如何在运行Firefox浏览器时从C＃应用程序执行JS？ [英] How to execute JS from C# application on running Firefox browser?
问题描述
我正在寻找一些技术来执行javascript以从WinForms C＃应用程序填充已经运行的Firefox中的表单。
I am searching for some technique to execute javascript for filling a form in an already running Firefox from an WinForms C# application.
推荐答案
C＃应用程序HTMLFormData收集将用于填充名为FormToBeFilled的HTML表单内容的数据。对于此示例，我选择收集三条信息（名称，状态和日期）并将它们提供给FormToBeFilled。表单中的Javascript将使用值来初始化三个元素（也包括名称，状态和日期）。
The C# application HTMLFormData collects data that will be used to fill the contents of an HTML Form, named FormToBeFilled. For this example, I choose to collect three pieces of information (name, state, and date) and provide them to FormToBeFilled. Javascript in the form will use the values to initialize three elements (also name, state, and date).
C＃应用程序的表单包含：TextBox name_TB，ComboBox state_CB，DateTimePicker date_DTP，Button revise_data_BUT和Button exit_BUT。有标签标记前三个组件中的每一个。
The C# application's form contains: TextBox name_TB, ComboBox state_CB, DateTimePicker date_DTP, Button revise_data_BUT, and Button exit_BUT. There are labels that label each of the first three components.
假设FormToBeFilled存在于一台服务器。在与FormToBeFilled相同的目录中，还必须存在HTMLFormData的输出，对于此示例，该输出将被称为CToHTML.txt。这是AGREED_FILENAME。 HTMLFormData写入此文件; FormToBeFilled读取此文件。
It is assumed that FormToBeFilled exists on a server. In the same directory as FormToBeFilled must also exist the output of HTMLFormData which, for this example, will be called CToHTML.txt. This is the AGREED_FILENAME. HTMLFormData writes to this file; FormToBeFilled reads from this file.
HTMLFormData没什么特别之处。其来源如下。完整的项目，包括FormToBeFilled，可以在 FillHTMLFromCSharp.zip（9.5 KB）找到。
There is nothing really special about HTMLFormData. Its source follows. The complete project, including FormToBeFilled, can be found at FillHTMLFromCSharp.zip (9.5 KB).
using System;
using System.IO;
using System.Text;
using System.Windows.Forms;
namespace FillHTMLFromCSharp
{
// ******************************************** class HTMLFormData
public partial class HTMLFormData : Form
{
const string AGREED_FILENAME = @"C:\Users\Public\CToHTML.txt";
// ********************************************* OnFormClosing
protected override void OnFormClosing (
FormClosingEventArgs e )
{
base.OnFormClosing(e);
// do wrapup things
}
// ********************************************** HTMLFormData
public HTMLFormData ( )
{
InitializeComponent ( );
}
// ****************************************** revise_data_file
void revise_data_file ( )
{
string date = date_DTP.Text;
string message = String.Empty;
string name = name_TB.Text;
object provided_state = state_CB.SelectedItem;
string state = String.Empty;
if ( String.IsNullOrEmpty ( name ) )
{
message = "A name must be provided";
}
if ( provided_state == null )
{
if ( !String.IsNullOrEmpty ( message ) )
{
message += Environment.NewLine;
}
message += "A state must be provided";
}
else
{
state = provided_state.ToString ( );
}
if ( String.IsNullOrEmpty ( message ) )
{
using ( StreamWriter sw = new StreamWriter (
AGREED_FILENAME,
false ) )
{
StringBuilder sb = new StringBuilder ( );
sb.AppendFormat ( "{0},{1},{2}",
name,
date,
state );
sw.Write ( sb.ToString ( ));
}
}
else
{
MessageBox.Show ( message,
"Input Error" );
}
}
// ************************************************* BUT_Click
void BUT_Click ( object sender, EventArgs e )
{
Button button = ( Button ) sender;
string tag = button.Tag.ToString ( ).
ToLower ( ).
Trim ( );
switch ( tag )
{
case "exit":
Application.Exit ( );
break;
case "revise_data":
revise_data_file ( );
break;
default:
throw new ApplicationException (
"Unrecognized button pressed" );
}
}
} // class HTMLFormData
} // namespace FillHTMLFromCSharp
两件感兴趣的话：
Two items of interest:
- CToHTML.txt文件位于C：\ Users \ Public \目录中。这使得程序可以在任何地方由任何人运行而不会出现安全问题。在HTMLFormData完成其执行后，必须将CToHTML.txt文件复制到找到FormToBeFilled的目录中。部署时，应修改常量AGREED_FILENAME以指向同一目录，从而不必复制副本。
- 写入CToHTML.txt文件时，请勿使用StreamWriter WriteLine放置< cr>< lf>在行尾。这将导致解析数据的Javascript中出现问题。而是使用StreamWriter写。
为方便起见，我在FormToBeFilled中包含了Javascript 。 Javascript在窗口加载时执行。 FormToBeFilled显示为：
For expediency, I included the Javascript within FormToBeFilled. The Javascript executes on window load. FormToBeFilled appears as:
<!DOCTYPE HTML PUBLIC
"-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
<form action="">
<table cellpadding="10" cellspacing="0">
<tr>
<td align="right">
Name
</td>
<td align="left">
<input id="name"
type="text"
style="width: 200px;"
maxlength="100"
title="Enter your name"
value="foo" />
</td>
</tr>
<tr>
<td align="right">
State
</td>
<td align="left">
<select id="states">
<option value="AL">AL</option>
<option value="AK">AK</option>
<option value="AZ">AZ</option>
<option value="AR">AR</option>
<option value="CA">CA</option>
<option value="CO">CO</option>
<option value="CT">CT</option>
<option value="DC">DC</option>
<option value="DE">DE</option>
<option value="FL">FL</option>
<option value="GA">GA</option>
<option value="HI">HI</option>
<option value="ID">ID</option>
<option value="IL">IL</option>
<option value="IN">IN</option>
<option value="IA">IA</option>
<option value="KS">KS</option>
<option value="KY">KY</option>
<option value="LA">LA</option>
<option value="ME">ME</option>
<option value="MD">MD</option>
<option value="MA">MA</option>
<option value="MI">MI</option>
<option value="MN">MN</option>
<option value="MS">MS</option>
<option value="MO">MO</option>
<option value="MT">MT</option>
<option value="NE">NE</option>
<option value="NV">NV</option>
<option value="NH">NH</option>
<option value="NJ">NJ</option>
<option value="NM">NM</option>
<option value="NY">NY</option>
<option value="NC">NC</option>
<option value="ND">ND</option>
<option value="OH">OH</option>
<option value="OK">OK</option>
<option value="OR">OR</option>
<option value="PA">PA</option>
<option value="RI">RI</option>
<option value="SC">SC</option>
<option value="SD">SD</option>
<option value="TN">TN</option>
<option value="TX">TX</option>
<option value="UT">UT</option>
<option value="VT">VT</option>
<option value="VA">VA</option>
<option value="WA">WA</option>
<option value="WV">WV</option>
<option value="WI">WI</option>
<option value="WY">WY</option>
</select>
</td>
</tr>
<tr>
<td align="right">
Date
</td>
<td align="left">
<input id="date"
type="text"
style="width: 200px;"
maxlength="100"
title="Enter the date"
value="bar" />
</td>
</tr>
</table>
</form>
<script type="text/javascript">
window.onload = init;
function init ( )
{
if ( window.XMLHttpRequest )// IE7+, Firefox, Chrome, Opera, Safari
{
xmlhttp=new XMLHttpRequest ( );
}
else // IE6, IE5
{
xmlhttp=new ActiveXObject ( "Microsoft.XMLHTTP" );
}
xmlhttp.open ( "GET", "CToHTML.txt", false );
xmlhttp.send ( null );
response = xmlhttp.responseText;
// name,date,state
var items = response.split ( "," );
document.getElementById ( "name" ).value = items [ 0 ];
document.getElementById ( "date" ).value = items [ 1 ];
var state = items [ 2 ];
var states = document.getElementById ( "states" );
var options = states.options;
for ( var i = 0; ( i < options.length ); i++ )
{
if ( options.item ( i ).innerHTML == state )
{
states.selectedIndex = i;
break;
}
}
}
</script>
</body>
</html>
Hope that helps.
Hope that helps.
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