Question

我使用的是谷歌地图JavaScript API，我想在短语＆＃34;开始于＆＃34;到＃34; .adp-placemark＆＃34; Google输出的路线中包含的课程：

$('.adp-placemark').prepend('Starting From:');

前置不起作用。但是，如果我查看页面并在Inspector中使用控制台工具然后运行上面的代码，它将会预先设置。

我在哪里放置此代码？我也尝试将它放在一个单独的函数中并准备好文档内部。

＆＃13;

function initMap() {
  var directionsDisplay = new google.maps.DirectionsRenderer;
  var directionsService = new google.maps.DirectionsService;
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 7,
    center: {lat: 41.85, lng: -87.65}
  });
  directionsDisplay.setMap(map);
  directionsDisplay.setPanel(document.getElementById('right-panel'));

  var control = document.getElementById('floating-panel');
  control.style.display = 'block';
  map.controls[google.maps.ControlPosition.TOP_CENTER].push(control);

  var onChangeHandler = function() {
    calculateAndDisplayRoute(directionsService, directionsDisplay);
  };
  document.getElementById('start').addEventListener('change', onChangeHandler);
  document.getElementById('end').addEventListener('change', onChangeHandler);
}

function calculateAndDisplayRoute(directionsService, directionsDisplay) {
  var start = document.getElementById('start').value;
  var end = document.getElementById('end').value;
  directionsService.route({
    origin: start,
    destination: end,
    travelMode: 'DRIVING'
  }, function(response, status) {
    if (status === 'OK') {
      directionsDisplay.setDirections(response);
      $('.adp-placemark').prepend('Starting From:');
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });
}

＆＃13;

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
}
#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}
#right-panel {
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

#right-panel select, #right-panel input {
  font-size: 15px;
}

#right-panel select {
  width: 100%;
}

#right-panel i {
  font-size: 12px;
}
#right-panel {
  height: 100%;
  float: right;
  width: 390px;
  overflow: auto;
}
#map {
  margin-right: 400px;
}
#floating-panel {
  background: #fff;
  padding: 5px;
  font-size: 14px;
  font-family: Arial;
  border: 1px solid #ccc;
  box-shadow: 0 2px 2px rgba(33, 33, 33, 0.4);
  display: none;
}
@media print {
  #map {
    height: 500px;
    margin: 0;
  }
  #right-panel {
    float: none;
    width: auto;
  }
}

＆＃13;

<div id="floating-panel">
  <strong>Start:</strong>
  <select id="start">
    <option value="chicago, il">Chicago</option>
    <option value="st louis, mo">St Louis</option>
    <option value="joplin, mo">Joplin, MO</option>
    <option value="oklahoma city, ok">Oklahoma City</option>
    <option value="amarillo, tx">Amarillo</option>
    <option value="gallup, nm">Gallup, NM</option>
    <option value="flagstaff, az">Flagstaff, AZ</option>
    <option value="winona, az">Winona</option>
    <option value="kingman, az">Kingman</option>
    <option value="barstow, ca">Barstow</option>
    <option value="san bernardino, ca">San Bernardino</option>
    <option value="los angeles, ca">Los Angeles</option>
  </select>
  <br>
  <strong>End:</strong>
  <select id="end">
    <option value="chicago, il">Chicago</option>
    <option value="st louis, mo">St Louis</option>
    <option value="joplin, mo">Joplin, MO</option>
    <option value="oklahoma city, ok">Oklahoma City</option>
    <option value="amarillo, tx">Amarillo</option>
    <option value="gallup, nm">Gallup, NM</option>
    <option value="flagstaff, az">Flagstaff, AZ</option>
    <option value="winona, az">Winona</option>
    <option value="kingman, az">Kingman</option>
    <option value="barstow, ca">Barstow</option>
    <option value="san bernardino, ca">San Bernardino</option>
    <option value="los angeles, ca">Los Angeles</option>
  </select>
</div>
<div id="right-panel"></div>
<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?sensor=false&callback=initMap">
</script>

＆＃13;

Answer 1

编辑：正如评论中所提到的，第一个解决方案是不完整的，因为＆＃39;开始于：＆＃39;被添加到两个表格中（我第一次错过了）

为了仅使用CSS解决问题，您可以添加#features { text-align:center; } .col-md-3.feature{ float:none; display:inline-block; vertical-align:top; }个选择器来查找nth-child(n)以包含前置文本，如下所示：

.adp-placemark

另一方面，因为/* Pseudo-element to add 'Starting from:' to the first element that appears */ .adp > div:nth-child(2) .adp-placemark::before { content: 'Starting from:'; white-space: nowrap; } /* Pseudo-element to add 'Going to:' to the second element that appears */ .adp > div:nth-child(3) .adp-placemark::before { content: 'Going to:'; white-space: nowrap; }代码是由Google Maps Api生成的，我不会尝试以编程方式更改生成的HTML，因为最终API可能会提供一个不同的结构，它会使解决方案失败（成为right-panel或js中的解决方案。）

解决此问题的一种方法是在css中添加css伪类，无需获取时间表格渲染正确，如下：

.adp-placemark

我还更新了您的代码段：

＆＃13;

.adp-placemark::before {
    content: 'Starting from:';
    white-space: nowrap;
}

＆＃13;

function initMap() {
  var directionsDisplay = new google.maps.DirectionsRenderer;
  var directionsService = new google.maps.DirectionsService;
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 7,
    center: {lat: 41.85, lng: -87.65}
  });
  directionsDisplay.setMap(map);
  directionsDisplay.setPanel(document.getElementById('right-panel'));

  var control = document.getElementById('floating-panel');
  control.style.display = 'block';
  map.controls[google.maps.ControlPosition.TOP_CENTER].push(control);

  var onChangeHandler = function() {
    calculateAndDisplayRoute(directionsService, directionsDisplay);
  };
  document.getElementById('start').addEventListener('change', onChangeHandler);
  document.getElementById('end').addEventListener('change', onChangeHandler);
}

function calculateAndDisplayRoute(directionsService, directionsDisplay) {
  var start = document.getElementById('start').value;
  var end = document.getElementById('end').value;
  directionsService.route({
    origin: start,
    destination: end,
    travelMode: 'DRIVING'
  }, function(response, status) {
    if (status === 'OK') {
      directionsDisplay.setDirections(response);
      $('.adp-placemark').prepend('Starting From:');
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });
}

＆＃13;

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
}
#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}
#right-panel {
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

#right-panel select, #right-panel input {
  font-size: 15px;
}

#right-panel select {
  width: 100%;
}

#right-panel i {
  font-size: 12px;
}
#right-panel {
  height: 100%;
  float: right;
  width: 390px;
  overflow: auto;
}
#map {
  margin-right: 400px;
}
#floating-panel {
  background: #fff;
  padding: 5px;
  font-size: 14px;
  font-family: Arial;
  border: 1px solid #ccc;
  box-shadow: 0 2px 2px rgba(33, 33, 33, 0.4);
  display: none;
}

/* Pseudo-element to add 'Starting from:' to the first element that appears */
.adp > div:nth-child(2) .adp-placemark::before {
  content: 'Starting from:';
  white-space: nowrap;
}

/* Pseudo-element to add 'Going to:' to the second element that appears */
.adp > div:nth-child(3) .adp-placemark::before {
    content: 'Going to:';
    white-space: nowrap;
}


@media print {
  #map {
    height: 500px;
    margin: 0;
  }
  #right-panel {
    float: none;
    width: auto;
  }
}

＆＃13;

希望它有所帮助，欢呼声。

Answer 2

您需要等待侧面板呈现（Google Maps Javascript API是事件驱动和异步）。在前置操作周围添加setTimeout可以起作用（证明了这个概念，虽然它是克服了）：

setTimeout(function() {
  $('.adp-placemark').prepend('Starting From:');
}, 500);

（你还需要在你的代码片段中添加jQuery才能使它工作......）这导致浏览器延迟前置操作，直到侧面板的渲染完成。

＆＃13;

function initMap() {
  var directionsDisplay = new google.maps.DirectionsRenderer;
  var directionsService = new google.maps.DirectionsService;
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 7,
    center: {
      lat: 41.85,
      lng: -87.65
    }
  });
  directionsDisplay.setMap(map);
  directionsDisplay.setPanel(document.getElementById('right-panel'));

  var control = document.getElementById('floating-panel');
  control.style.display = 'block';
  map.controls[google.maps.ControlPosition.TOP_CENTER].push(control);

  var onChangeHandler = function() {
    calculateAndDisplayRoute(directionsService, directionsDisplay);
  };
  document.getElementById('start').addEventListener('change', onChangeHandler);
  document.getElementById('end').addEventListener('change', onChangeHandler);
}

function calculateAndDisplayRoute(directionsService, directionsDisplay) {
  var start = document.getElementById('start').value;
  var end = document.getElementById('end').value;
  directionsService.route({
    origin: start,
    destination: end,
    travelMode: 'DRIVING'
  }, function(response, status) {
    if (status === 'OK') {
      directionsDisplay.setDirections(response);
      setTimeout(function() {
        $('.adp-placemark').prepend('Starting From:');
      }, 500);

    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });
}

＆＃13;

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
}
#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto', 'sans-serif';
  line-height: 30px;
  padding-left: 10px;
}
#right-panel {
  font-family: 'Roboto', 'sans-serif';
  line-height: 30px;
  padding-left: 10px;
}
#right-panel select,
#right-panel input {
  font-size: 15px;
}
#right-panel select {
  width: 100%;
}
#right-panel i {
  font-size: 12px;
}
#right-panel {
  height: 100%;
  float: right;
  width: 390px;
  overflow: auto;
}
#map {
  margin-right: 400px;
}
#floating-panel {
  background: #fff;
  padding: 5px;
  font-size: 14px;
  font-family: Arial;
  border: 1px solid #ccc;
  box-shadow: 0 2px 2px rgba(33, 33, 33, 0.4);
  display: none;
}
@media print {
  #map {
    height: 500px;
    margin: 0;
  }
  #right-panel {
    float: none;
    width: auto;
  }
}

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="floating-panel">
  <strong>Start:</strong>
  <select id="start">
    <option value="chicago, il">Chicago</option>
    <option value="st louis, mo">St Louis</option>
    <option value="joplin, mo">Joplin, MO</option>
    <option value="oklahoma city, ok">Oklahoma City</option>
    <option value="amarillo, tx">Amarillo</option>
    <option value="gallup, nm">Gallup, NM</option>
    <option value="flagstaff, az">Flagstaff, AZ</option>
    <option value="winona, az">Winona</option>
    <option value="kingman, az">Kingman</option>
    <option value="barstow, ca">Barstow</option>
    <option value="san bernardino, ca">San Bernardino</option>
    <option value="los angeles, ca">Los Angeles</option>
  </select>
  <br>
  <strong>End:</strong>
  <select id="end">
    <option value="chicago, il">Chicago</option>
    <option value="st louis, mo">St Louis</option>
    <option value="joplin, mo">Joplin, MO</option>
    <option value="oklahoma city, ok">Oklahoma City</option>
    <option value="amarillo, tx">Amarillo</option>
    <option value="gallup, nm">Gallup, NM</option>
    <option value="flagstaff, az">Flagstaff, AZ</option>
    <option value="winona, az">Winona</option>
    <option value="kingman, az">Kingman</option>
    <option value="barstow, ca">Barstow</option>
    <option value="san bernardino, ca">San Bernardino</option>
    <option value="los angeles, ca">Los Angeles</option>
  </select>
</div>
<div id="right-panel"></div>
<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer src="https://maps.googleapis.com/maps/api/js?sensor=false&callback=initMap">
</script>

＆＃13;

前置到Gmaps方向元素

2 个答案: