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drop-down boxThe basic operation of the JQ for a drop-down box isSelect Change Event$ ("#selectID"). Change (function () {selectchangefuncode; });Get property valueGets the Text property value of the drop-down box check itemvar SelectText = $ ("#selectID"). Find ("option:selected"). Text ();Console.log (SelectText);//Gets the value of the drop-down box for the selected item ①var Selectvalue = $ ("#selectID"). Val ();Console.log (Selectvalue);Gets the value of the Index property of the drop-down

Avoid null useMost languages have a special keyword or object that represents an object that refers to a "none", in Java, which is null. In Java, null is a keyword, not an object, so it is illegal to call any method on it. But this is a confusing choice for language designers. Why do you want to return a keyword when the programmer wants to return an object?The option type of ScalaIn order for everything to be more consistent with the object's goal, a

The use of Eclipse-------Text File encoding does not have the GBK option set 2013-12-25 09:48:06 tag: Java myeclipse useOne project was encoded using GBK, and after importing to Myeclipse10, my entire eclipse environment was UTF-8 encoded, which resulted in Chinese garbled characters.Workaround:This option is not GBK in the right-click Project->properties->text File encoding. At this point you can manually

Users have been accustomed to directly click on the Task column in the display of the desktop button, all the Windows to minimize processing, directly back to the computer desktop, the operator sometimes open many windows, this time if a minimized window will be very troublesome, but some users of the assembly Win7 system found returned to the desktop icon suddenly disappeared, At this time can only be pressed on the keyboard of the win and D keys, can be the bottom of the window, then Win7 can

Everyone first contact computer should be online to check some information, contact the first software should be IE browser, also know IE browser Internet options are very important, it is a lot of important attributes to set up, such as: Shielding the annoying pop-up ads on the Web page, turn off the pop-up prompts, Clear the Automatically saved login password, restore IE for the default browser, such as a series of settings. But recently a user reflects a notebook win7 system Internet

When using the wireless settings under Windows 8 system, the option is grayed out, making the wireless setting system unable to open, not using, how to deal with it? Now let's have a look! Failure phenomenon: IdeaPad Series Notebook Win8 The wireless setting option is grayed out and cannot be adjusted, causing wireless to not open. Solution: Take Y400 as an example: Uninstall a key ghost XP SP3 P

win8.1 Click Microsoft Pinyin Shortcut Input option prompts Windows to find no file resolution. There is user feedback in the Win8.1 Control Panel to find "Input Method", and then click "Microsoft Pinyin Simple input option" unexpectedly pop-up error prompts: Windows can not find the file, why is this happening? In response to this problem, small series and everyone to share detailed reasons and solutions.

What about the Win8 system right-click menu without the "Burn disc image" option? 1, select the Mirror file, right click on the open mode, select "Select the default program"; 2, then select more options under "How do you want to open this file"? 3, choose "On this computer to find other applications"; 4, in open Mode window, in the C disk (default) c:windows directory to find Explorer.exe, select Open; 5, then we r

There are no events (such as Click,mouseover) in the 1,IE6/7/8/9, and Firefox/safari/chrome/opera. Copy Code code as follows: Example: 12 2, click Option to get the event source target via srcelement select,firefox/safari/chrome/opera is option in IE. Copy Code code as follows: Example: 1 3,ie6 Add title attribute to

Boot option launch CSM is gray can not be modified, is currently disabled state, how can I modify this item? PS: Pre-installed WIN8 win7 system, boot without CD-ROM to start this item Do the following to change the BIOS settings: On the boot of the long press F2 key into the BIOS interface, through the direction of the "secure" menu, through the key to select the "Secure Boot Control" option, set it as "Di

Recently in research Webpack, when I execute a command such as NPM run BUILD/NPM start/npm run server, I am prompted with the following warning message WARNING in ConfigurationThe ' mode ' option has a not been set. Set ' mode ' option to ' development ' or ' production ' to the Enable defaults for this environment. The general meaning is: "mode" is not set, please specify whether "development

The example of this article describes the solution of IE in which the mouse option triggers the mouseout. Share to everyone for your reference. The specific analysis is as follows: Features to implement: There is a div, when the mouse passes when this div is fully expanded, when the mouse moved away div shrink back, where the div inside a select box; When you manipulate select, a problem occurs in IE, and when the mouse is

WinRAR is a lot of users often use a decompression software, which has a very powerful function. A WIN10 system users feedback their own computer Right-click menu has multiple WinRAR options, look very uncomfortable, this how to solve? The following small series is going to introduce you to the WIN10 system right-click the menu of multiple winrar options to synthesize an option method. Let's go and have a look! The steps are as follows: 1, click th

access| Control Novice: How do you determine the current activation page in an option page control in a form in access? Topic Address: http://access911.net/index.asp?board=4recordid=71FAB31E10DCE7F3 Brief description: How do you determine the current activation page in an option page control in a form in access? Problem: I added a tab tool to the form (Access) with two pages. T_tabledescription

Win7 system is powerful, in order to better operate the computer in daily life, users will choose to use the desktop shortcut icon to the folder or program quick access, the practice is to use some more commonly used folders or programs to create shortcuts sent to the desktop. In addition, in fact, we can also add the "Download" option in the Start menu, by adding the download option, users can more quickly

Label:1. Error when backing up MySQL database, export data: [[email protected] ~]# mysqldump-uroot-p mysql >/root/bck.sql Enter Password: mysqldump:couldn ' 'SET option sql_quote_show_create=1'option Sql_quote_show_ create=1' at line 1 (1064) 2, query whether mysqldump version issue: [Email protected] ~]# mysqldump--version mysqldump 10.135.1. redhat-linux-GNU (x86_64) ~ ]# which mysqldump/usr/bin/mysq

Applies To: Enterprise Edition database-version 12.1.0.1 (12.1) The knowledge in this document applies to all platforms. Document purpose documents describe many aspects and usages of a pluggable database to better understand the product, and the document can also be used as a quick reference manual. Q-cdb/pdb conceptual knowledge in the 12c multi-tenancy architecture. What does pluggable database (PDB) mean in a multitenant architecture? The pluggable database (PDB) is a new feature in Oracle D

Result_cache (MODE DEFAULT) ora-00922:missing or invalid option is encountered when building tables in Oracle 11.2 databaseHostdr:[/home/oracle] $sqlplus/as sysdbasql*plus:release 11.2.0.3.0 Production on Thu Jul 9 12:52:11 2015Copyright (c) 1 982, Oracle. All rights reserved. Connected to:oracle Database 11g Enterprise Edition Release 11.2.0.3.0-64bit productionwith The partitioning, OLAP, Data Mining and Real Application testing optionssql>sql> CR

Tags: blog http os io using AR file Data 2014To say the slave_skip_errors option, you have to mention the MySQL replication mechanism, in general it divided three steps to achieve MySQL master and slave library synchronization Master changes the record to binary log (these are called binary log events, binary logs event); The slave copies the binary log events of master to its trunk log (relay log); Slave redo the events in the trunk

Tags: func CTI proxy ring execution failover load sed autoAfter we have installed the database, we need to check the database components once to see if the status is available. When manually building the library, there are components that are not fully installed and require us to manually install the required components. Here is a way to view the components.--View the components in the system sql> select comp_id,comp_name,status,con_id from Cdb_registry; comp_id comp_name STATUS con_id----------