This jQuery code snippet is used to get dynamic variables stored as parameters in the URL and store them as JavaScript variables for use with your script. Different from hash URLs, because the world is moving to dynamic web applications. Therefore, operations such as decoding URL strings will be popular in the next few years.

$.urlParam = function(name){
    var results = new RegExp('[\?&]' + name + '=([^]*)').exec(window.location.href);
    return results[1] || 0;
}

// example.com?param1=name&param2=&id=6
$.urlParam('param1'); // name
$.urlParam('id');        // 6
$.urlParam('param2');   // null

// 帶空格的參數(shù)示例
http://www.jquery4u.com?city=Gold Coast
console.log($.urlParam('city'));  
//輸出：Gold%20Coast

console.log(decodeURIComponent($.urlParam('city')));  
//輸出：Gold Coast

This can be used to set the default value of the text input field, for example:

$('#city').val(decodeURIComponent($.urlParam('city')));

Thanks to bjverde for improving this function:

$.urlParam = function(name){
    var results = new RegExp('[\?&]' + name + '=([^]*)').exec(window.location.href);
    if (results==null){
       return null;
    }
    else{
       return results[1] || 0;
    }
}

FAQs for URL parameters in jQuery (FAQs)

How to use jQuery to get URL parameters?

To use jQuery to get URL parameters, you can use the window.location.search attribute. This property returns the query string parameter of the URL. You can then use the substring() method to delete the question mark at the beginning of the query string. After that, you can split the parameters by the & character. Here is a simple example:

var params = window.location.search.substring(1).split('&');

Now, each element in the params array represents a URL parameter. You can further split each parameter by equal sign to separate the parameter name and value.

How to use jQuery.param() method?

jQuery.param() method is a utility function that creates a serialized representation of an array or object. This is useful when you want to create a query string from an array or object. Here is an example:

var params = { name: 'John', age: 30 };
var queryString = $.param(params);

In this example, queryString will be the string "name=John&age=30".

Can I get URL parameters without jQuery?

Yes, you can use pure JavaScript to get URL parameters without using jQuery. The window.location object in JavaScript provides properties and methods that can be used to handle the current URL. For example, you can use the window.location.search property to get the query string parameters.

How to set URL parameters using jQuery?

jQuery does not provide a built-in method to set URL parameters. However, you can use the window.location object in JavaScript to change the URL. If you want to change the URL without reloading the page, you can use the history.pushState() method.

How to use jQuery to delete specific URL parameters?

To delete a specific URL parameter, you can first use the window.location.search attribute to get all parameters. You can then create a new query string that does not contain the parameters you want to delete. After that, you can set a new query string using the history.pushState() method.

How to use jQuery to check if URL parameters exist?

You can check if the URL parameter exists by using the window.location.search attribute to get all parameters. You can then split the parameters and check if the parameters you are looking for are in the array.

Can I use jQuery to handle hash parameters in the URL?

Yes, you can use the window.location.hash attribute to handle hash parameters in the URL. This property returns the part after the hash symbol in the URL.

How to use jQuery to get multiple URL parameters?

To get multiple URL parameters, you can use the window.location.search attribute and split the parameters by the & character. Each element in the result array represents a URL parameter.

Can I change the URL using jQuery without reloading the page?

Yes, you can change the URL without reloading the page using the history.pushState() method in JavaScript. This method adds a new entry to the browser's history.

How to handle URL parameters in AJAX request using jQuery?

When using jQuery for AJAX request, you can include URL parameters in the URL string. Alternatively, you can use the $.ajax() option in the data method to include parameters. This option automatically converts an object or array to a query string.

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