到目前为止,我正在使用meteor框架构建一个有角度的离子应用程序,但我正在尝试使用$ apply方法更新我的范围,这不是更新我的范围,这是我的代码。更具体地说,用户在上传图像后调用addAvatar function(),它使用fileReader API将图像转换为base64对象。反过来必须使用$ apply分配给 editProfileController.cropImgSrc ,但它没有发生。
我正在尝试更新editProfileController.cropImgSrc的范围
模板(指令)
sym.And()
控制器
<ion-view view-title="Profile Edit">
<div class="bar bar-header bar-positive">
<h1 class="title">edit your profile</h1>
</div>
<ion-content overflow-scroll="true" class="has-header">
<h4 style="color:#212121;font-family: 'proxima',sans-serif;">Edit profile</h4>
<div class="row row-center">
<div class="col col-25">
<div>
{{editProfileController.cropImgSrc}}
</div>
</div>
<div class="col">
<div class="button button-outline button-positive" ngf-select
ngf-change="editProfileController.addAvatar($files)"
ngf-multiple="false" ngf-allow-dir="false" ngf-accept="'image/*'"
ngf-drop-available="false">
edit my display picture
</div>
</div>
</div>
<div class="list">
<div class="list">
<label class="item item-input">
<span class="input-label">your name</span>
<input type="text" ng-model="editProfileController.profile.name">
</label>
<label class="item item-input">
<span class="input-label">your birthday</span>
<input type="date" ng-model="editProfileController.profile.birthday">
</label>
<label class="item item-input item-select">
<div class="input-label">
Gender
</div>
<select ng-model="editProfileController.profile.gender">
<option selected>Female</option>
<option>Male</option>
<option>Others</option>
</select>
</label>
</div>
<h5 style="color:#212121;font-family: 'proxima',sans-serif;" class="padding">Add a short Bio about you, Keep it interesting and simple!</h5>
<label class="item item-input">
<span class="input-label">Bio</span>
<input type="text" placeholder="I am a storm trooper, fighting at star wars." ng-model="editProfileController.profile.bio">
</label>
<br>
<div class="row padding">
<div class="col">
<button class="button button-outline button-positive button-block">
save my profile
</button>
</div>
</div>
</div>
</ion-content>
});
解决方案 将此附加到控制器定义上方的vm, var vm = this;
答案 0 :(得分:0)
发生错误是因为this
方法调用中$scope.$apply
的上下文发生了变化。
请参阅:this
context within an event handler
一个简单的解决方法是将this
的上下文保存在控制器定义顶部的变量中:
controller: function($scope,$reactive){
// save context of this in a variable
var vm = this;
$reactive(this).attach($scope);
this.helpers({
cropImgSrc: function(){
return ' ';
}
});
this.addAvatar = function(files){
if (files.length > 0) {
var reader = new FileReader();
reader.onload = function(e) {
$scope.$apply(function(){
// vm still refers to the controller here
vm.cropImgSrc = e.target.result;
});
};
reader.readAsDataURL(files[0]);
}
else {
this.cropImgSrc = undefined;
}
};
}