我需要更改框架元素的样式，但iframe没有id或类或名称
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml;
using MySql.Data.MySqlClient;
using System.Windows.Forms.DataVisualization.Charting;
using System.Runtime.InteropServices;
namespace weatherstation1
{
public partial class Form2 : Form
{
string Town;
string Temperature;
string Temperature2;
string Condition;
string Humidity;
string Windspeed;
string ConditionCode;
int cityNumber = 44418;
public Form2()
{
InitializeComponent();
Getweather();
GetCondition();
textBox1.Text = Town;
textBox3.Text = Condition;
textBox4.Text = Humidity;
textBox5.Text = Windspeed;
}
private void toolStripLabel1_Click(object sender, EventArgs e)
{
}
private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
{
AboutBox1 frmAbout = new AboutBox1();
frmAbout.Show();
}
private void Form2_Load(object sender, EventArgs e)
{
}
private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
{
this.Show();
}
private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
{
}
private void aboutToolStripMenuItem1_Click(object sender, EventArgs e)
{
AboutBox1 frmAbout = new AboutBox1();
frmAbout.Show();
}
private void Getweather()
{
string query = String.Format("https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%20in%20(select%20woeid%20from%20geo.places(1)%20where%20woeid%20%3D044418)&format=xml&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys");
XmlDocument wData = new XmlDocument();
wData.Load(query);
XmlNamespaceManager manager = new XmlNamespaceManager(wData.NameTable);
manager.AddNamespace("yweather", "http://xml.weather.yahoo.com/ns/rss/1.0");
XmlNode channel = wData.SelectSingleNode("rss").SelectSingleNode("channel");
XmlNodeList nodes = wData.SelectNodes("/rss/channel/item/yweather:forecast", manager);
Temperature = channel.SelectSingleNode("item").SelectSingleNode("yweather:condition", manager).Attributes["temp"].Value;
Temperature2 = ((Double.Parse(Temperature) - 32) / 1.8).ToString();
Condition = channel.SelectSingleNode("item").SelectSingleNode("yweather:condition", manager).Attributes["text"].Value;
ConditionCode = channel.SelectSingleNode("item").SelectSingleNode("yweather:condition", manager).Attributes["code"].Value;
Time = channel.SelectSingleNode("item").SelectSingleNode("yweather:condition", manager).Attributes["date"].Value;
// Windspeed = channel.SelectSingleNode("yweather:wind", manager).Attributes["speed"].Value;
// Town = channel.SelectSingleNode("yweather:location", manager).Attributes["city"].Value;
}
private void database()
{
// string Time = DateTime.Now.ToString("d/M/yyyy HH:mm");
string MyConnection = "datasource=localhost;database=weatherstation;port=3306;username=weatherstation;password=123456";
MySqlConnection MyConn = new MySqlConnection(MyConnection);
string query1 = "INSERT INTO weatherstation1.London"+
"(City, Time, Temperature, Temperature2, WeatherCondition) VALUES('" + Town +
"','" + Time + "','" + Temperature + "','" + Temperature2 + "' + Condition + "');";
MySqlCommand MyCommand = new MySqlCommand(query1, MyConn);
MySqlDataReader MyReader;
MyConn.Open();
MyReader = MyCommand.ExecuteReader();
}
public void GetCondition()
{
string cc = ConditionCode;
if (cc <= 'Showers')
{
weatherCondition.ImageLocation = "showers.png";
}
else if (cc <= 'Scattered Showers')
{
weatherCondition.ImageLocation = "scatteredshowers.png";
}
else if (cc <= 'Mostly Cloudy')
{
weatherCondition.ImageLocation = "mostlycloudy.png";
}
else if (cc <= 'Rain')
{
weatherCondition.ImageLocation = "rain.png";
}
else if (cc <= 'Mostly Cloudy')
{
weatherCondition.ImageLocation = "mostlycloudy.png";
}
else if (cc <= 'Rain')
{
weatherCondition.ImageLocation = "rain.png";
}
else if (cc >= 'Scattered Thunderstorms')
{
weatherCondition.ImageLocation = "scatteredthunderstorms.png";
}
}
private void button1_Click(object sender, EventArgs e)
{
}
private void button1_Click_1(object sender, EventArgs e)
{
Getweather();
textBox1.Text = Town;
textBox3.Text = Condition;
//textBox4.Text = Humidity;
//textBox5.Text = Windspeed;
}
private void button2_Click(object sender, EventArgs e)
{
database();
}
private void closeToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Close();
}
private void openToolStripMenuItem_Click(object sender, EventArgs e)
{
this.WindowState = FormWindowState.Maximized;
}
private void refreshToolStripMenuItem_Click(object sender, EventArgs e)
{
database();
}
private void tabPage1_Click(object sender, EventArgs e)
{
}
private void graph()
{
if (radioButton2.Checked)
{
MySqlDataReader MyReader2;
string MyConnection = "datasource=localhost;database=weatherstation;port=3306;username=weatherstation;password=123456";
MySqlConnection MyConn2 = new MySqlConnection(MyConnection);
MyConn2.Open();
string query2 = " SELECT * FROM London ";
MySqlCommand MyCommand2 = new MySqlCommand(query2, MyConn2);
MyReader2 = MyCommand2.ExecuteReader();
while (MyReader2.Read())
{
chart1.Series["Series1"].Points.AddXY(MyReader2.GetString("Time"), MyReader2.GetString("Temperature"));
chart1.Series["Series1"].ChartType = SeriesChartType.FastLine;
chart1.Series["Series1"].Color = Color.Blue;
}
}
if (radioButton1.Checked)
{
MySqlDataReader MyReader2;
string MyConnection = "datasource=localhost;database=weatherstation;port=3306;username=weatherstation;password=123456";
MySqlConnection MyConn2 = new MySqlConnection(MyConnection);
MyConn2.Open();
string query2 = " SELECT * FROM London ";
MySqlCommand MyCommand2 = new MySqlCommand(query2, MyConn2);
MyReader2 = MyCommand2.ExecuteReader();
while (MyReader2.Read())
{
chart1.Series["Series1"].Points.AddXY(MyReader2.GetString("Time"), MyReader2.GetString("Temperature2"));
chart1.Series["Series1"].ChartType = SeriesChartType.FastLine;
chart1.Series["Series1"].Color = Color.Blue;
}
}
}
private void button3_Click(object sender, EventArgs e)
{
graph();
Getweather();
database();
}
private void timer1_Tick(object sender, EventArgs e)
{
graph();
Getweather();
database();
}
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
double celc = (Int32.Parse(Temperature) - 32) / (1.8);
string Temperature2 = celc.ToString();
textBox2.Text = Temperature2;
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
textBox2.Text = Temperature;
}
private void textBox7_TextChanged(object sender, EventArgs e)
{
}
private void button4_Click(object sender, EventArgs e)
{
cityNumber = Int32.Parse(textBox7.Text);
timer1.Interval = Int32.Parse(textBox8.Text);
}
private void optionsToolStripMenuItem_Click(object sender, EventArgs e)
{
}
private void tabPage3_Click(object sender, EventArgs e)
{
}
private void toolStripTextBox1_Click(object sender, EventArgs e)
{
Getweather();
toolStripTextBox1.Text = "Temperature:" + Temperature + " F";
}
private void weatherCondition_Click(object sender, EventArgs e)
{
}
}
}
For database in localhost
CREATE TABLE London
(ID INT NOT NULL AUTO_INCREMENT, City VARCHAR(30) NOT NULL, Time VARCHAR(20) NOT NULL, Temperature VARCHAR(5) NOT NULL, Temperature2 VARCHAR(5) NOT NULL, WeatherCondition VARCHAR(30) NOT NULL, PRIMARY KEY (ID));
javascript函数中的错误是什么？
答案 0 :(得分：1)
您好我认为您必须获取节点列表的第一个元素，请参阅http://www.w3schools.com/jsref/met_document_getelementsbytagname.asp
换句话说，你必须这样做：
parent.document.getElementsByTagName("iframe")[0].contentDocument.querySelector(".login").style.display = 'none';
答案 1 :(得分：-1)
为什么不使用jQuery？ - 包括jquery脚本，然后在
之后<script>
$('iframe').hide();
</script>