Home > Developer > JavaScript

JavaScript controls whether a new window opens for a site link

Source: Internet
Author: User
Tags setcookie
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

However, in the verification standard of the target=, the "_blank" attribute is not validated.

The reason is that those who think of the brick to open a new window without the consent of the user, such behavior belongs to strong X user's thought. Is unfriendly, impolite behavior. So the standard proposed is to use rel= "external" to declare, with a external.js to achieve. Here to paste this JS file code, need friends to take away.

The code is as follows Copy Code

function Externallinks () {
if (!document.getelementsbytagname) return;
var anchors = document.getElementsByTagName ("a");
for (var i=0; i<anchors.length; i++) {
var anchor = Anchors[i];
if (Anchor.getattribute ("href") &&
Anchor.getattribute ("rel") = = "External nofollow")
Anchor.target = "_blank";
}
}
Window.onload = Externallinks;

But the above is not the main content of this article, here I mainly introduce a new method:

Through JS to enable users to choose whether to open the link in a new window: This code can record cookies, save 365 days. That is, the user chooses to save this setting for a certain amount of time without deleting the cookie.

Here's a demo of the Code: (It's recommended to save as an HTML file to make it easier to see cookies)

The code is as follows Copy Code

<script type= "Text/javascript" >
Window.onload=checkcookie;
function GetCookie (c_name)
{
if (document.cookie.length>0)
{
C_start=document.cookie.indexof (c_name + "=")
if (c_start!=-1)
{
C_start=c_start + c_name.length+1
C_end=document.cookie.indexof (";", C_start)
if (c_end==-1) c_end=document.cookie.length
Return unescape (document.cookie.substring (c_start,c_end))
}
}
Return ""
}

function Setcookie (c_name,value,expiredays)
{
var exdate=new Date ()
Exdate.setdate (Exdate.getdate () +expiredays)
document.cookie=c_name+ "=" +escape (value) +
((expiredays==null)? "" : "; Expires= "+exdate.togmtstring ())
}

function Checkcookie ()
{
Target=getcookie (' target ')
if (Target!=null && target== "true")
{
document.getElementById ("Checkit"). Checked=true;
Openstyle ("_blank");
}
Else
{
if (Target!=null && target== "false")
{document.getElementById ("Checkit"). Checked=false;
Openstyle ("");}
}
}

function Openstyle (choice) {
var links = document.getElementsByTagName ("a");
for (Var i=0;i<links.length;i++) {
Links[i].target = choice;
}
}
function SetCheck (obj) {
if (obj.checked)
{
Openstyle ("_blank");
Setcookie (' target ', ' true ', 365);
}
else{
Openstyle ("");
Setcookie (' target ', ' false ', 365);
}
}
</script>
<body>

<input type= "checkbox" id= "Checkit" onclick= "SetCheck (this);"/> Choose whether to open <br/> in a new window
<a href= "Http://www.111cn.net" >baidu</a><br/>
<a href= "Http://www.111cn.net" > Android Theme </a>
</body>


Advanced section: Free to set up the station inside the station outside the link whether a new window open if some friends need to set up the link in the station in this window open, the links outside the station are all new windows, how to do?

First Add code:

The code is as follows Copy Code

var index=location.hostname; Get the current primary domain

Then modify the Openstyle function to:

The code is as follows Copy Code
function Openstyle (choice) {
var links = document.getElementsByTagName ("a");
for (Var i=0;i<links.length;i++) {
if (Links[i].href.indexof (index) ==-1 && links[i].href.indexof (' javascript ') = = 1) {
Links[i].target = choice;
}
}
}

OK, this is the end. This will be able to determine the site link in the current window open, outbound links in the new window opened.

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:
a certification for dummies a for dummies preparing for comptia a exam starting salary for a certification a a safety best book to study for a certification drive a
Related Article
Ajax and 302 response code test_javascript-js tutorial

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