CODEWITHSUNDEEP
javascriptjqueryhtmlanchor
Stephen
Stephen

Reputation: 3982

How to add/update params to href attribute via jQuery?

I have a page which has an anchor element:

<a id="courses" href="/courses">Courses</a>

And I want to add or update some params to the href, for example:

What's the best way to do it via JavaScript or jQuery?

Upvotes: 2

Views: 2089

Answers (4)

Mamun
Mamun

Reputation: 68933

You can pass a function as the second parameter to the .attr() to modify the href attribute.

Try the following way:

// set
$("#courses").attr('href','/courses?country=US'); 
console.log($("#courses").attr('href'));

// update
$('#setParam').click(function(){
  $("#courses").attr('href', function(_, el){
    return el.replace(/(country=)[a-z]+/ig, '$1UK');
  });
  console.log($("#courses").attr('href'));
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a id="courses" href="/courses">Courses</a>
<button id="setParam" type="button">Set Param</button>

Upvotes: 2

AnonymousSB
AnonymousSB

Reputation: 3604

Here's an example in both JavaScript, and jQuery.

Vanilla JavaScript

function updateCountry (element, country) {
  var url = element.getAttribute('href');

  if (url.includes('country')) {
    url = url.replace(/(\?country=)[A-Z]{2}/, `$1${country}`)
  } else {
    url = url.concat(`?country=${country}`)
  };

  element.setAttribute('href', url);

  console.log(element.getAttribute('href'));
}

var element = document.getElementById('courses');

updateCountry(element, 'US'); // Add
updateCountry(element, 'UK'); // Update
<a id="courses" href="/courses">Courses</a>

jQuery

function updateCountry (element, country) {
  var url = element.attr('href');
  
  if (url.includes('country')) {
    url = url.replace(/(\?country=)[A-Z]{2}/, `$1${country}`)
  } else {
    url = url.concat(`?country=${country}`)
  };

  element.attr('href', url);

  console.log(element.attr('href'));
}

var element = $('#courses');

updateCountry(element, 'US'); // Add
updateCountry(element, 'UK'); // Update
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a id="courses" href="/courses">Courses</a>

Upvotes: 0

mike510a
mike510a

Reputation: 2168

Wrrite a custom function to handle adding properties to the href attribute.

// function to change href attribute

function addPropertyToCourses(prop,value) { 

   var courses = document.getElementById('courses');
   if (courses.href.indexOf("?") == -1) { 
      courses.href += "?"; 
   } else {
      courses.href += "&";
   }
   courses.href += prop + '=' + value;
}

(function() { 
 // add properties
    addPropertyToCourses("country", "UK");
    addPropertyToCourses("someProp", "someValue");
})();
<a id="courses" href="/courses">Courses</a>

Upvotes: 1

Mohammad
Mohammad

Reputation: 21499

Use jquery .attr( function ) to add/edit href attribute of element. In function check if attribute hasn't country parameter, add to it and if has edit it.

$("#courses").attr("href", function(i, href){
  var index = href.indexOf("?");
  return (index == -1 ? href : href.substring(0, index)) + "?country=US";
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a id="courses" href="/courses">Courses</a>

Upvotes: 0

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