only in the spring configuration file to add one: to, where location is the location of the configuration file parameters, parameter configuration file is usually placed in the src directory, and the parameters of the configuration file format with java the same general configuration file parameters, namely in the form of key-value pairs, for example: < br />

< pre STYLE = "margin-top: 0px; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; color: rgb (51, 51, 51); font-family: ourier new monospace; font-size: 12px; width: 591px; overflow-x: auto; overflow-y: auto; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: rgb (230, 230, 230); background-position: initial initial; background-repeat: initial initial; "> < br />
: a, in the development stage we connect to the database connection url, username, password, driverClass other

expectations: can not have a solution that can help us in a stage does not require a parameter to write frequently, but in different stages and can easily switch between the parameters of configuration information

2. and these parameters are often required between the different stages of change

value =” $ {test.jdbc.driverClassName }”/>< br />
For example: In the delivery phase of the project development phase and the database connection information is often different, distributed application is the same situation.

period in the development of enterprise applications, or enterprise application deployment to a production environment, the application of information is often dependent on many parameters need to be adjusted, such as an LDAP connection, RDBMS
PropertyPlaceholderConfigurerDemo example by running and analyzing applications, developers are able to in-depth understanding of PropertyPlaceholderConfigurer. To simplify the use of PropertyPlaceholderConfigurer, Spring element provides a The following example shows the configuration, enable it, the developers would not configured PropertyPlaceholderConfigurer the object.
JDBC connection information. externalization of such information management is particularly important. PropertyPlaceholderConfigurer and PropertyOverrideConfigurer object, which is responsible for the external application of the configuration parameters of the task.

external The configuration of application parameters

application: < br />
defined in the configuration file so bean:
class = “org.springframework.jdbc.datasource.DriverManagerDataSource”>
line after the # part of comments

b, distributed applications, client-side access to server-side address used by the server, port, service, etc.

test.jdbc.driverClassName = com.mysql.jdbc.Driver

PropertyPlaceholderConfigurer built-in functions very rich, if it does not find $ {xxx} xxx key defined, it will go to the JVM system property (System.getProperty ()) and environmental variables (System.getenv ()) to find. systemPropertiesMode and searchSystemEnvironment properties by enabling , developers can control this behavior.

} This form of variables used in the spring which provides annotations for annotation properties to provide value
address: spring3 provide an easy way to context: property-placeholder / element

userinfo.properties
following is an excerpt from propertyplaceholderconfigurer.xml . Under normal circumstances, the definition does not appear userInfo $ {db.username}, $ {db.password} and other similar information used here PropertyPlaceholderConfigurer management username and password attributes values. DI container to instantiate userInfo before, PropertyPlaceholderConfigurer will modify the meta data information userInfo ( definition), it will use userinfo.properties scott corresponding value in db.username replace $ {db.username}, db.password corresponding tiger values ??with $ {db.password}. Ultimately, DI container to instantiate userInfo when, UserInfo will get the new property value, rather than $ {db.username}, $ {db.password} and other similar information.

PlaceHolder1.Controls.Add (new
pieces which control the other controls as a collection (collection) contains up you can clear that run-time collection or add
C #]
PlaceHolder1.Controls.Clear ();
[C #]

myButton.InnerText = “Button 4″;
%>
WEbControl wc = new WebControl (HtmlTextWriterTag.Textarea);
private void Page_Load (object sender, System. EventArgs e)
PlaceHolder1.Controls.Add (myButton);
This type of All public static (Visual Basic for
PlaceHolder so you can insert a Textarea
System. Web.UI.Control
Load event: private void Page_Load (object sender,
PlaceHolder1.Controls.Add (LoadControl
control.Text = i.ToString ();
TextBox control = new TextBox ();
myButton.InnerText = “Button 2″;
if (p == null)
System.Web.UI.WebControls.PlaceHolder
PlaceHolder1.Controls.Add (control);
continued to use them, without having to rebuild each page.
load code:
void Page_Load (Object sender, EventArgs e )
Control.Controls collection to add, insert or remove PlaceHolder
through the code, you can project the module folder to see a page that contains a Web User Control (ASCX) The name of the query string parameters
Public Class PlaceHolder
(“modules /” p
runat = “server” />
– such as some “decorative” part: the GIF image header at the horizontal toolbar or navigation bar links on the left, so you can continue

else
Inherits Control
from a Web page to another Web page, your ASP.NET application user interface is often some parts remain the same
“. ascx “));< ??br />
Example
Shared ) members are thread safe. Any instance members are not guaranteed to be thread safe.
For example, you may want to select the user option in the Web

{

sender,
from a Web page to another Web page, your ASP.NET application user interface is often some parts remain the same – such as some “decorative” part: at the GIF image header, horizontal bar or navigation bar links on the left, etc. You can continue to use them, without having to rebuild each page.
In the past, a popular ASP technology is a major part of each page to create an include file, and then build a whole HTML table, table Each unit contains the include files. This approach is feasible, but not pretty, but also error-prone. Fortunately, ASP.NET allows you to use a better way to solve this problem, use a Visual

System.EventArgs e)
AddControlToPlaceHolder ()
Put user code to initialize the page
{
Web User Controls ( ASCX files) to develop all of the pages “content”.

if (! IsPostBack)
PlaceHolder members.

{
2 , a custom user control display

if (p == null)
PlaceHolder1.Controls.Add (wc);
myButton.InnerText = “Button 3″;
Example
i = 0; i <= 5; i )
HTML tables, each table cell contains the include files. This approach is feasible , but not pretty, but also error-prone. Fortunately,
[C ]

HtmlButton myButton = new HtmlButton (); < br /> private void
(“modules /” “Default” “. ascx “));< ??br /> Web controls combined with the use of the Web user controls, for building ASP.NET application to provide a method .
PlaceHolder1.Controls.Add (myButton);
AddControlToPlaceHolder ();
[JScript]
original address: placeholder control Author: tomatoes will PlaceHolder controls dynamically added to the web as a storage server control container. PlaceHolder control does not produce any visible output and can only be used as a container for other controls on the page. You can use
public class PlaceHolder extends Control
/ /
first in VS.NET to create a new ASP.NET Web application. I used the sample code is C #. Creating a Web form, save

thread-safe
PlaceHolder Web
Web applications. I used the sample code is C #. Creating a Web form, save the file with the ASPX extension. I call my main.aspx. This page is only your application Web pages, because you use Web user controls (ASCX files) to develop all of the pages content. ”

Remarks
with the ASPX file extension. I call my main.aspx. This page is only your application Web pages, because you
“. Ascx “));< ??br /> System.EventArgs e)

< % @ Page Language = "C #"
Studio. NET PlaceHolder
PlaceHolder Web control combined with the use of the Web user controls, for building ASP.NET application to provide a method.
add it; For example, you can run to add a Web user control (a modular Web pages). I will talk about how to
myButton.InnerText = "Button 1";

. Then, add the following code to your page in the Page Load event: private void Page_Load (object

("modules /" p ". Ascx "));< br /> controls in the control.
server control allows you to place an empty container control within the page, and then dynamically at run time to add, remove, or loop through child elements. The control only renders its child elements; it does not have its own based on
PlaceHolder1.Controls.Clear ();
myButton = new HtmlButton ();

page variable number of buttons on the display. In this case, the user does not face the choice may lead to confusion, that is, those either not available or has nothing to do with the choice of their own needs.
PlaceHolder1.Controls.Add (LoadControl
control of the control.
where the control is loaded into a PlaceHolder: PlaceHolder1.Controls.Add (myButton);
LiteralControl (”
“));< ??br /> Web Control
(“modules /” “Default”
ASP.NET allows you to use a better way to solve this problem, using a Visual Studio. NET PlaceHolder
else

myButton = new HtmlButton ();
HTML output.
to write one:
System.Object
container for other controls on the page can be stored using
Web page dynamically added server controls on the container.

in MSDN as follows:

PlaceHolder1.Controls.Add (LoadControl
Loaded: http://hi.baidu.com/shijingxin/blog/ item/b45da8345019e7b2d0a2d3dd.html

PlaceHolder
Web control, which controls the other controls as a collection (collection) contains up you can run or add it clear that the collection; For example, you can added at run time a Web user control (a modular Web pages) and I will talk about how to PlaceHolder
for (int
Control.Controls collection to add, insert or remove PlaceHolder

will PlaceHolder control used to store dynamic Web

poly nearer. The following example explains how to control to PlaceHolder .
HTML output, and can only be used for other control symbols a location. In the layout with its efforts, these controls can be added to PlaceHolder of Controls
do not talk nonsense, and look at the following shows:
Controls nearer together. The following example explains how to control to PlaceHolder.
protectedvoidButton1_Click (objectsenderwww.9tistore.info, EventArgse)
output and can only be used for other control symbols a location sibalang.com. In the layout with its efforts, these controls can be added to PlaceHolder for
} values ??should never * be negative .* / public class Example {
bt.ID = “aa”;
PlaceHolder, I do not know how to Zhashui the controls, I find a lot of places, say the increase is the dynamic controls, if really so, then what is the difference and the Panel does?
hb.InnerText = ” HTML button “;
PlaceHolder control can be used as a container control within the document to dynamically load other controls. PlaceHolder control has not been based on HTML
PlaceHolder1.Controls.Add (bt);
PlaceHolder1.Controls.Add (hb);

display: none;
This text is set in the value attribute which, when focused after, test text box value is equal to the default value, if it is empty text box when the text box loses focus, and then check whether the empty, empty, then write the default value. This method is very efficient, and each had to detect the text box.
input [type = "search "]::- webkit-search-decoration,
input.val (input.attr ( laceholder );< br />$( placeholder] . focus (function ()
Now with HTML5, the attribute set by the placeholder setting than the value of more than semantic, however, this property is not all browsers support, so we need the support of jQuery and Modernizr.
}
});< br />$( placeholder] . parents ( form . submit (function ()

remove Webkit search box style
Webkit core browser search box will add some extra style, the CSS can be removed by following this pattern:
$ (this). find ( placeholder] . each (function () < br /> here Modernizr is used to detect whether the browser supports a number of HTML5 attribute if the browser does not support, then run the jQuery code and it will first find all the elements with a PlaceHolder properties, and then stored in a variable and then will be elements of value and this variable contrast, if the placeholder is empty then display the contents inside, and will add a “placeholder” css style.

id =” PlaceHolderPageImage “runat =” server “/>
required to place fill on the left navigation data source container.

the bottom of the Quick Start menu.
id = “PlaceHolderHorizontalNav” runat = “server”>
the Quick Launch bar on the other objects.
the left navigation bar at the top of the region.

id = “PlaceHolderMain” runat = “server”>
id = “PlaceHolderPageTitle” runat = “server” />
not part of the user interface part is for backward compatibility.

bread crumbs bread crumbs on the control text.

runat = “server” />
id = “PlaceHolderPageTitleInTitleArea” runat = “server”
not part of the user interface component for backward compatibility.
id = “PlaceHolderBodyAreaClass” runat = “server” />
id = “PlaceHolderNavSpacer” runat = “server”>
id = “PlaceHolderTitleAreaSeparator”
id = “PlaceHolderSiteName” runat = ” server “>

id =” PlaceHolderTopNavBar “runat =” server “>
id =” PlaceHolderGlobalNavigationSiteMap “
id =” PlaceHolderCalendarNavigator “runat =” server “
does not belong to the user interface component for backward compatibility.
title part of the class (now inside the head tag). If you add a custom of their time to this palceholder WebPartZone will complain.
id = “PlaceHolderBodyLeftBorder” runat = “server”>
id = “PlaceHolderTitleBreadcrumb” runat = “server”>
id = “PlaceHolderTitleAreaClass” runat = “server” />
id = “PlaceHolderQuickLaunchBottom”
id = “PlaceHolderLeftNavBarDataSource” runat = “server”
the top navigation bar navigation menu.
description
fast Launch bar.
not part of the user interface component for backward compatibility.
not part of the user interface component for backward compatibility.
runat = “server”>
id = “PlaceHolderLeftNavBarTop” runat = “server” />
< p ALIGN = "left"> description of the current page.
attached to the bottom of the page content. From the HTML point of view, is the part outside the Form tag.

name of the site where the current page.
PlaceHolder control
appear in the title area the title of the current page.
not part of the user interface component for backward compatibility.

page bread crumbs control.

id = “PlaceHolderSearchArea” runat = “server”>
id = “PlaceHolderLeftNavBarBorder” runat = “server”>

page on the site subsites and brothers global navigation.
runat = “server”>
id = “PlaceHolderQuickLaunchTop” runat = “server”>
page Form Digest control storage container.
is
id = “PlaceHolderMiniConsole” runat = “server” />
id = “PlaceHolderAdditionalPageHead”
Quick Start Menu at the top.
id = “PlaceHolderPageDescription” runat = “server” />
The site title.
id = “PlaceHolderTitleLeftBorder” runat = “server”>
main page content.
not part of the user interface component for backward compatibility.

runat = “server” />
page head part of the placeholder for the HTML page corresponding to the head tag add extras such as ECMAScript (JavaScript, JScript) and Cascading Style Sheets (CSS).
the control class is used to place the page editing controls.

is
id =” PlaceHolderFormDigest “runat =” server “>
ID =” SPNavigation “runat =” server “>

page placement search the control.

id = “PlaceHolderLeftNavBar” runat = “server”>
not part of the user interface component for backward compatibility.
class area in the body.

the top navigation bar to place the container.

not part of the user interface component for backward compatibility.
date picker for the page containing the calendar.
id = “PlaceHolderUtilityContent” runat = “server” />
id = “PlaceHolderTitleRightMargin”
id = “PlaceHolderBodyRightMargin” runat = “server”>