为什么没有最初的css过渡工作?

时间:2016-03-29 08:34:20

标签: angularjs css-transitions ng-style

我尝试通过向跨度添加类和宽度或高度样式来创建缩放效果。

<span ng-class="fat_or_tall(this)"><figure><img ng-style="set_ratio(this)" draggable="true" class="thumb" id="{{tablet.created}}" title="{{ tablet.title }}" data-ng-src="{{ tablet.src }}" /></figure></span>

它在刷新后的第一页上有效,但是当我点击其他标签时,它只是在大小之间跳跃,好像css转换不存在一样。如果我检查,我会看到有时候样式已呈现,但有时它们没有。单击选项卡并访问每个选项卡后,缩放工作正常。为什么第一次尝试不起作用,我该如何解决?

when it doesn't work. notice there's no style after i click the tab a second time it works well.  Notice there is a style now. 上面的第一张图片通知没有样式,并且转换不起作用,但是在我第二次(第二张图片)点击标签后,样式确实显示并且转换效果很好。

在这里:http://jsfiddle.net/U3pVM/23506/(如果点击刷新它就不会赢,但是如果你单击它就会运行它。样式不会渲染。为什么?)

&#13;
&#13;
function TodoCtrl($scope) {
		$scope.tablet = {} 

    $scope.tablet.title = 'help'
    $scope.tablet.created = Date.now()
    $scope.tablet.src = 'http://tallclub.co.uk/wp-content/uploads/2011/04/Tall-Person-1.png'
    
		$scope.set_ratio = function (it) { //Find ratio and return style so that it can be used for zoom effect. 
    
        console.log(it)
        var img = new Image();  
        img.src = it.tablet.src;
        console.log(it.tablet)

        if(img.height>img.width){
            var h = 300*(img.height/img.width)+'px'     
            return {
                "height": h
            }   
        }else{
            var w = 300*(img.width/img.height)+'px'     
            return {
                "width":w 
            }       
        }
    }  
}

function TodoCtrlTwo($scope) {
		$scope.tablet = {} 

    $scope.tablet.title = 'help'
    $scope.tablet.created = Date.now()
    $scope.tablet.src = 'http://tallclub.co.uk/wp-content/uploads/2011/04/Tall-Person-1.png'
    
		$scope.set_ratio = function (it) { //Find ratio and return style so that it can be used for zoom effect. 
    
        console.log(it)
        var img = new Image();  
        img.src = it.tablet.src;
        console.log(it.tablet)

        if(img.height>img.width){
            var h = 300*(img.height/img.width)+'px'     
            return {
                "height": h
            }   
        }else{
            var w = 300*(img.width/img.height)+'px'     
            return {
                "width":w 
            }       
        }
    }  
}
&#13;
.taller img  {
    -webkit-transition: .3s ease-in-out;
    transition: .3s ease-in-out;

}
.taller img:hover  {
    -webkit-transition: .3s ease-in-out;
    transition: .3s ease-in-out;

    height: 300px !important;
}  

figure  {
	width: 300px;
	height: 300px;
	
	//height: 200px;
	margin: 1em;
	padding: 0;
	background: #fff;
	overflow: hidden;
	border: 1px solid #222;
	
}
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.22/angular.min.js"></script>

<div ng-app>
  <h2>ARGH</h2>
  <div ng-controller="TodoCtrl">
<span class="taller"><figure><img ng-style="set_ratio(this)" draggable="true" class="thumb" id="{{tablet.created}}" title="{{ tablet.title }}" data-ng-src={{tablet.src}} /></figure></span>

  </div>
   <div ng-controller="TodoCtrlTwo">
<span class="taller"><figure><img ng-style="set_ratio(this)" draggable="true" class="thumb" id="{{tablet.created}}" title="{{ tablet.title }}" data-ng-src={{tablet.src}} /></figure></span>

  </div> 
</div>
&#13;
&#13;
&#13; 刷新页面并单击运行代码段,然后将鼠标悬停在上面。图像会跳跃。然后再次单击“运行代码段”并将鼠标悬停在上面。将会顺利过渡。这是为什么?

3 个答案:

答案 0 :(得分:1)

解决方案1:

Working Demo

首次加载图片时,图片的widthheight均为0。因此,执行else块的代码将返回NaNpx

详细信息:

var w = 300*(img.width/img.height)+'px' 
var w = 300*(0/0)+'px'  // As img.width = 0, img.height = 0 
var w = 300*(NaN)+'px'
var w = NaNpx

要解决此问题,请设置图像的初始高度:

.taller img  {
    -webkit-transition: .3s ease-in-out;
    transition: .3s ease-in-out;
    height: 500px;
}

解决方案2:

您可以在if中添加以下controller阻止。

if(img.height===0 && img.width ===0){
            var h = '500px';     
            return {
                "height": h
            }
    }

Working Demo

希望能解决你的问题。

答案 1 :(得分:0)

试试这个。 create $ scope.tablet = {};对象first.and将ng-class更改为span标记的类。

&#13;
&#13;
var app = angular.module("app",[])
app.controller('ctrl',['$scope', function($scope){
   $scope.tablet ={};
  $scope.tablet.title = 'help';
    $scope.tablet.created = Date.now();;
    $scope.tablet.src = 'http://tallclub.co.uk/wp-content/uploads/2011/04/Tall-Person-1.png'
    
		$scope.set_ratio = function (it) { //Find ratio and return style so that it can be used for zoom effect. 
    
        console.log(it);
        var img = new Image();  
        img.src = it.tablet.src;
        console.log(it.tablet)

        if(img.height>img.width){
            var h = 300*(img.height/img.width)+'px'     
            return {'height':h};
        }else{
            var w = 300*(img.width/img.height)+'px'     
            return {
                'width':w 
            }       
        }
    }

}]);
&#13;
.taller img  {
    -webkit-transition: .3s ease-in-out;
    transition: .3s ease-in-out;

}
.taller img:hover  {
    -webkit-transition: .3s ease-in-out;
    transition: .3s ease-in-out;

    height: 300px !important;
}  

figure  {
	width: 300px;
	height: 300px;
	
	//height: 200px;
	margin: 1em;
	padding: 0;
	background: #fff;
	overflow: hidden;
	border: 1px solid #222;
	
}
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.22/angular.min.js"></script>
<div ng-app="app" ng-controller="ctrl">
<div >
   <h2>ARGH</h2>
     <div>
      <span class="taller">
         <figure>
           <img ng-mouseenter="set_ratio(this)" draggable="true" class="thumb" id="{{tablet.created}}" title="{{ tablet.title }}" data-ng-  src={{tablet.src}} />
         </figure>
      </span>
   </div>
  </div>
</div>
&#13;
&#13;
&#13;

答案 2 :(得分:0)

答案可以在这里找到。

is there a post render callback for Angular JS directive?

我只是把它包裹在$ timeout

<img ng-src="addProfileController.cropImgSrc">