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css - 图像大小调整和大小适配

转载 作者：行者123 更新时间：2023-11-28 15:18:39 26 4
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我已经完成了一个登录表单模板，但我有几个关于改进它的问题。

首先，我希望LOGO图片能和窗口适配，这样你就可以随时看到所有的(不会被截断)

其次，我希望一切都适应较小的窗口(可能是移动窗口)。目前，一旦窗口达到一定大小，一切都会变得杂乱无章。我的想法是将 Logo 和颜色(左侧部分)移动到顶部，并将所有文本捆绑在一起。

下面我将包括所有使用的代码及其当前状态的屏幕截图。

谢谢!

HTML

<!DOCTYPE html>
<html >
<head>
  <meta charset="UTF-8">
  <title>Belper</title>
  <meta name="author" content="Mathieu Larocque">
  <title>Bepler</title>

  <!-- Meta and Opengraph tags -->
  <meta name="description" content="Material Design Login Form for Mediahawkz.com">
  <meta name="keywords" content="html, html5, css, css3, material, form, login, google material design, material design, mediahawkz, mediahawkz.com">

  <link rel='stylesheet prefetch' href='https://fonts.googleapis.com/icon?family=Material+Icons'>
<link rel='stylesheet prefetch' href='https://fonts.googleapis.com/css?family=Roboto:300'>

      <link rel="stylesheet" href="css/style.css">


</head>

<body>
  <!-- Main content -->
<main role="main">
  <div class="mediahawkz-login">
    <div class="div-left"></div>
    <div class="div-right">
      <div class="rkmd-form login">
        <h2 class="form-title">Login</h2>
        <form id="login" action="" method="POST" onsubmit="return false;">
          <div class="form-field">
            <label class="field-label" for="emailid">Email ID</label>
            <input id="emailid" type="text" name="emailid" class="field-input">
            <i class="material-icons md-18">error_outline</i>
          </div>
          <div class="form-field">
            <label class="field-label" for="pass">Password</label>
            <input id="pass" type="password" name="pass" class="field-input">
            <i class="material-icons md-18">error_outline</i>
          </div>
          <div class="form-row">
            <div class="msg">
              <!-- <span class="error">We can't find that email address. Have you registered?.</span> -->
            </div>
          </div>
          <div class="form-row clearfix">
            <div class="remember float-left">
              <input type="checkbox" name="rem" id="rem">
              <label for="rem">Stay Signed in</label>
            </div>
            <button id="submit" class="rkmd-btn btn-lightBlue ripple-effect float-right">LOGIN</button>
          </div>
          <div class="form-row clearfix">
            <a href="#" data-tab="reset" class="link float-right toggle" onclick="return false;">Forgot your password?</a>
          </div>
        </form>
      </div>

      <div class="rkmd-form reset" style="display: none;">
        <h2 class="form-title">Reset password</h2>
        <form id="reset" action="" method="POST" onsubmit="return false;">
          <div class="form-row">
            <span class="default">You will receive a link to create a new password via email.</span>
          </div>
          <div class="form-field">
            <label class="field-label" for="emailid">Email ID</label>
            <input id="emailid" type="text" name="emailid" class="field-input">
            <i class="material-icons md-18">error_outline</i>
          </div>
          <div class="form-row">
            <div class="msg">
            </div>
          </div>
          <div class="form-row clearfix">
            <button id="reset" class="rkmd-btn btn-lightBlue ripple-effect float-right">RESET PASSWORD</button>
          </div>
          <div class="form-row clearfix">
            <a href="#" data-tab="login" class="link float-right toggle" onclick="return false;">Login</a>
          </div>
        </form>
      </div>
      <div class="copyright">
        <p> Copyright © 2000-2017 - Mathieu Larocque - All Rights Reserved. </p>
      </div>
    </div>
  </div>
</main>
  <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>

    <script  src="js/index.js"></script>

</body>
</html>

CSS

body {
  margin: 0;
  padding: 0;
  font-size: 16px;
  font-family: 'Roboto', sans-serif;
}

*, *::after, *::before {
  -ms-box-sizing: border-box;
  -o-box-sizing: border-box;
  box-sizing: border-box;
}

a {
  color: #03a9f4;
  outline: none;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.link {
  color: #575757;
  font-size: 14px;
}

.mediahawkz-login {
  position: fixed;
  top: 0px;
  left: 0px;
  right: 0px;
  bottom: 0px;
  width: auto;
  height: auto;
  background-color: #f9f9f9;
}
.mediahawkz-login .div-left {
  position: absolute;
  top: 0px;
  left: 0px;
  bottom: 0px;
  width: 50%;
  height: 100%;
  background-color: #6fa7f7;
  background-image: url("http://inddc.in/webroot/assets/img/sample/shortcode/logo/1.png");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: 50% 25%;
}
.mediahawkz-login .div-right {
  overflow: auto;
  position: absolute;
  top: 0px;
  right: 0px;
  bottom: 0px;
  width: 50%;
  height: 100%;
}
.mediahawkz-login .copyright {
  margin-top: 10%;
  text-align: center;
}
.mediahawkz-login .copyright p {
  color: #575757;
  font-size: 13px;
}

.float-left {
  float: left;
}

.float-right {
  float: right;
}

.clearfix {
  *zoom: 1;
}

.clearfix::after {
  content: '';
  display: table;
  line-height: 0;
  clear: both;
}

.rkmd-btn {
  display: inline-block;
  position: relative;
  cursor: pointer;
  height: 35px;
  line-height: 35px;
  padding: 0 1.5rem;
  color: #424242;
  font-size: 15px;
  font-weight: 600;
  font-family: 'Roboto', sans-serif;
  letter-spacing: .8px;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  vertical-align: middle;
  white-space: nowrap;
  outline: none;
  border: none;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  border-radius: 2px;
  -webkit-transition: all .3s ease-out;
  transition: all .3s ease-out;
}
.rkmd-btn:hover {
  text-decoration: none;
}
.rkmd-btn.btn-lightBlue {
  color: #FFF;
  background-color: #03a9f4;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.225);
}
.rkmd-btn.btn-lightBlue:hover {
  box-shadow: 0 2px 10px 0px rgba(0, 0, 0, 0.275);
  background-color: #23b9fc;
}

.ripple-effect {
  display: inline-block;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  vertical-align: middle;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  z-index: 1;
}
.ripple-effect .ripple {
  display: block;
  position: absolute;
  border-radius: 100%;
  background: rgba(255, 255, 255, 0.5);
  -webkit-transform: scale(0);
          transform: scale(0);
  pointer-events: none;
}
.ripple-effect .animated {
  -webkit-animation: ripple 0.6s linear;
          animation: ripple 0.6s linear;
}
@-webkit-keyframes ripple {
  100% {
    opacity: 0;
    -webkit-transform: scale(2.5);
            transform: scale(2.5);
  }
}
@keyframes ripple {
  100% {
    opacity: 0;
    -webkit-transform: scale(2.5);
            transform: scale(2.5);
  }
}

.rkmd-form {
  max-width: 355px;
  margin: 16% auto 0;
}
.rkmd-form .form-title {
  margin: 0;
  padding: 0;
  color: #03a9f4;
  font-size: 30px;
  font-weight: 300;
}
.rkmd-form .form-row {
  display: block;
  margin-top: 0.925em;
}
.rkmd-form .remember {
  margin-top: 6px;
}
.rkmd-form .form-field {
  position: relative;
  height: 72px;
  margin-top: 1em;
  padding: 16px 0 8px 0px;
}
.rkmd-form .form-field i {
  display: none;
  margin-top: 5px;
  float: right;
}
.rkmd-form .form-field::after, .rkmd-form .form-field::before {
  content: '';
  position: absolute;
  left: 0px;
  bottom: 8px;
  width: 100%;
  height: 1px;
  background-color: #cdcdcd;
}
.rkmd-form .form-field::after {
  background-color: #03a9f4;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  -webkit-transform: scaleX(0);
          transform: scaleX(0);
}
.rkmd-form .form-field.focused::after {
  -webkit-transform: scaleX(1);
          transform: scaleX(1);
}
.rkmd-form .field-label {
  position: relative;
  display: block;
  color: #575757;
  font-size: 15px;
  line-height: 16px;
  -webkit-transform: translateY(24px);
          transform: translateY(24px);
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  -webkit-transform-origin: 0 50%;
          transform-origin: 0 50%;
}
.rkmd-form .field-input {
  position: relative;
  display: block;
  color: #575757;
  width: 100%;
  height: 32px;
  font-size: 15px;
  line-height: 16px;
  margin: 0;
  padding: 4px 0;
  border: none;
  outline: none;
  background-color: transparent;
}
.rkmd-form .has-label .field-label {
  -webkit-transform: translateY(0) scale(0.85);
          transform: translateY(0) scale(0.85);
}
.rkmd-form .focused .field-label {
  color: #03a9f4;
}
.rkmd-form input[type="checkbox"] + label:before {
  display: inline-block;
  width: 1em;
  color: #6e6e6e;
  margin: 0 10px 0 0;
  font-family: 'Material Icons';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;
  vertical-align: -6px;
  -webkit-transition: -webkit-transform 0.1s ease;
  transition: -webkit-transform 0.1s ease;
  transition: transform 0.1s ease;
  transition: transform 0.1s ease, -webkit-transform 0.1s ease;
  /* Support for all WebKit browsers. */
  -webkit-font-smoothing: antialiased;
  /* Support for Safari and Chrome. */
  text-rendering: optimizeLegibility;
  /* Support for Firefox. */
  -moz-osx-font-smoothing: grayscale;
  /* Support for IE. */
  -webkit-font-feature-settings: 'liga';
          font-feature-settings: 'liga';
}
.rkmd-form input[type="checkbox"] {
  position: absolute;
  visibility: hidden;
}
.rkmd-form input[type="checkbox"] + label {
  cursor: pointer;
  color: #575757;
}
.rkmd-form input[type="checkbox"] + label:before {
  content: "\e835";
}
.rkmd-form input[type="checkbox"]:checked + label:before {
  content: "\e834";
  color: #03a9f4;
}
.rkmd-form input[type="checkbox"]:active:not(:disabled) + label:before {
  -webkit-transform: scale3d(0.88, 0.88, 1);
          transform: scale3d(0.88, 0.88, 1);
}
.rkmd-form input[type="checkbox"]:disabled + label:before {
  content: "\e909";
  cursor: not-allowed;
  color: rgba(0, 0, 0, 0.157);
}
.rkmd-form .form-field[error]::after, .rkmd-form .form-field[error]::before {
  background-color: #f44336 !important;
}
.rkmd-form .form-field[error] .field-label {
  color: #f44336 !important;
}
.rkmd-form .form-field[error] i {
  display: block;
  color: #f44336 !important;
}
.rkmd-form .msg {
  min-height: 20px;
}
.rkmd-form .error {
  display: block;
  margin: 0;
  padding: 0;
  color: #f44336 !important;
  font-size: 14px;
}
.rkmd-form .default {
  color: #575757 !important;
  font-size: 14px;
}

JS

$(document).ready(function() {
  $(".rkmd-form").rkmd_form();
  $(".ripple-effect").rkmd_rippleEffect();
});

(function($) {
  $.fn.rkmd_form = function() {
    var self, formField, formInput;

    self = $(this);
    formField = self.find(".form-field");
    formInput = self.find(".field-input");

    formInput.on("focus", function() {
      $(this)
        .parent()
        .addClass("focused has-label");
    });
    formInput.on("blur", function() {
      if ($(this).val() == "") {
        $(this)
          .parent()
          .removeClass("has-label");
      }
      $(this)
        .parent()
        .removeClass("focused");
    });
    formInput.each(function() {
      self = $(this);
      if (self.val().length > 0) {
        self.parent().addClass("has-label");
      }
    });
  };

  $.fn.rkmd_rippleEffect = function() {
    var btn, self, ripple, size, rippleX, rippleY, eWidth, eHeight;

    btn = $(this).not("[disabled], .disabled");

    btn.on("mousedown", function(e) {
      self = $(this);
      if (e.button === 2) {
        return false;
      }
      if (self.find(".ripple").length === 0) {
        self.prepend('<span class="ripple"></span>');
      }
      ripple = self.find(".ripple");
      ripple.removeClass("animated");

      eWidth = self.outerWidth();
      eHeight = self.outerHeight();
      size = Math.max(eWidth, eHeight);
      ripple.css({ width: size, height: size });

      rippleX = e.clientX - self.offset().left - size / 2;
      rippleY = e.clientY - self.offset().top - size / 2;

      ripple.css({ top: rippleY + "px", left: rippleX + "px" });
      ripple.addClass("animated");
    });
  };
})(jQuery);

$("#submit").on("click", function() {
  var form = $("#login");
  var emailid = form.find("#emailid");
  var pass = form.find("#pass");

  if (emailid.val() == "") {
    emailid.parent().attr("error", "");
  } else {
    emailid.parent().removeAttr("error");
  }
  if (pass.val() == "") {
    pass.parent().attr("error", "");
  } else {
    pass.parent().removeAttr("error");
  }
});

$("#reset").on("click", function() {
  var form = $("#reset");
  var emailid = form.find("#emailid");

  if (emailid.val() == "") {
    emailid.parent().attr("error", "");
  } else {
    emailid.parent().removeAttr("error");
  }
});

$(".toggle").on("click", function() {
  var tab = $(this).data("tab");
  var parents = $(this)
    .parents(".rkmd-form")
    .hide();
  $("." + tab).show();
});

模板归功于 MediaHawkz.com，我对编码很陌生，使用了免费模板网站上的这个模板。

最佳答案

您的 Logo 问题可以通过将 background-size:cover 切换为 background-size contain 来解决:

.mediahawkz-login .div-left {
 ...
   background-size: contain;
 ...
}

移动部分(称为“响应式”)是通过一些简单的技巧完成的。这里要解释的太多了，但基本原则是:

使用@media 查询更改不同尺寸设备的设计规则:

.mediahawkz-login .div-left {
  float:left;
  width: 100%;
  min-height:100px;
}

@media (min-width:600px){
  .mediahawkz-login .div-left {
    width:50%;
    min-height:100%;
}

首先为移动设备设计，然后使用媒体查询更改大屏幕的布局。这被称为“移动优先”设计，如果您这样想，代码会变得不那么困惑。

使用 css "float"元素使左右元素相互移动。您的模板(顺便说一句，它没有很好的 CSS)使用绝对定位……对于响应式设计来说并不总是一个好的选择。

这是一个代码笔，标识和定位固定。我只需要更改 CSS 中的 2 个元素； .mediahawkz-login .div-left 和 .mediahawkz-login .div-right 。水平或垂直缩小窗口，看看会发生什么......

https://codepen.io/anon/pen/gGewNY

关于css - 图像大小调整和大小适配，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46633104/

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