dongyue1988 2014-09-15 23:44
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运行时错误:带有模板的martini中无效的内存地址或nil指针取消引用

here is my code :

m.Get("/", func(r render.Render) string {
    t := template.New("some template")
    toto := "titi"
    templateh := "<html>Hello world! {{ toto }} <form name='input' action='../first' method='post' ><input type='texte' name='toto'><input type='submit' value='Submit'></form></html>"
    t, _ = t.Parse(templateh)
    var doc bytes.Buffer
    err := t.Execute(&doc, toto)
    if err != nil {
        fmt.Println("There was an error:", err)
    }
    s := doc.String()
    fmt.Println(s)

    return s

})

and it returns me a runtime error: invalid memory address or nil pointer dereference

and i don't understand why ...

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1条回答 默认 最新

  • dongtui8593 2014-09-16 00:22
    关注

    The call

        t, _ = t.Parse(templateh)
    

    returns the nil and error an error stating that the function "todo" is not defined. The template Execute method dereferences the nil pointer, resulting in the panic.

    You should change two things:

    • Check and handle the error return from the parse call. This is a good place to use the template.Must helper function.
    • Fix the template by replacing {{ todo }} with {{.}}
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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