Flex证明内容结束引导项目

时间：2018-11-09 06:21:03

标签： html css flexbox bootstrap-4

Codepen -> https://codepen.io/SubSul/pen/LgWzVw。

我修改了bootstrap 4导航栏组件，在右上角添加了用于登录的固定按钮下拉菜单。我现在正在尝试将导航项对准登录按钮上的操纵杆，但是justify-content: flex-end似乎并没有将其推向右侧。

我尝试在导航项中添加左边距，但无济于事。

我正在尝试在桌面上实现这一目标-

enter image description here

在移动设备上，我试图将徽标中心对齐，并将登录按钮固定在右侧。我可以使用margin-right将徽标移到中心，但是点击汉堡包时的过渡会将徽标向左移一点，如何将其固定在中心-

enter image description here 

<html>
<head>
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
        integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
</head>
<body>

<div class="main">
  <nav class="navbar navbar-expand-lg navbar-light bg-light">
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarText" aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">Navbar Logo</a>
    <div class="collapse navbar-collapse justify-content-end" id="navbarText">
      <ul class="navbar-nav">
        <li class="nav-item active">
          <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Features</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Pricing</a>
        </li>
      </ul>
    </div>
  </nav>
  <div class="login-widget">
    <button class="btn btn-secondary btn-lg dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Log In
    </button>
    <div class="dropdown-menu dropdown-menu-right">
      <form class="px-4 py-3">
        <div class="form-group">
          <label for="exampleDropdownFormEmail1">Email address</label>
          <input type="email" class="form-control" id="exampleDropdownFormEmail1" placeholder="email@example.com">
        </div>
        <div class="form-group">
          <label for="exampleDropdownFormPassword1">Password</label>
          <input type="password" class="form-control" id="exampleDropdownFormPassword1" placeholder="Password">
        </div>
        <div class="form-check">
          <input type="checkbox" class="form-check-input" id="dropdownCheck">
          <label class="form-check-label" for="dropdownCheck">
            Remember me
          </label>
        </div>
        <button type="submit" class="btn btn-primary">Sign in</button>
      </form>
      <div class="dropdown-divider"></div>
      <a class="dropdown-item" href="#">New around here? Sign up</a>
      <a class="dropdown-item" href="#">Forgot password?</a>
    </div>
  </div>

</div>

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"
        integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
        crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
        integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
        crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"
        integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
        crossorigin="anonymous"></script>
</body>
</html>

样式

.main {
  display: flex;
  justify-content: space-between;
}
.dropdown-menu {
  margin-top: 15px;
}
.navbar-collapse {
  /* margin-left: 100%; */
}
.login-widget {
  /* margin-left: 320px; */
}

1 个答案:

答案 0 :(得分：1)

我想出了一个解决方案，虽然它不是我做的最干净的，但也许对您有用，我没有使用flexbox这样做，因此您可以删除.main css，首先需要在nav标签内移动.login-widget div，这样做将使其与您在台式机上一样。

 >library(raster)
 >setwd("D:/mtech project/data/DEC 16/RH/1-DEC-16/extracted/")
 >inFiles1 <- list.files(pattern="*.tif")
 > nFiles1 <-  length(inFiles1)
 > setwd("D:/mtech project/data/extracted/")
 > inFiles2 <- raster("3DIMG_01DEC2016_0000_L2C_FOG_FOG.tif")
 > for (i in 1:nFiles1) {
 +     r1<-raster(inFiles1[[i]])    
 +     r2<-inFiles2    
 +     rs<-resample(r1,r2,method="bilinear")
 +     write.Raster(rs, paste0('D:/mtech project/data/DEC 16/RH/RESAMPLED/rs_',i,'.img'), overwrite=T)
 +   }

 Error in .local(.Object, ...) : 

 Error in .rasterObjectFromFile(x, band = band, objecttype = "RasterLayer",  :   Cannot create a RasterLayer object from this file. (file does not exist)

但是我们在移动设备上会遇到问题，当您点击汉堡包菜单.login-widget div时，它将与菜单中的其他导航项保持一致， 破坏您的布局，所以我要解决此问题，它使.login-widget的位置绝对不变

<nav class="navbar navbar-expand-lg navbar-light bg-light">
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarText" aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">Navbar Logo</a>
    <div class="collapse navbar-collapse justify-content-end" id="navbarText">
    <ul class="navbar-nav">
        <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
        </li>
        <li class="nav-item">
        <a class="nav-link" href="#">Features</a>
        </li>
        <li class="nav-item">
        <a class="nav-link" href="#">Pricing</a>
        </li>
    </ul>
    </div>

    <div class="login-widget">
            <button class="btn btn-secondary btn-lg dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Log In
            </button>
            <div class="dropdown-menu dropdown-menu-right">
            <form class="px-4 py-3">
                <div class="form-group">
                <label for="exampleDropdownFormEmail1">Email address</label>
                <input type="email" class="form-control" id="exampleDropdownFormEmail1" placeholder="email@example.com">
                </div>
                <div class="form-group">
                <label for="exampleDropdownFormPassword1">Password</label>
                <input type="password" class="form-control" id="exampleDropdownFormPassword1" placeholder="Password">
                </div>
                <div class="form-check">
                <input type="checkbox" class="form-check-input" id="dropdownCheck">
                <label class="form-check-label" for="dropdownCheck">
                    Remember me
                </label>
                </div>
                <button type="submit" class="btn btn-primary">Sign in</button>
            </form>
            <div class="dropdown-divider"></div>
            <a class="dropdown-item" href="#">New around here? Sign up</a>
            <a class="dropdown-item" href="#">Forgot password?</a>
            </div>
        </div>

</nav>

这将解决.login-widget的问题，但现在我们又遇到了一个问题。.navbar-brand没有居中，因此我要解决的问题再次使用绝对位置

.login-widget{
    position: absolute;
    right: 16px;
    top: 4px;
}

最后，您必须将此类包装在媒体查询中，以重置桌面的值。

.navbar-brand{
    position: absolute;
    top: 8px;
    right: calc(109px + 16px);
    left: calc(56px + 16px);
    text-align: center;
}

Here如果您想测试一个码本，请告诉我，这是否是您想要的解决方案！

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