Currently I am having an issue related to assign a Golang variable to a Javascript variable. I am using the Golang templates, so, from the backend I sent a JSON variable, just like this:
var c []models.C b, _ := json.Marshal(c) err = tpl.ExecuteTemplate(w, "index.gohtml",string(b))
As you see, I have a slice, convert it to Json and then that Json to string, and send it to the template. Then, in the frontend I need to assign that to a variable, and it should be valid JSON, I have this:
var rowData = {{.}};
But, I am getting SyntaxError: expected property name, got '{'
So, my question is: How should I assign that JSON?
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Answer
First, you must use the html/template
instead of text/template
, as the former provides context-sensitive escaping.
Second, in the template the context must be clear that it is JavaScript code, e.g. it must be inside HTML <script>
tag.
See this working example:
type Point struct { Name string X, Y int } func main() { t := template.Must(template.New("").Parse(src)) p := Point{"Center", 100, 200} pj, err := json.Marshal(p) if err != nil { panic(err) } if err = t.Execute(os.Stdout, string(pj)); err != nil { panic(err) } } const src = `<script> var point = {{.}}; alert(point); </script>`
Output (try it on the Go Playground):
<script> var point = "{"Name":"Center","X":100,"Y":200}"; alert(point); </script>
As you can see, the point
JavaScript variable contains a valid JSON text (a JavaScript Object), properly escaped.