如何将变量传递给模板并在beego中接收变量

Question

My template file:

{{range $index, $option := .alternatives}}
<div id="splashAlternative{{$index}}" class="col-sm-2">
    <select id="flashSrc_{{$index}}">
    {{template "alternative_src.html" $option}}
    </select>
</div>
{{end}}

I want pass $option to template, and alternative_src.html code :

{{if compare .option ""}}
  <option value="" selected="selected">
  </option>
{{else}}
  <option value=""></option>
{{end}}
{{if compare .option "xxx"}}
  <option value="xxx" selected="selected">xxx</option>
{{else}}
  <option value="xxx">xxx</option>
{{end}}

but I get problem below:

executing "alternative_src.html" at <.option>: can't evaluate field option in type string

Answer 1

When you use the {{template}} action and you pass something, that becomes the dot . in the called template. Quoting from the package doc of text/template:

{{template "name" pipeline}}
    The template with the specified name is executed with dot set
    to the value of the pipeline.

So inside alternative_src.html refer to the option only as a dot . (the dot . will mean the value of the pipeline you passed to the template, which is $option in the caller template):

{{if compare . ""}}
  <option value="" selected="selected">
  </option>
{{else}}
  <option value=""></option>
{{end}}
{{if compare . "xxx"}}
  <option value="xxx" selected="selected">xxx</option>
{{else}}
  <option value="xxx">xxx</option>
{{end}}