javascript - How to add an attribute on load time using jquery

i have a html page in which i have a number of anchor tags i want to add rel="no follow" attribute in anchor tag if it doesn't have it on the pages whose source is starting with hyper text transfer protocol request. some of the anchor have already rel attribute. how can i achieve it through

example:-

<html>
    <body>
        <p> Here we go</p>
        <a href=""> a1</a>
        <a href="" rel="nofollow" > a2</a>
        <a href="">a3</a>
    </body>
</html>

i want to add rel= no follow attribute on a1 and a2 on page load time how can i achieve this

example:-

<html>
    <body>
        <p> Here we go</p>
        <a href="https://www.abc."> a1</a>
        <a href="https://www.abc." rel="nofollow" > a2</a>
        <a href="https://www.abc.">a3</a>
    </body>
</html>

i want to add rel= no follow attribute on a1 and a2 on page load time how can i achieve this

Share Improve this question edited Oct 17, 2013 at 7:18 asked Oct 17, 2013 at 6:31 user2142786 1,48210 gold badges43 silver badges79 bronze badges

rel="nofollow" you are missing quotes . – Tushar Gupta - curioustushar Commented Oct 17, 2013 at 6:32
Should the src actually be an href? – Brian Wigginton Commented Oct 17, 2013 at 6:42

Add a ment |

5 Answers 5

Sorted by: Reset to default 3

$('a').each(function(){
    if(this.innerHTML == 'a1' || this.innerHTML == 'a2'){
        $(this).attr('rel','nofollow');
    }
});

updated after op's cpmment

DEMO

$('a[href^="http"]').attr('rel', 'nofollow'); // all links starting with http wil get rel attribute

^ attribute starts with selector

Change you HTML

<a src="https://www.abc."> a1</a>

<a href="https://www.abc."> a1</a>

it's not src it's href

tri this:

var A=document.getElementsByTagName("a");
for(var i=0;i< A.length;i++)
{
    if(A[i]['rel']!="")
    {
        A[i].setAttribute("rel","Something");
    }
}

$("a:contains('a1'),a:contains('a2')").attr("rel","no follow");

reference contains-selector

updated

if($("a").attr("rel")=="no follow")
 {
// do stuff
  } else{// if not exist
  //do your stuff
  }

$(function () {// on page load time
  $('a').each(function () {// check every a element
    var text = $(this).html();// get the content
    if (text.indexOf('a1') > 0 || text.indexOf('a2') > 0) {// find a1 and a2
      $(this).attr('rel', 'no follow');// set the rel to no follow
    }
  );
});

Updated Code

$('a:not([rel])[href^="http"]').attr('rel','nofollow')

Tushar Gupta provided a one liner that would find all http links and add rel attributes, however it didn't account for links that already had rel attributes.

Original Solution

// find all links that do not have a rel attribute
$('a:not([rel])').each(function() {

    var $this = $(this),
        href = $this.attr('href');

    // check that the link starts with http[s]://
    if(href && href.match(/https?:\/\//)) {
        $this.attr('rel', 'nofollow');
    }
});

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5 Answers 5

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