {
  width: 198.5px;
} */

.input-div > input {
  width: 100%;
  padding: 5px 10px;
  border-radius: 3px;
  border: 1.5px var(--silver) solid;

  display: block;
}

.input-div > input:focus, #state > select:focus {
  outline: none;
  border: solid var(--gold) 1.5px;
  box-shadow: 0 0 5px var(--gold);
}

.stats {
  margin: .5em;
  display: flex;
  justify-content: center;
}

.stats > span {
  padding: 0 1em;
  color: var(--light-silver);
}

.checkbox {
  position: relative;
  margin: 1em;
  margin-top: 1.3em;
}

.checkbox input[type="checkbox"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}

.checkbox label::before {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 28px;
  height: 28px;
  background-color: white;
  content: '';
}

.checkbox input[type="checkbox"]:checked + label::before {
  background-color: var(--gold);
  color: white;
}

.checkbox input[type="checkbox"]:checked + label::after {
  display: block;
  position: absolute;
  top: 1px;
  left: 8.5px;
  width: 10px;
  height: 20px;
  /* background: black; */
  border: solid black;
  border-width: 0 3px 3px 0;
  transform: rotate(45deg);
  content: '';
}

@media screen and (max-width: 900px) {
  #cart {
    width: 400px;
    display: grid;
    grid-template-areas:
      "h"
      "bl"
      "fl"
      "br"
      "fr";
  }

  #cart-header {
    width: 400px;
  }

  .header-icon {
    width: 75px;
  }

  .header-icon p {
    font-size: .7em;
    letter-spacing: 2px;
    line-height: 2.5;
  }

  #cart-body-right {
    border-left-width: 1.5px;
  }

  #cart-footer-left {
    border-radius: 0px;
  }

  #cart-footer-right {
    border-bottom-left-radius: 1em;
    border-bottom-right-radius: 1em;
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

<div id="app"></div>

Here is how it looks like when I render it without react

How it looks like after I paste my code into jsx

我希望我提供了足够的代码，如果没有，我可以添加到其上

Answer 1

我不确定这是特定于反应的问题。我将您的代码粘贴到JSFiddle中，但是没有遇到同样的问题。如果没有其他已定位的祖先，则已定位的元素将仅默认为root。值得通过HTML查看是否有定位的父母或祖先弄乱了您的定位。