jQuery Get Complete Guide for Beginners and Experts

jQuery Get Complete Guide for Beginners and Experts
Learn how to use the jQuery .get() method to make AJAX calls.

What you will learn?

I’m going to show how to fetch contents from text files and database by using this method.

The full codes can be downloaded by the link given at the end of this tutorial. Also check the DEMO links for understanding the working of the various codes.

In short: you will master this method.

The jQuery Get function is used to make AJAX calls and can be helpful to update a web page with partial page reloading. It uses HTTP GET method to initiate an AJAX request and fetch data from the external pages.

Let us understand all about this method in details.

Syntax of jQuery Get Method

jQuery.get( url [, data ] [, success ] [, dataType ] )

Parameters:
Name Value
url The URL to where the AJAX request of HTTP GET type is made. It is the Required parameter.
Data Optional parameter – the key-value pairs that will be send with the AJAX request. Eg {sport: “football”,player: “Cristiano Ronaldo”}
success(result,status,xhr) Optional Parameter – the function to call when the AJAX request is successful. All 3 parameters are optional. The result parameter will get the AJAX response.
dataType The Optional Parameter – the type of data returned from the AJAX response. It can be xml, json, script, text, or html

jQuery Get Method to Fetch Contents of a Text File

Let’s fetch a text file’s content with the jQuery Get method:

<button id="loadTextFile">Try</button>
<div id="textData"></div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>
    $(document).ready(function () {
        $.get("file.txt", function (result, status, xhr) {
            $("#textData").html(result);
        });    
    });
</script>

The jQuery .get() method makes the AJAX call to the file.txt and shows it’s contents inside a div called textData.

DEMO

Not just a text file, the above code can be use to fetch contents of other file types, like HTML, JSON, XML, etc.
Capturing jQuery Get Error

Use .fail() to capture any errors that come during the AJAX request.

See the below code:

<button id="loadNoTextFile">Try</button>
<div id="textNoData"></div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>
    $(document).ready(function () {
        $("#loadNoTextFile").click(function (e) {
            $.get("no-file.txt", function (result, status, xhr) {
                $("#textNoData").html(result);
            }).fail(function (xhr, status, error) {
            $("#textNoData").html("Result: " + status + " " + error + " " + xhr.status + " " + xhr.statusText)
        });
    }); 
</script>

In the above code, when trying to access a non-existing file, the .fail() function is called and it shows the message – Result: error Not Found 404 Not Found.

DEMO

jQuery Get method to Fetch Data from Database

With the jQuery Get method you can make AJAX calls to a server page also. This server page in turn fetches data from the Database and returns it back as an AJAX response.

Let us create a small demo application in ASP.NET Web Forms to understand this feature.

jQuery Get Demo Application

There are 2 pages – one is HTML and other is .ASPX. The HTML page has 3 controls – 2 selects and a button.

On clicking the button, the 2 ‘select’ control values are passed to the .ASPX page by the jQuery Get method.

The HTML page code:

<div id="message"></div>
<select id="sportSelect">
    <option value="Select">Select Sports</option>
    <option value="Tennis">Tennis</option>
    <option value="Football">Football</option>
    <option value="Cricket">Cricket</option>
</select>
<select id="playerSelect">
    <option value="Select">Select Sports Person</option>
    <option value="Maria Sharapova">Maria Sharapova</option>
    <option value="Cristiano Ronaldo">Cristiano Ronaldo</option>
    <option value="Sachin Tendulkar">Sachin Tendulkar</option>
</select>

<button id="loadDatabase">Try</button>
<div id="dbData"></div>

The jQuery Code:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>
    $("#loadDatabase").click(function (e) {
        $.get("result.aspx",
            {
                sport: $("#sportSelect").val(),
                player: $("#playerSelect").val()
            },
            function (result, status, xhr) {
                $("#dbData").html(result);
            }).fail(function (xhr, status, error) {
                $("#dbData").html("Result: " + status + " " + error + " " + xhr.status + " " + xhr.statusText)
        });
    });
</script>

In the .ASPX page, I get these 2 select control values, using Request.QueryString method.

I then fetch the respective data from the database.

Once I have the data from the DB then I use the Response.Write method to send it to the jQuery Get method as AJAX response.

The .ASPX page code:

List<MyDataBase> myDataBase;
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        LoadData();
        SearchDatabase();
    }
}

void SearchDatabase()
{
    string sport = Request.QueryString["sport"];
    string player = Request.QueryString["player"];
    try
    {
        string information = myDataBase.FirstOrDefault(x => x.sport == sport & x.player == player).information;
        Response.Write(information);
        Response.End();
    }
    catch (Exception ex)
    {
        Response.Write("NO DATA");
        Response.End();
    }
}

void LoadData()
{
    myDataBase = new List<MyDataBase>();
    myDataBase.Add(new MyDataBase() { sport = "Tennis", player = "Maria Sharapova", information = "Maria Sharapova is a...});
    myDataBase.Add(new MyDataBase() { sport = "Football", player = "Cristiano Ronaldo", information = "Cristiano Ronaldo is a..." });
    myDataBase.Add(new MyDataBase() { sport = "Cricket", player = "Sachin Tendulkar", information = "Sachin Tendulkar is a..." });
}

class MyDataBase
{
    public string sport { get; set; }
    public string player { get; set; }
    public string information { get; set; }
}

Instead of a Database, I have used a list type object which contains some dummy data. The ‘LoadData()’ function adds these dummy data to the list.

Download the source codes and check the demo by using the below 2 links:

DEMO DOWNLOAD

Conclusion

You are now ready to use the .get() method to make any type of AJAX feature in your website. Also check other similar topics in jQuery AJAX:

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ABOUT THE AUTHOR

This article has been written by the Technical Staff of YogiHosting. Check out other articles on "ASP.NET Core, jQuery, EF Core, SEO, jQuery, HTML" and more.