废话不多说了，直接给大家贴代码了，具体代码如下所示：
<input type="file" ng-file-select="onFileSelect($files)" accept="image/*">
app.factory("fileReader", function($q, $log) {
var onLoad = function(reader, deferred, scope) {
return function () {
scope.$apply(function () {
deferred.resolve(reader.result);
});
};
};
var onError = function (reader, deferred, scope) {
return function () {
scope.$apply(function () {
deferred.reject(reader.result);
});
};
};
var onProgress = function(reader, scope) {
return function (event) {
scope.$broadcast("fileProgress",
{
total: event.total,
loaded: event.loaded
});
};
};
var getReader = function(deferred, scope) {
var reader = new FileReader();
reader.onload = onLoad(reader, deferred, scope);
reader.onerror = onError(reader, deferred, scope);
reader.onprogress = onProgress(reader, scope);
return reader;
};
var readAsDataURL = function (file, scope) {
var deferred = $q.defer();
var reader = getReader(deferred, scope);
reader.readAsDataURL(file);
return deferred.promise;
};
return {
readAsDataUrl: readAsDataURL
};
});
选择图片后执行的方法
$scope.onFileSelect = function(files) {
var fileIn=files[0];
var img = new Image();
var fileType = fileIn.name.substring(fileIn.name.lastIndexOf(".") + 1, fileIn.name.length);
if(fileIn.size>5242880){//单位是B，此处不允许超过5M
alert("图片不能超过5M")
return;
}
if(fileType=='JPG' || fileType=='PNG' || fileType=='JPEG ' || fileType=='jpg' || fileType=='png' || fileType=='jpeg'){
}else{
alert("图片格式只支持:JPG,PNG,JPEG")
return;
}
fileReader.readAsDataUrl(fileIn, $scope)
.then(function(result) {
$scope.imageSrc = result;
console.log(img.width);
});
}
总结
以上所述是小编给大家介绍的Angularjs实现上传图片预览功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对北冥有鱼网站的支持！
