I just started with Angular a couple days ago so simple stuff still occasionally gets the best of me. I'm trying to show the current character count of a textarea. I thought surely this should work:
我刚刚开始使用Angular几天前这么简单的东西偶尔会让我感觉最好。我正在尝试显示textarea的当前字符数。我当然认为这应该有效：
<textarea ng-model="mystring"></textarea>
<br>
<span> {{mystring.length()}} </span>
It doesn't work at all.. But why? And how do I accomplish this?
它根本不起作用..但为什么呢？我该如何做到这一点？
If I remove ".length()" the content of the textarea is showing up like it should so the binding is obviously working...
如果我删除“。length（）”，textarea的内容就会显示出来，因此绑定显然正在工作......
EDIT: So it works in chrome etc but not in IE, or more specifically, the embedded browser control in a .Net winform. hooray.
编辑：所以它适用于Chrome等，但不适用于IE，或更具体地说，是.Net winform中的嵌入式浏览器控件。万岁。
2 个解决方案
#1
20
The length of a string is a property in javascript. So this should work
字符串的长度是javascript中的属性。所以这应该工作
<span> {{mystring.length}} </span>
#2
1
The .Net browser control acts like IE7 by default so lots of things don't really work. In an attempt to remedy this I added a registry entry as indicated in this MSDN article to force the browser to act like IE9 but still had the same problem with string.length in the expression as well as a new "object doesn't support this action" error being thrown.
.Net浏览器控件默认情况下就像IE7一样，所以很多东西都不起作用。为了解决这个问题，我添加了一个注册表项，如本MSDN文章中所示，强制浏览器像IE9一样工作，但仍然在表达式中遇到与string.length相同的问题以及新的“对象不支持这个行动“抛出错误。
At this point I gave up and decided to use this WebKitdotNet control. It adds 30 or so MB to my install size but it actually works without having to change a lot of javascript or muck about in the registry.
此时我放弃了并决定使用这个WebKitdotNet控件。它增加了30个左右的MB到我的安装大小，但它实际上工作，而无需在注册表中更改大量的javascript或muck。
#1
20
The length of a string is a property in javascript. So this should work
字符串的长度是javascript中的属性。所以这应该工作
<span> {{mystring.length}} </span>
#2
1
The .Net browser control acts like IE7 by default so lots of things don't really work. In an attempt to remedy this I added a registry entry as indicated in this MSDN article to force the browser to act like IE9 but still had the same problem with string.length in the expression as well as a new "object doesn't support this action" error being thrown.
.Net浏览器控件默认情况下就像IE7一样，所以很多东西都不起作用。为了解决这个问题，我添加了一个注册表项，如本MSDN文章中所示，强制浏览器像IE9一样工作，但仍然在表达式中遇到与string.length相同的问题以及新的“对象不支持这个行动“抛出错误。
At this point I gave up and decided to use this WebKitdotNet control. It adds 30 or so MB to my install size but it actually works without having to change a lot of javascript or muck about in the registry.
此时我放弃了并决定使用这个WebKitdotNet控件。它增加了30个左右的MB到我的安装大小，但它实际上工作，而无需在注册表中更改大量的javascript或muck。