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How to Access Struct Fields of Map Elements in HTML Templates Using Go\'s html/template Package?

DDDOriginal: 2024-10-24 07:34:30255browse

How to Access Struct Fields of Map Elements in HTML Templates Using Go's html/template Package?

Retrieving Struct Field of Map Element in HTML/Template's Go Package

Situation:

You have a struct and a map using the struct as a value. You desire to access the struct's fields within an HTML page rendered using the html/template package.

Solution:

To enable access to the struct's fields within the template, they must be exported. Exporting a field entails beginning its name with an uppercase letter.

Detailed Explanation:

<code class="go">type Task struct {
   cmd string
   args []string
   Desc string // Exported field
}</code>

Notice the uppercase 'D' in Desc.

Similarly, update the map and template references:

<code class="go">var taskMap = map[string]Task{
    "find": Task{
        cmd: "find",
        args: []string{"/tmp/"},
        Desc: "find files in /tmp dir",
    },
    "grep": Task{
        cmd: "grep",
        args:[]string{"foo","/tmp/*", "-R"},
        Desc: "grep files match having foo",
    },
}</code>

<code class="html">{{range $key, $value := .}}
   <li>Task Name:        {{$key}}</li>
   <li>Task Value:       {{$value}}</li>
   <li>Task description: {{$value.Desc}}</li>
{{end}}</code>

Results:

The output will contain the Desc field for each task:

<code class="html"><html>

<li>Task Name:        find</li>
<li>Task Value:       {find [/tmp/] find files in /tmp dir}</li>
<li>Task description: find files in /tmp dir</li>

<li>Task Name:        grep</li>
<li>Task Value:       {grep [foo /tmp/* -R] grep files match having foo}</li>
<li>Task description: grep files match having foo</li>

</html></code>

Note: This solution exports the entire struct, so consider using a defined template function if you only need specific fields.

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