Home > Developer > ASP

ASP. NET Treeview check box to select all or all

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞
ASP. NET Treeview check box to select all or all
(1) The Treeview control does not disclose the autopostback attribute. Therefore, to submit the check box selection, you must place a control (such as the button Web Server Control) on the page to send the information back to the server.
(2) Another method is to write JavaScript scripts on the client.
But there is a problem: Treeview is dynamically generated. When will all selected scripts be called? The answer must be to call the fully-selected Javascript script function on the onclick event on the checkbox of the root node. Then the HTML in the automatically generated page Code There is no onclick event. What should I do? The problem has been transferred. What should I do? Add one by yourself. How can I add one? When can I add one? When to add, of course, when the page is loaded (in the page_load event), that's a problem. How to add it?
The Code is as follows (add an onclick event to the root node ):
String STR = "<SCRIPT type = 'text/JavaScript 'Language = 'javascript'>
Document. getelementbyidx_x ('treeview1n0checkbox'). setattribute ('onclick', 'rec
() '); </SCRIPT> ";
Clientscriptmanager cs = page. clientscript;
CS. registerstartupscript (this. GetType (), "addonclick", STR );
Next, we will find that there is no error at all, but it cannot achieve the effect. The reason is very simple. There is no implementation of the "Rec ()" method.
The method code is as follows:
<SCRIPT type = "text/JavaScript" Language = "JavaScript">
Function Rec (){

var OBJ = Document. getelementbyidx_x ('treeview1n0checkbox '); // obtain the root node element
for (VAR I = 0; I If (document. getelementsbytagname_r ("input "). item (I ). type = "checkbox") {
document. getelementsbytagname_r ("input "). item (I ). checked = obj. checked;
}}

      
    
       }
 </SCRIPT>
In this way, the code needs to be further optimized to achieve a more powerful effect. This is not the case.
It's hard to understand, but I have been thinking about it for two days.
(3) jquery can be used for implementation at the end, which is simpler and more powerful (all or none of the first-level nodes can be selected )!
Therefore, this method is recommended.
The Code is as follows:
<% @ Page Language = "C #" codebehind = "Treeview. aspx. cs" inherits = "Treeview. Treeview" %>

<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> </title>
 <SCRIPT src = "scripts/jquery-1.4.1-vsdoc.js" type = "text/JavaScript"> </SCRIPT>
   <Script language = "JavaScript" type = "text/JavaScript">
       $ (Document). Ready (function (){
           // To avoid confusion with other elements on the page, place the Treeview control in a div with the ID of Treeview, and then
           // Search for the checkbox
           $ ("# Treeview table tr TDInput [type = checkbox] "). Click (
            Function (){

                $ ("# Treeview Div [ID =" + $ (this ). ATTR ("ID "). tostring (). replace (/checkbox/, "nodes") + "] Table tr TDInput [type = checkbox] ")
                   . ATTR ("checked", $ (this). ATTR ("checked "));
                        }
           );
            });
   </SCRIPT>
</Head>

<Body>
<Form ID = "form1" runat = "server">
<Div id = "Treeview">
<Asp: Treeview id = "treeview1" runat = "server" showcheckboxes = "all">
<Nodes>
<Asp: treenode text = "" value = "">
<Asp: treenode text = "Business College" value = "Business College"> </ASP: treenode>
<Asp: treenode text = "" value = ""> </ASP: treenode>
</ASP: treenode>
<Asp: treenode text = "city" value = "city">
<Asp: treenode text = "Jinan City" value = "Jinan City">

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
asp or asp net catchall or catch all or in asp net how to check all users in linux mongodb select all mysql select all databases mysql select all users
Related Article
Formatremoteurl function of the ASP implementation format int...
ASP. NET core combined with consul cluster &docker to rea...
ASP. NET Core SignalR uses a generic hub to gracefully invoke...
ASP. NET Core 2.0 leverages Masstransit integrated RABBITMQ
Integration testing of ASP. NET Core Webapi using Xunit
CKEDITOR + CKFINDER image upload configuration (C #/asp.net/php)

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More