Google Document Viewer shows "No Preview Available"

I have used Google Document Viewer to open PDF files in my Android device. A black screen with "No Preview Available" text is shown, instead of opening my PDF files. I have tested with sample PDF files from Google. They are working fine, but not my PDF files. Is there anything that i need to do from code side to view my PDF. http://docs.google.com/viewer?url=myurl.pdf Had a file t

Google文档查看器显示“无法预览”

我已使用Google文档查看器在我的Android设备中打开PDF文件。 显示“No Preview Available”文本的黑色屏幕,而不是打开我的PDF文件。 我已经使用Google的样本PDF文件进行了测试。 他们工作正常,但不是我的PDF文件。 有没有什么我需要从代码端来查看我的PDF。 http://docs.google.com/viewer?url=myurl.pdf 有一个文件显示这个问题。 将其重命名为删除文件名中的空白,更新了我的链接,并且工作正常。 请注意 ,空格被正确

Determine a User's Timezone

Is there any standard way for a Web Server to be able to determine a user's timezone within a web page? Perhaps from a HTTP header or part of the user-agent string? -new Date().getTimezoneOffset()/60; getTimezoneOffset() will subtract your time from GMT and return the number of minutes. So if you live in GMT-8, it will return 480. To put this into hours, divide by 60. Also, notice that th

确定用户的时区

Web Server是否有任何标准的方法能够确定用户在网页中的时区? 也许从HTTP头或用户代理字符串的一部分? -new Date().getTimezoneOffset()/60; getTimezoneOffset()会从GMT中减去你的时间并返回分钟数。 因此,如果你住在格林尼治标准时间8时,它将返回480.把这个数字除以60分钟。另外,请注意这个标志与你所需要的相反 - 它计算的是GMT时差与你所在时区的偏移量,而不是你的时差时区与GMT的偏移。 要解决这个问题,只需乘

AngularJS parent directive communicate with child directive

Consider two nested directives with isolate scopes: <dctv1> <dctv2></dctv2> <dctv1> If I want dctv2 to talk to dctv1 I have may options: I may require the controller of dctv1 in the definition of dctv2 using the require:'^dctv1' I may call an expression on the parent scope with the wrapper <dctv2 callParent="hello()"></dctv2> and sco

AngularJS父指令与子指令进行通信

考虑两个使用隔离作用域的嵌套指令: <dctv1> <dctv2></dctv2> <dctv1> 如果我想dctv2谈dctv1我有可能会选择: 我可能需要的控制器dctv1中的定义dctv2使用require:'^dctv1' 我可以用包装器<dctv2 callParent="hello()"></dctv2>和scope:{callParent:'&'}来调用父范围的表达式 我也可以使用$scope.$emit在dctv2 $scope.$emit ,但是所有的父范围

how can I make a copy of deeply nested state?

This question already has an answer here: How do I correctly clone a JavaScript object? 54 answers There are a couple of options: Use the update immutability helper which has some excellent docs on the React site, Use a package like clone which is optimised for this kind of thing. I'd recommend the first as the syntax is particularly powerful, especially when dealing with large str

我怎样才能做一个深度嵌套状态的副本?

这个问题在这里已经有了答案: 我如何正确克隆一个JavaScript对象? 54个答案 有几个选项: 使用React站点上有一些优秀文档的update不可变助手, 使用一个像克隆这样的软件包,为这种事情做了优化。 我推荐第一个,因为语法特别强大,特别是在处理像Redux商店这样的大型结构时。 作为文档的一个例子: import update from 'immutability-helper'; const newData = update(myData, { x: {y: {z: {$set: 7}}}, a

how to make a copy of object in javascript/vuejs

This question already has an answer here: How do I correctly clone a JavaScript object? 54 answers You are not creating a copy. You are assigning the reference to this.items to your itemsCopy array. Thus, you are later mutating the same array. Create a copy with: itemsCopy = this.items.slice(); The same issue applies with each object inside your array. In your loop, create a copy of t

如何在javascript / vuejs中创建对象的副本

这个问题在这里已经有了答案: 我如何正确克隆一个JavaScript对象? 54个答案 您没有创建副本。 您正在将this.items的引用分配给itemsCopy数组。 因此,您稍后将对相同的数组进行变异。 创建一个副本: itemsCopy = this.items.slice(); 数组内的每个对象都有同样的问题。 在你的循环中,创建一个对象的副本: var obj = Object.assign({}, itemsCopy[i]); obj.text = "something"; itemsCopy[i] = obj; //replace

How can I make a copy of an object in JavaScript?

This question already has an answer here: How do I correctly clone a JavaScript object? 54 answers You will have to map each property to the new array: Simple one level clone can be made like this: function clone(a, b) { var prop; for( prop in b ) { b[prop] = a; } } This will clone all properties from b to a . But keep all other properties in a : var a = {a: 9, c: 1

我怎样才能在JavaScript中制作一个对象的副本?

这个问题在这里已经有了答案: 我如何正确克隆一个JavaScript对象? 54个答案 您将不得不将每个属性映射到新数组: 简单的一级克隆可以这样做: function clone(a, b) { var prop; for( prop in b ) { b[prop] = a; } } 这将克隆从b到a所有属性。 但请所有其他属性a : var a = {a: 9, c: 1}, b = {a: 1, b: 1}; copy(a, b); // {a: 1, b: 1, c: 1} 深克隆对象: 上面的例子在处理单个级

Object.Freeze Javascript

This question already has an answer here: What is the most efficient way to deep clone an object in JavaScript? 57 answers How do I correctly clone a JavaScript object? 54 answers I believe you're misunderstanding the concept of references in javascript. Objects are referenced in javascript, so when you do const b = a; basically you are assigning b a value of the reference a , in o

Object.Freeze Javascript

这个问题在这里已经有了答案: 在JavaScript中深入克隆对象的最有效方法是什么? 57个答案 我如何正确克隆一个JavaScript对象? 54个答案 我相信你误解了JavaScript中引用的概念。 对象在JavaScript中引用,所以当你这样做 const b = a; 基本上,你为b分配了一个参考值a ,为了让你的代码正常工作,并实际上像你打算的那样“复制”,你需要克隆不通过引用的对象。 您可以使用Object.assign({}, ...)将对象克隆为新对

Cloning JSON not working as expected

This question already has an answer here: How do I correctly clone a JavaScript object? 54 answers When you do: var json_2 = json_1 you're actually not "cloning" the object you're merely aliasing it. So all operation on json_1 will be mirrored on json_2 and vice versa. To really clone your object take a look at: https://stackoverflow.com/a/728694/2003420

克隆JSON不按预期工作

这个问题在这里已经有了答案: 我如何正确克隆一个JavaScript对象? 54个答案 当你这样做时: var json_2 = json_1 你实际上并不是“克隆”你只是在别名的对象。 因此,json_1上的所有操作都将在json_2上镜像,反之亦然。 要真正克隆您的对象,请参阅:https://stackoverflow.com/a/728694/2003420

Ecma6, Object.assign doesn't do a deep copy

This question already has an answer here: How do I correctly clone a JavaScript object? 54 answers First I want to tell you that it's not bulletproof solution(in case of date object). If you want "right" as answer,here is your solution ` var dst,src = { "edf" : {"zyx" : "right"}}; dst=JSON.parse(JSON.stringify(src)); dst["a"] = 1; src.edf.zyx = "wrong"; console.log(src,dst);

Ecma6,Object.assign不会执行深层复制

这个问题在这里已经有了答案: 我如何正确克隆一个JavaScript对象? 54个答案 首先,我想告诉你,这不是防弹解决方案(在日期对象的情况下)。 如果你想“正确”作为答案,这里是你的解决方案` var dst,src = { "edf" : {"zyx" : "right"}}; dst=JSON.parse(JSON.stringify(src)); dst["a"] = 1; src.edf.zyx = "wrong"; console.log(src,dst); `所以请阅读这些链接以更好地理解深层复制 最优雅的克隆JavaScript对象的方

Object.assign keeps reference to original object

This question already has an answer here: How do I correctly clone a JavaScript object? 54 answers In fact this can be done in different ways: Implement you own if you don't want external import, but take in consideration nested object. I implemented my own as follow (in case you have a nested object you need deep clone, so set deep=true ): function cloneObj(obj, deep=false){ var r

Object.assign保持对原始对象的引用

这个问题在这里已经有了答案: 我如何正确克隆一个JavaScript对象? 54个答案 事实上,这可以通过不同的方式完成: 如果您不想进行外部导入,请考虑嵌套对象。 我实现了我自己的如下(如果你有一个嵌套对象需要深度克隆,那么设置deep=true ): function cloneObj(obj, deep=false){ var result = {}; for(key in obj){ if(deep && obj[key] instanceof Object){ if(obj[key] instanceof Array)