How Can I Update Query String Parameters Using JavaScript?

Updating Query String Parameters with JavaScript

Adding or updating query string parameters in a URL can be a common task in web development. This can come in handy when you need to add or modify specific information in the URL, particularly in client-side development. Here's a concise guide on how to achieve this using JavaScript, specifically with jQuery:

To achieve this functionality, a custom function can be created like the following:

function updateQueryStringParameter(uri, key, value) {
  var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
  var separator = uri.indexOf('?') !== -1 ? "&" : "?";
  if (uri.match(re)) {
    return uri.replace(re, '' + key + "=" + value + '');
  }
  else {
    return uri + separator + key + "=" + value;
  }
}

This function takes the following parameters:

• uri: The original URL
• key: The query string parameter name
• value: The new value for the parameter

The function begins by creating a regular expression to match the existing query string parameter, if present. It then checks if the parameter already exists in the URL using the match() method.

If the parameter is found, the replace() method is used to replace the existing value with the new value. If the parameter is not found, the function concatenates the separator and the new parameter to the end of the URL.

This custom function offers a convenient way to dynamically update query string parameters, whether they exist or not, making it a useful tool for various web development scenarios.

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