douleng0794 2015-02-24 15:21 采纳率: 0%
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如何使用Golang从表单中获取多选值？

I have a multiple select input in my form and I'm trying to get the selected values in my handler, but I can't, how can I get those values?

<form action="process" method="post">
    <select id="new_data" name="new_data class="tag-select chzn-done" multiple="" style="display: none;">
    <option value="1">111mm1</option>
    <option value="2">222mm2</option>
    <option value="3">012nx1</option>
    </select>
</form>

My Handler:

func myHandler(w http.ResponseWriter, r *http.Request) {
    fmt.Println(r.FormValue("new_data")) // result-> []
    fmt.Println(r.Form("new_data")) // result-> []
}

The form serialized data with option 1 and 2 selected from JS console:

   >$('#myform').serialize() 
   >"new_data=1&new_data=2"
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  • doujiaozhan4397 2015-02-24 15:50
    关注

    You can't/shouldn't use the Request.FormValue() function because that only returns 1 value. Use Request.Form["new_data"] which is a slice of strings containing all the values.
    But note that if you don't call r.FormValue(), you have to trigger parsing the form (and populating the Request.Form map) by calling Request.ParseForm() explicitly.

    You also have an HTML syntax error: the value of the name attribute is not closed, change it to:

    <select id="new_data" name="new_data" class="tag-select chzn-done"
    multiple="" style="display: none;">

    Here is a complete app to test that it works (error checks ommited!):

    package main

import (
    "fmt"
    "net/http"
)

func myHandler(w http.ResponseWriter, r *http.Request) {
    if r.Method == "POST" {
        // Form submitted
        r.ParseForm() // Required if you don't call r.FormValue()
        fmt.Println(r.Form["new_data"])
    }
    w.Write([]byte(html))
}

func main() {
    http.HandleFunc("/", myHandler)
    http.ListenAndServe(":9090", nil)
}

const html = `
<html><body>
<form action="process" method="post">
    <select id="new_data" name="new_data" class="tag-select chzn-done" multiple="" >
        <option value="1">111mm1</option>
        <option value="2">222mm2</option>
        <option value="3">012nx1</option>
    </select>
    <input type="Submit" value="Send" />
</form>
</body></html>
`
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

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