英文:
Go HTML templates: Can I stop the templates package inserting quotes around strings in scripts?
问题
我明白你的问题。你想在模板的正文中输出与图像关联的根URL，但是当你这样做时，模板包会尝试在其周围加上引号。你想知道是否有解决这个问题的方法。
根据你提供的代码，我看到你使用了template.JSStr函数来将根URL转换为JavaScript字符串。这可能导致在输出时添加引号。为了解决这个问题，你可以尝试使用template.URL类型来表示根URL，而不是使用template.JSStr。
修改Data结构体的定义，将IMG_ROOT的类型更改为template.URL，如下所示：
type Data struct {
IMG_ROOT template.URL
}
然后，在main函数中，将template.JSStr替换为template.URL，如下所示：
t.Execute(os.Stdout, &Data{template.URL("/path/to/file")})
这样修改后，模板输出中的根URL将不再被包裹在引号中。
希望这可以解决你的问题！如果还有其他疑问，请随时提问。
英文:
All of my templates have a variable indicating the root url of their associated images. I want to output that root before the filename of the image in the body of the template, but when I do so, the templates package attempts to put quotes around it. Here's a minimal piece of code that shows my problem. IMG_ROOT is an interface in this example to better simulate the real code. The script type is text/template because its contents will be used in an underscore.js template. The type doesn't appear to matter to how it's output though.
package main
import (
"html/template"
"os"
)
type Data struct {
IMG_ROOT interface{}
}
const tmpl = `
<body>
<script type="text/template">
<img src="{{.IMG_ROOT}}/file_name.jpg"></img>
</script>
</body>
`
func main() {
t, _ := template.New("").Parse(tmpl)
t.Execute( os.Stdout, &Data{ template.JSStr( "/path/to/file" ) } )
}
http://play.golang.org/p/wg9JK2w2lt
If I write <img src="{{.IMG_ROOT}}/file_name.jpg"></img>, I get "\/path\/to\/file/file_name.jpg" which isn't valid.
If I write <img src={{.IMG_ROOT}}/file_name.jpg></img>, I get "/path/to/file/"file_name.jpg which doesn't work either.
Is there a workaround for this? I've tried using every 'safe' type from the templates package for the IMG_ROOT type, but haven't had any luck. I could just write a function that concatenates and returns the root and file, but it seems like there should be a simpler solution.
Any ideas?
Thanks!
答案1
得分: 5
你可以使用内置的printf函数：
<img src={{printf "%s/file_name.jpg" .IMG_ROOT}}></img>
但是，我建议创建一个自定义的辅助函数，并使用它来创建这样的路径：
const ImageRoot = "path/to/files/"
func StaticFile(filename string) string {
return ImageRoot + filename
}
func main() {
t, _ := template.New("").Funcs(template.FuncMap{"staticFile": StaticFile}).Parse(tmpl)
t.Execute(os.Stdout, nil)
}
然后在你的模板中，你可以这样做：
<img src="{{staticFile "image.jpg"}}"></img>
英文:
You could use printf built-in function:
<img src={{printf "%s/file_name.jpg" .IMG_ROOT}}></img>
http://play.golang.org/p/2v8Q6wHu0r
But instead, I would recommend creating a custom helper function and use it to create such paths:
const ImageRoot = "path/to/files/"
func StaticFile(filename string) string {
return ImageRoot + filename
}
func main() {
t, _ := template.New("").Funcs(template.FuncMap{"staticFile": StaticFile}).Parse(tmpl)
t.Execute(os.Stdout, nil)
}
And then in your templates you can just do
<img src="{{staticFile "image.jpg"}}"></img>
答案2
得分: 1
这是因为html/template会对内容进行转义，以防止攻击等问题。我遇到了类似的问题，后来切换到text/template后，模板的行为符合预期。不过，我会使用其他方法来获取所需的输出，并继续使用html/template。
英文:
It's because html/template escapes things to prevent attacks, etc. I came to this question with a similar problem. Switching to text/template made my template behave as expected. That said, I'll just use another method to get the output I need and continue to use html/template.
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