Question

Go HTML parsing package忽略输入标记并将其解释为表单标记的文本内容。绕过此限制的最佳选择是什么？

package main

import (
    "fmt"
    "strings"

    "golang.org/x/net/html"
)

const HTML = ` 
<!DOCTYPE html>
<html lang="en">
     <head>
        <meta charset="utf-8"/>
        <title>selected attribute</title>
    </head>
    <body>
        <form method="GET">
            <input type="submit" value="submit"/>
        </form>
    </body>
</html>
`

func main() {
    z := html.NewTokenizer(strings.NewReader(HTML))
    tt := html.TokenType(7)
    for tt != html.ErrorToken {
        tt = z.Next()
        if tt == html.StartTagToken {
            name, _ := z.TagName()
            fmt.Println(string(name))
        }
    }
}

Answer 1

忽略输入标记并将其解释为表单标记的文本内容

您的前提是错误的，它不会忽略输入标记，如下所示：

package main

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

const HTML = ` 
<!DOCTYPE html>
<html lang="en">
     <head>
        <meta charset="utf-8"/>
        <title>selected attribute</title>
    </head>
    <body>
        <form method="GET">
            <input type="submit" value="submit"/>
        </form>
    </body>
</html>
`

func main() {
    z, _ := html.Parse(strings.NewReader(HTML))
    var f func(*html.Node)
    f = func(n *html.Node) {
        if n.Type == html.ElementNode && n.Data == "input" {
            for _, a := range n.Attr {
                if a.Key == "value" {
                    fmt.Println(a.Val)
                    break
                }
            }
        }
        for c := n.FirstChild; c != nil; c = c.NextSibling {
            f(c)
        }
    }
    f(z)
}

这将打印出“submit”，输入标签的值。

Answer 2

应该使用html.SelfClosingTagToken代替html.StartTagToken来解析input代码。

在Go中解析HTML输入标签

2 个答案: