如果value为0，则输入值将为空，否则为value

Question

Problem: I have created a simple form, where there's an input field "num". After submission I want to show the value of num in the same input field, in other words want to retain the input in that field. If the value was set to 0 then I want to ignore that.

I can do it in several languages but I'm not sure about how to do it in Golang. My current template file has,

<input type="text" placeholder="foo" name="bar" value="{{if gt .N 0 }} {{.N}} {{end}} "/> 

Server file contains:

data := &listOfReport {
        R: r,
        I: i,
        N: n
}
listTmpl := template.Must(template.New("list_tmpl").Parse(string(report.Template["xxx.tmpl"])))
if err := listTmpl.Execute(w, data); err != nil {
    http.Error(w, fmt.Sprintf("Error rendering template %v", err), 500)
}

Another thought is to make N a string so make it '' or value in the server file. But that actually spoils the variable's name/purpose.

Is there any better way to do it? Is ther any better way to access GET parameters directly from template? Please note that the value of N is originally got from a GET variable.

*This code is not tested

Answer 1

There is no standard/builtin way to get any request parameters from within a template, you'll have to put it into your data. (You could write a function which does this for you, but that will result in an ugly hack.)

I don't see what's wrong with your solution.