我是角的新手。我试图从HTML“文件”字段读取上传的文件路径，每当“更改”发生在这个字段上。如果我使用“onChange”，它可以工作，但当我以angular的方式使用“ng-change”时，它就不起作用了。
<script>
var DemoModule = angular.module("Demo",[]);
DemoModule .controller("form-cntlr",function($scope){
$scope.selectFile = function()
{
$("#file").click();
}
$scope.fileNameChaged = function()
{
alert("select file");
}
});
</script>
<div ng-controller="form-cntlr">
<form>
<button ng-click="selectFile()">Upload Your File</button>
<input type="file" style="display:none"
id="file" name='file' ng-Change="fileNameChaged()"/>
</form>
</div>
fileNameChaged()从不调用。Firebug也不会显示任何错误。
类似于这里的其他一些很好的答案，我写了一个指令来解决这个问题，但是这个实现更紧密地反映了附加事件的角度方式。
你可以像这样使用指令:
HTML
<input type="file" file-change="yourHandler($event, files)" />
如您所见，您可以将所选择的文件注入到事件处理程序中，就像您将$event对象注入到任何ng事件处理程序中一样。
Javascript
angular
.module('yourModule')
.directive('fileChange', ['$parse', function($parse) {
return {
require: 'ngModel',
restrict: 'A',
link: function ($scope, element, attrs, ngModel) {
// Get the function provided in the file-change attribute.
// Note the attribute has become an angular expression,
// which is what we are parsing. The provided handler is
// wrapped up in an outer function (attrHandler) - we'll
// call the provided event handler inside the handler()
// function below.
var attrHandler = $parse(attrs['fileChange']);
// This is a wrapper handler which will be attached to the
// HTML change event.
var handler = function (e) {
$scope.$apply(function () {
// Execute the provided handler in the directive's scope.
// The files variable will be available for consumption
// by the event handler.
attrHandler($scope, { $event: e, files: e.target.files });
});
};
// Attach the handler to the HTML change event
element[0].addEventListener('change', handler, false);
}
};
}]);
这是对其他一些模型的改进，数据将以ng模型结束，这通常是你想要的。
标记(只要创建一个属性数据文件，这样指令就可以找到它)
<input
data-file
id="id_image" name="image"
ng-model="my_image_model" type="file">
JS
app.directive('file', function() {
return {
require:"ngModel",
restrict: 'A',
link: function($scope, el, attrs, ngModel){
el.bind('change', function(event){
var files = event.target.files;
var file = files[0];
ngModel.$setViewValue(file);
$scope.$apply();
});
}
};
});
最简单的Angular jqLite版本。
JS:
.directive('cOnChange', function() {
'use strict';
return {
restrict: "A",
scope : {
cOnChange: '&'
},
link: function (scope, element) {
element.on('change', function () {
scope.cOnChange();
});
}
};
});
HTML:
<input type="file" data-c-on-change="your.functionName()">
类似于这里的其他一些很好的答案，我写了一个指令来解决这个问题，但是这个实现更紧密地反映了附加事件的角度方式。
你可以像这样使用指令:
HTML
<input type="file" file-change="yourHandler($event, files)" />
如您所见，您可以将所选择的文件注入到事件处理程序中，就像您将$event对象注入到任何ng事件处理程序中一样。
Javascript
angular
.module('yourModule')
.directive('fileChange', ['$parse', function($parse) {
return {
require: 'ngModel',
restrict: 'A',
link: function ($scope, element, attrs, ngModel) {
// Get the function provided in the file-change attribute.
// Note the attribute has become an angular expression,
// which is what we are parsing. The provided handler is
// wrapped up in an outer function (attrHandler) - we'll
// call the provided event handler inside the handler()
// function below.
var attrHandler = $parse(attrs['fileChange']);
// This is a wrapper handler which will be attached to the
// HTML change event.
var handler = function (e) {
$scope.$apply(function () {
// Execute the provided handler in the directive's scope.
// The files variable will be available for consumption
// by the event handler.
attrHandler($scope, { $event: e, files: e.target.files });
});
};
// Attach the handler to the HTML change event
element[0].addEventListener('change', handler, false);
}
};
}]);
