我试图在 type 为 file 的 input 标签上使用 ng-model:
<input type="file" ng-model="vm.uploadme" />
但是在选择文件后,在控制器中,$scope.vm.uploadme仍然未定义。
我该如何在控制器中获取所选文件?
我试图在 type 为 file 的 input 标签上使用 ng-model:
<input type="file" ng-model="vm.uploadme" />
但是在选择文件后,在控制器中,$scope.vm.uploadme仍然未定义。
我该如何在控制器中获取所选文件?
我使用指令创建了一个解决方法:
.directive("fileread", [function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
var reader = new FileReader();
reader.onload = function (loadEvent) {
scope.$apply(function () {
scope.fileread = loadEvent.target.result;
});
}
reader.readAsDataURL(changeEvent.target.files[0]);
});
}
}
}]);
然后输入标签变为:
<input type="file" fileread="vm.uploadme" />
或者只需要文件定义:
.directive("fileread", [function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
scope.$apply(function () {
scope.fileread = changeEvent.target.files[0];
// or all selected files:
// scope.fileread = changeEvent.target.files;
});
});
}
}
}]);
我使用这个指令:
angular.module('appFilereader', []).directive('appFilereader', function($q) {
var slice = Array.prototype.slice;
return {
restrict: 'A',
require: '?ngModel',
link: function(scope, element, attrs, ngModel) {
if (!ngModel) return;
ngModel.$render = function() {};
element.bind('change', function(e) {
var element = e.target;
$q.all(slice.call(element.files, 0).map(readFile))
.then(function(values) {
if (element.multiple) ngModel.$setViewValue(values);
else ngModel.$setViewValue(values.length ? values[0] : null);
});
function readFile(file) {
var deferred = $q.defer();
var reader = new FileReader();
reader.onload = function(e) {
deferred.resolve(e.target.result);
};
reader.onerror = function(e) {
deferred.reject(e);
};
reader.readAsDataURL(file);
return deferred.promise;
}
}); //change
} //link
}; //return
});
并像这样调用它:
<input type="file" ng-model="editItem._attachments_uri.image" accept="image/*" app-filereader />
属性(editItem.editItem._attachments_uri.image)将会被选定文件的内容以data-uri(base64编码)的形式填充。
请注意,此脚本不会上传任何内容。它只会将您的文件内容作为数据uri(base64编码)填充到模型中。
在这里查看一个工作示例: http://plnkr.co/CMiHKv2BEidM9SShm9Vv
ngModel
的 $render
函数的目的是什么? - sp00m<input type="file">
与ng-model
一起使用ng-model
一起工作的指令演示核心指令ng-model
默认不支持<input type="file">
。
这个自定义指令可以启用ng-model
,并且还能让ng-change
、ng-required
和ng-form
指令与<input type="file">
一起使用。
angular.module("app",[]);
angular.module("app").directive("selectNgFiles", function() {
return {
require: "ngModel",
link: function postLink(scope,elem,attrs,ngModel) {
elem.on("change", function(e) {
var files = elem[0].files;
ngModel.$setViewValue(files);
})
}
}
});
<script src="//unpkg.com/angular/angular.js"></script>
<body ng-app="app">
<h1>AngularJS Input `type=file` Demo</h1>
<input type="file" select-ng-files ng-model="fileArray" multiple>
<code><table ng-show="fileArray.length">
<tr><td>Name</td><td>Date</td><td>Size</td><td>Type</td><tr>
<tr ng-repeat="file in fileArray">
<td>{{file.name}}</td>
<td>{{file.lastModified | date : 'MMMdd,yyyy'}}</td>
<td>{{file.size}}</td>
<td>{{file.type}}</td>
</tr>
</table></code>
</body>
$scope.uploadme = {};
$scope.uploadme.src = "";
在HTML中:
<input type="file" fileread="uploadme.src"/>
<input type="text" ng-model="uploadme.src"/>
指令没有任何更改。
现在,一切都像预期的那样工作。我可以使用 $scope.uploadme 从我的控制器中获取 uploadme.src 的值。
$scope.uploadme = { src: '' }
- maxathousand{
"lastModified": 1438583972000,
"lastModifiedDate": "2015-08-03T06:39:32.000Z",
"name": "gitignore_global.txt",
"size": 236,
"type": "text/plain",
"data": "data:text/plain;base64,DQojaWdub3JlIHRodW1ibmFpbHMgY3JlYXRlZCBieSB3aW5kb3dz…xoDQoqLmJhaw0KKi5jYWNoZQ0KKi5pbGsNCioubG9nDQoqLmRsbA0KKi5saWINCiouc2JyDQo="
}
<myUpload key="file"></myUpload>
指令:
.directive('myUpload', function() {
return {
link: function postLink(scope, element, attrs) {
element.find("input").bind("change", function(changeEvent) {
var reader = new FileReader();
reader.onload = function(loadEvent) {
scope.$apply(function() {
scope[attrs.key] = loadEvent.target.result;
});
}
if (typeof(changeEvent.target.files[0]) === 'object') {
reader.readAsDataURL(changeEvent.target.files[0]);
};
});
},
controller: 'FileUploadCtrl',
template:
'<span class="btn btn-success fileinput-button">' +
'<i class="glyphicon glyphicon-plus"></i>' +
'<span>Replace Image</span>' +
'<input type="file" accept="image/*" name="files[]" multiple="">' +
'</span>',
restrict: 'E'
};
});
使用lodash或underscore进行多文件输入:
.directive("fileread", [function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
return _.map(changeEvent.target.files, function(file){
scope.fileread = [];
var reader = new FileReader();
reader.onload = function (loadEvent) {
scope.$apply(function () {
scope.fileread.push(loadEvent.target.result);
});
}
reader.readAsDataURL(file);
});
});
}
}
}]);
function filesModelDirective(){
return {
controller: function($parse, $element, $attrs, $scope){
var exp = $parse($attrs.filesModel);
$element.on('change', function(){
exp.assign($scope, this.files[0]);
$scope.$apply();
});
}
};
}
app.directive('filesModel', filesModelDirective);
我需要在多个输入上执行相同的操作,因此我更新了@Endy Tjahjono的方法。它返回一个包含所有已读文件的数组。
.directive("fileread", function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
var readers = [] ,
files = changeEvent.target.files ,
datas = [] ;
for ( var i = 0 ; i < files.length ; i++ ) {
readers[ i ] = new FileReader();
readers[ i ].onload = function (loadEvent) {
datas.push( loadEvent.target.result );
if ( datas.length === files.length ){
scope.$apply(function () {
scope.fileread = datas;
});
}
}
readers[ i ].readAsDataURL( files[i] );
}
});
}
}
});
.directive("fileread", function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
var readers = [] ,
files = changeEvent.target.files ,
datas = [] ;
if(!files.length){
scope.$apply(function () {
scope.fileread = [];
});
return;
}
for ( var i = 0 ; i < files.length ; i++ ) {
readers[ i ] = new FileReader();
readers[ i ].index = i;
readers[ i ].onload = function (loadEvent) {
var index = loadEvent.target.index;
datas.push({
lastModified: files[index].lastModified,
lastModifiedDate: files[index].lastModifiedDate,
name: files[index].name,
size: files[index].size,
type: files[index].type,
data: loadEvent.target.result
});
if ( datas.length === files.length ){
scope.$apply(function () {
scope.fileread = datas;
});
}
};
readers[ i ].readAsDataURL( files[i] );
}
});
}
}
});