dongshan0202405 2017-03-26 15:07
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使用Go删除HTML下拉列表吗？

I'm using the package golang.org/x/net/html to scrape data out of HTML pages and this has been working fine so far. However, I don't know how to extract data from a drop-down list like this:

<!DOCTYPE html>
<html>
<body>

<select name="car" size="1" id="car">
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="vw">VW</option>
  <option value="audi" selected>Audi</option>
</select>

<select name="animal" size="1" id="animal">
  <option value="dog">Dog</option>
  <option value="cat" selected>Cat</option>
  <option value="badger">Badger</option>
  <option value="mouse">Mouse</option>
</select>

I want to extract the pre-selected options, so the result becomes this:

car = audi
animal = cat

How can I accomplish this? In case golang.org/x/net/html is not capable of doing what I want, what else can I do to extract the data?

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2条回答 默认 最新

  • duanbanfei2875 2017-03-26 15:25
    关注

    You absolutely can do it with "net/html":

    package main

import (
    "fmt"
    "golang.org/x/net/html"
    "strings"
)

func main() {
    s := "html"

    result := make(map[string]string)
    d := html.NewTokenizer(strings.NewReader(s))
    currID := ""
    for {
        tokenType := d.Next()
        if tokenType == html.ErrorToken {
            break
        }

        token := d.Token()
        switch tokenType {
        case html.StartTagToken:
            if token.Data == "select" {
                for _, a := range token.Attr {
                    if a.Key == "id" {
                        currID = a.Val
                    }
                }
            }
            if token.Data == "option" {
                isSelected := false
                for _, a := range token.Attr {
                    if a.Key == "selected" {
                        isSelected = true
                    }
                }
                if isSelected {
                    for _, a := range token.Attr {
                        if a.Key == "value" {
                            result[currID] = a.Val
                        }
                    }
                }
            }
        }
    }

    fmt.Printf("%v
", result)
}

    P.S. this code can be improved.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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