如何在机械化中选择此选择列表的一个选项

Question

所以我有这个代码运行相当不错..最近..我需要选择一个选择列表的选项（只有一个具有GET方法）这里是代码I现在用

require 'mechanize' 
require 'logger' 
agent = Mechanize.new{|a| a.log = Logger.new(STDERR) } 
agent.read_timeout = 60 
def add_cookie(agent, uri, cookie) 
uri = URI.parse(uri) 
Mechanize::Cookie.parse(uri, cookie) do |cookie| 
agent.cookie_jar.add(uri, cookie) 
end 
end 
page = agent.get "http://www.webpage.com" 
form = page.forms.first 
form.correo_ingresar = "user" 
form.password = "password" 
page = agent.submit form 
myarray = page.body.scan(/SetCookie\(\"(.+)\", \"(.+)\"\)/) 
myarray.each{|line| add_cookie agent, 'http://www.sistemasaplicados.com.mx', "#{line[0]}=#{line[1]}"} 

add_cookie(agent, 'http://www.webpage.com.mx', "tampag=1000; path=/; domain=www.webpage.com.mx") 
add_cookie(agent, 'http://www.webpage.com.mx', "codigoseccion_buscar=; path=/; domain=www.webpage.com.mx") 
add_cookie(agent, 'http://www.webpage.com.mx', "codigolinea_buscar=; path=/; domain=www.webpage.com.mx") 
add_cookie(agent, 'http://www.webpage.com.mx', "codigomarca_buscar=; path=/; domain=www.webpage.com.mx") 
add_cookie(agent, 'http://www.webpage.com.mx', "textobuscar=; path=/; domain=www.webpage.com.mx") 
add_cookie(agent, 'http://www.webpage.com.mx', "orden_articulos=existencias asc; path=/; domain=www.sistemasaplicados.com.mx") 

page = agent.get "http://www.webpage.com.mx/tienda/articulos.php" 
busqueda = page.forms.first 
resultado = agent.submit busqued 
tamanio = resultado.form_with(:method => "GET") 
oneselect = resultado.form_with(:name => "tamano") 

，所以我已经习惯变量tamanio表明，选择列表形式：

#<Mechanize::Form 
{name nil} 
{method "GET"} 
{action "http://www.webpage.com.mx/tienda/articulos.php"} 
{fields 
#<Mechanize::Form::SelectList:0x2233350 
@name="tamano", 
@node= 
#(Element:0x11199d8 { 
    name = "select", 
    attributes = [ 
    #(Attr:0x10f30c8 { 
     name = "style", 
     value = "font-family: verdana; font-size: 10px; color:black;" 
     }), 
    #(Attr:0x10f30bc { name = "name", value = "tamano" }), 
    #(Attr:0x10f30b0 { 
     name = "onchange", 
     value = "if (confirm('Haz solicitado modificar la cantidad de articulos por p\u00E1gina. Este cambio permanecer\u00E1 hasta que cierres la sesi\u00F3n o solicites el cambio nuevamente. \u00BFDeseas continuar?')){SetCookie('tampag',this.value); document.location='/tienda/articulos.php';} else {return;} " 
     }), 
     #(Attr:0x10f30a4 { 
     name = "title", 
     value = "Cambiar cantidad de art\u00EDculos por p\u00E1gina" 
     })], 
    children = [ 
    #(Element:0x11197e0 { 
     name = "option", 
     attributes = [ 
     #(Attr:0x10f1a0c { name = "value", value = "10" }), 
     #(Attr:0x10f1a00 { name = "selected", value = "selected" })], 
     children = [ #(Text "10")] 
     }), 
    #(Element:0x1119780 { 
     name = "option", 
     attributes = [ #(Attr:0x10f0a40 { name = "value", value = "20" })], 
     children = [ #(Text "20")] 
     }), 
    #(Element:0x1119720 { 
     name = "option", 
     attributes = [ #(Attr:0x10efed0 { name = "value", value = "30" })], 
     children = [ #(Text "30")] 
     }), 
    #(Element:0x11196c0 { 
     name = "option", 
     attributes = [ #(Attr:0x10ef354 { name = "value", value = "40" })], 
     children = [ #(Text "40")] 
     }), 
    #(Element:0x1119660 { 
     name = "option", 
     attributes = [ #(Attr:0x10ee73c { name = "value", value = "50" })], 
     children = [ #(Text "50")] 
     }), 
    #(Element:0x1119600 { 
     name = "option", 
     attributes = [ #(Attr:0x10eda04 { name = "value", value = "100" })], 
     children = [ #(Text "100")] 
     }), 
    #(Element:0x11195a0 { 
     name = "option", 
     attributes = [ #(Attr:0x10ecec4 { name = "value", value = "500" })], 
     children = [ #(Text "500")] 
     }), 
    #(Element:0x1119540 { 
     name = "option", 
     attributes = [ #(Attr:0x10ec360 { name = "value", value = "1000" })], 
     children = [ #(Text "1000")] 
     })] 
    }), 
@options=[10, 20, 30, 40, 50, 100, 500, 1000], 
@value=[]>} 
{radiobuttons} 
{checkboxes} 
{file_uploads} 
{buttons}> 

貌似选择列表是一个嵌套形式的话，我想：

selectlist.value = selectlist.options.first.value (replacing selectlist with the variable tamanio) 

也尝试添加新节点到现有的选择列表的形式：

oneselect.new("select","1000") 

我失去了一些东西在这里..

Answer 1

我认为你是一般的困惑，一个答案我会只是给你一些注意事项，并希望它能帮助：

• 有没有这样的事情嵌套形式
• 一个的SelectList是不是一个形式，它是一个表单元素，或表单控件

• 您可以通过调用一个方法的形式访问的SelectList，它的 的元素：

  select_list = form.field_with(:name => "tamano") 
  

• 当窗体的方法是GET，它往往容易只是构建 网址，并使用agent.get

  url = "http://www.mysite.com/page?var=#{select_list.value}" 
  agent.get url