javascript 通过javascript访问把手变量
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Accessing handlebars variable via javascript
提问by PokeRwOw
I'm generating a handlebars view for express js framework, and I need to access the variables I pass to the view from inside a separate JavaScript file.
我正在为 express js 框架生成一个把手视图，我需要访问我从单独的 JavaScript 文件中传递给视图的变量。
For example:
例如：
var foo = {{user.name}}
Someone got an idea? Helper?
有人有想法吗？帮手？
回答by Jonathan Lonowski
The value of user.nameneeds to be output as a valid JavaScript expression if you want to include it in within a <script>, which will be reevaluating it as code.
的值user.name需要尽可能有效的JavaScript表达式输出，如果你想将其包括在内的<script>，将被重新评估它的代码。
Currently, if user.nameis "john.doe"for example, the resulting script will be:
目前，如果user.name是"john.doe"，例如，结果脚本将是：
var foo = john.doe; // `john` is treated as an object with a `doe` property
The user.nameat least needs to be in quotes so it's understood as a string value/literal.
该user.name至少需要加引号，所以它理解为一个字符串值/文本。
var foo = "{{user.name}}";
// result
var foo = "john.doe";
You can also take advantage of JSON and JavaScript's similarities in syntax, outputting JSON that JavaScript can understand as an Expression, and will already include the quotes.
您还可以利用 JSON 和 JavaScript 在语法上的相似性，将 JavaScript 可以理解的 JSON 输出为表达式，并且已经包含引号。
Handlebars.registerHelper('json', function (content) {
return JSON.stringify(content);
});
var foo = {{{json user.name}}};
// result
var foo = "john.doe";
Note the triple {{{...}}}in the last example to disable HTML encoding, so you don't end up with:
请注意{{{...}}}最后一个示例中的三元组禁用 HTML 编码，因此您不会得到：
var foo = "john.doe"
回答by Drkawashima
Node can pass encoded JSON to the handlebars-view like this:
节点可以像这样将编码的 JSON 传递给车把视图：
result.render('index', {
encodedJson : encodeURIComponent(JSON.stringify(jsonData))
});
The handlebars-view can decode and parse the json like so:
把手视图可以像这样解码和解析 json：
<script>
var decodedJson = decodeURIComponent("{{{encodedJson}}}");
var jsonObj = JSON.parse(decodedJson);
</script>
Since anything passed to a handlebars-view will basically be injected straight into HTML, you should always pass encoded json and let the view decode it.
由于传递给车把视图的任何内容基本上都会直接注入 HTML，因此您应该始终传递编码的 json 并让视图对其进行解码。
I tried the other suggestions in this thread. But they injected unencoded JSON into the handlebars view and that always gave me parsing errors. I have no idea how people got that to work, since it seems like Handlebars will parse variables as plain text.
我尝试了此线程中的其他建议。但是他们将未编码的 JSON 注入车把视图中，这总是给我解析错误。我不知道人们是如何让它工作的，因为 Handlebars 似乎会将变量解析为纯文本。
I have not read up on how the Handlebars parser works - but it seems to me the only safe option is to use encoded JSON, like how I suggest in my examples.
我还没有读过 Handlebars 解析器是如何工作的——但在我看来，唯一安全的选择是使用编码的 JSON，就像我在我的例子中所建议的那样。
