如何在 Go 模板中访问数组的第一个索引的值 [英] How to access value of first index of array in Go templates
问题描述
所以我在使用它时有和 html 模板我得到了对象:
<div>Foobar {{ index .Doc.Users 0}}</div>
输出:
Foobar {MyName my@email.com}
我只想使用 Name
字段我已经尝试了很多次迭代都没有成功:
{{ index .Doc.Users.Name 0}}{{ index .Doc.Users 0 .Name}}{{ .Name 索引 .Quote.Clients 0}}...
仅获取数组中第一个元素的 .Name
字段 (.Doc.Users[0].Name
) 的正确语法是什么?
只需将表达式分组并应用 .Name
选择器:
<div>Foobar {{ (index .Doc.Users 0).Name }}</div>
这是一个可运行、可验证的示例:
type User struct {名称字符串电子邮件字符串}t := template.Must(template.New("").Parse(`<div>Foobar {{ (index .Doc.Users 0).Name }}</div>`))m := 地图[字符串]接口{}{文档":地图[字符串]接口{}{用户":[]用户{{姓名:鲍勃",电子邮件:bob@myco.com"},{姓名:爱丽丝",电子邮件:alice@myco.com"},},},}fmt.Println(t.Execute(os.Stdout, m))
输出(在 Go Playground 上试试):
<div>Foobar Bob</div><nil>
(最后的
是 template.Execute()
返回的错误值,表示执行模板没有错误.)
So I have and html template when using this I get the object:
<div>Foobar {{ index .Doc.Users 0}}</div>
Output:
<div>Foobar {MyName my@email.com}</div>
I just want to use the Name
field I have tried many iterations without success:
{{ index .Doc.Users.Name 0}}
{{ index .Doc.Users 0 .Name}}
{{ .Name index .Quote.Clients 0}}
...
What is the correct syntax for just getting .Name
field (.Doc.Users[0].Name
) of the first element in my array?
Simply group the expression and apply the .Name
selector:
<div>Foobar {{ (index .Doc.Users 0).Name }}</div>
Here's a runnable, verifiable example:
type User struct {
Name string
Email string
}
t := template.Must(template.New("").Parse(
`<div>Foobar {{ (index .Doc.Users 0).Name }}</div>`))
m := map[string]interface{}{
"Doc": map[string]interface{}{
"Users": []User{
{Name: "Bob", Email: "bob@myco.com"},
{Name: "Alice", Email: "alice@myco.com"},
},
},
}
fmt.Println(t.Execute(os.Stdout, m))
Output (try it on the Go Playground):
<div>Foobar Bob</div><nil>
(The <nil>
at the end is the error value returned by template.Execute()
, telling there were no errors executing the template.)
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