Angularjs: 滚动到div底部

Question

Angularjs: 滚动到div底部

javascriptcssangularjsscrollangular-material

6

我遇到了滚动到最后一条消息的问题。

var app=angular.module('myApp', ['ngMaterial'] );
app.controller('ChatCtrl', function($window, $anchorScroll){
  var self = this;
  self.messageWindowHeight = parseInt($window.innerHeight - 170) + 'px';
  self.messages = [];
  for(var i = 1 ; i<=200;i ++){
    self.messages.push(i);
  }
  
  self.user = { text : ""};
  self.send = function(){
    self.messages.push(angular.copy(self.user.text));
    self.user.text = "";
  }
});

app.directive('scrollToBottom', function($timeout, $window) {
    return {
        scope: {
            scrollToBottom: "="
        },
        restrict: 'A',
        link: function(scope, element, attr) {
            scope.$watchCollection('scrollToBottom', function(newVal) {
                if (newVal) {
                    $timeout(function() {
                        element[0].scrollTop =  element[0].scrollHeight;
                    }, 0);
                }

            });
        }
    };
});

/* Styles go here */
.chat-box {
    padding: 8px;
    border-radius: 8px;
}
.message-box {
    border-top: 1px solid #E0E0E0;
    position: fixed;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 120px;
    background: white;
}

.message {
    overflow: scroll;
    margin: 4px;
    border: 1px solid #E0E0E0;
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    border-radius: 8px;
    height: 110px;
}

<!DOCTYPE html>
<html>

<head>
  <link rel="stylesheet" href="style.css">
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/angular-material/1.0.9/angular-material.css">
  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=RobotoDraft:300,400,500,700,400italic">
</head>

<body ng-app='myApp' layout="column" layout-fill ng-controller="ChatCtrl as ctrl">
  <!-- content starts here -->
  <md-toolbar class="md-whiteframe-z2">
    <div class="md-toolbar-tools">
      <h2>
          hello
        </h2>
    </div>
  </md-toolbar>
  <md-content layout="column" style="background-color: #F5F5F5;"
              ng-style="{'height':ctrl.messageWindowHeight}">
      <div class="chat-box">
        <ol class="discussion" scroll-to-bottom="ctrl.messages">
          <li ng-repeat="message in ctrl.messages track by $index" id="msg-{{$index}}">
            {{message}}
          </li>
        </ol>
      </div>
  </md-content>
  <form name="userForm" novalidate ng-submit="ctrl.send()" layout="row" layout-padding layout-align="center center" class="message-box">
    <div class="message" flex>
      <md-input-container class="md-block">
        <input type="text" name="text" ng-model="ctrl.user.text" />
      </md-input-container>
    </div>
    <md-button class="md-icon-button" type="submit">
      send
    </md-button>
  </form>

  <!-- content ends here -->


  <!-- Angular Material Dependencies -->
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular-animate.min.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular-aria.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular-material/1.0.9/angular-material.js"></script>

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

</html>

这是我的代码的实例。

- nitin

除非你想自己实现，否则你可以考虑使用像scroll-glue这样的库。 - Vladimir M

我们可以使用https://github.com/Luegg/angularjs-scroll-glue来满足相同的需求，也许这是一个选择。 - troig

滚动粘附不起作用，已经尝试过了。 - nitin

3个回答

1

不要使用scrollTop，而是使用element[0].scrollIntoView(false);。请参见https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView。

- bcherny

0

您可以使用这个Angular代码来向下滚动

<div id="focusBtn"></div>

const element = document.getElementById("focusBtn");
element.scrollIntoView({ behavior: "smooth", block: "end", inline: "nearest" });

- Mukul Raghav

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- georgeawg · Accepted Answer

将 scroll-to-bottom 指令移动到 md-content 元素中。

 <!-- MOVE directive here -->
 <md-content ͟s͟c͟r͟o͟l͟l͟-͟t͟o͟-͟b͟o͟t͟t͟o͟m͟=͟"͟c͟t͟r͟l͟.͟m͟e͟s͟s͟a͟g͟e͟s͟"͟ layout="column"
             style="background-color: #F5F5F5;" 
             ng-style="{'height':ctrl.messageWindowHeight}">
      <div class="chat-box">
        <!-- NOT HERE -->
        <ol class="discussion" ̶s̶c̶r̶o̶l̶l̶-̶t̶o̶-̶b̶o̶t̶t̶o̶m̶=̶"̶c̶t̶r̶l̶.̶m̶e̶s̶s̶a̶g̶e̶s̶"̶ >
          <li ng-repeat="message in ctrl.messages track by $index" id="msg-{{$index}}">
            {{message}}
          </li>
        </ol>
      </div>
  </md-content>

scroll-to-bottom指令需要在实际滚动的元素上操作。实际滚动的元素是<md-content>元素，因为它的高度受到其ng-style指令创建的CSS的限制。而<ol>元素不是滚动的，其scrollHeight属性是恒定的。

演示DEMO

var app=angular.module('myApp', ['ngMaterial'] );
app.controller('ChatCtrl', function($window, $anchorScroll){
  var self = this;
  self.messageWindowHeight = parseInt($window.innerHeight - 170) + 'px';
  self.messages = [];
  for(var i = 1 ; i<=200;i ++){
    self.messages.push(i);
  }
  
  self.user = { text : ""};
  self.send = function(){
    self.messages.push(angular.copy(self.user.text));
    self.user.text = "";
  }
});

app.directive('scrollToBottom', function($timeout, $window) {
    return {
        scope: {
            scrollToBottom: "="
        },
        restrict: 'A',
        link: function(scope, element, attr) {
            scope.$watchCollection('scrollToBottom', function(newVal) {
                if (newVal) {
                    $timeout(function() {
                        element[0].scrollTop =  element[0].scrollHeight;
                    }, 0);
                }

            });
        }
    };
});

/* Styles go here */
.chat-box {
    padding: 8px;
    border-radius: 8px;
}
.message-box {
    border-top: 1px solid #E0E0E0;
    position: fixed;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 120px;
    background: white;
}

.message {
    overflow: scroll;
    margin: 4px;
    border: 1px solid #E0E0E0;
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    border-radius: 8px;
    height: 110px;
}

   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/angular-material/1.0.9/angular-material.css">
  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=RobotoDraft:300,400,500,700,400italic">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular-animate.min.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular-aria.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular-material/1.0.9/angular-material.js"></script>
<body ng-app='myApp' layout="column" layout-fill ng-controller="ChatCtrl as ctrl">
  <!-- content starts here -->
  <md-toolbar class="md-whiteframe-z2">
    <div class="md-toolbar-tools">
      <h2>
          hello
        </h2>
    </div>
  </md-toolbar>
  <md-content scroll-to-bottom="ctrl.messages" layout="column" style="background-color: #F5F5F5;" ng-style="{'height':ctrl.messageWindowHeight}">
      <div class="chat-box">
        <ol class="discussion">
          <li ng-repeat="message in ctrl.messages track by $index" id="msg-{{$index}}">
            {{message}}
          </li>
        </ol>
      </div>
  </md-content>
  <form name="userForm" novalidate ng-submit="ctrl.send()" layout="row" layout-padding layout-align="center center" class="message-box">
    <div class="message" flex>
      <md-input-container class="md-block">
        <input type="text" name="text" ng-model="ctrl.user.text" />
      </md-input-container>
    </div>
    <md-button class="md-icon-button" type="submit">
      send
    </md-button>
  </form>
</body>