Learning how to access JavaScript variables within a Ruby on Rails view

Question

Learning how to access JavaScript variables within a Ruby on Rails view

Our team has been working on a javascript code that captures the URL of a selected image and stores it in a JavaScript variable called "src". The goal is to access this variable within a Rails view in order to obtain the ID of the selected image. We attempted to achieve this using Ajax, passing the URL to a variable created in the controller. However, we encountered issues with the Ajax call not functioning as expected, resulting in the controller variable always displaying a nil value. We explored two different methods for implementing Ajax:

Method 1:

$('#submit').click(function(){
$.ajax({

    type: "POST",

    url: "index",

    cache: false,

    data: "src="+src1,

    success: function(){ 

           alert("DATA SAVED");

     }
});

Method 2:

<%= link_to_remote "submit" , :url=>{:controller=>'album',:action =>'index' ,:var=>'src1'}%>

javascript ruby-on-rails ajax

Answer 1

Answer №1

If you're looking to enhance your Ajax functionality, consider making some adjustments in the following way.

var MyData = '';
function fetchData() {
    return $.ajax({
        url: 'index',
        type: 'POST',
        // Remember to use params[:src] in your controller method to access src1
        data: { src: src1 },
        // Ensure that your response is returned in JSON format
        success: function(data){ MyData = data }
    });
}

Now, the response from your POST request will be stored in the MyData variable.
Here's an example of how to send a JSON response from a controller method:

def index
    // Utilize the data you received from the Ajax call
    data = params[:src]
    // Process the information
    result = something
    // Send back the response in JSON format
    render :json => result
end

Below is a demonstration of how to implement the fetchData() function on a submit event:

$('#submit').click(function(){
    fetchData().done(function() {
        // Your MyData variable will now contain the details from your POST request.
        // You can check it by logging it in the console
        console.log(MyData)
      }).fail(function(){
          alert('The Ajax call has failed')
    });
});

Answer 2

If you're looking to enhance your Ajax functionality, consider making some adjustments in the following way.

var MyData = '';
function fetchData() {
    return $.ajax({
        url: 'index',
        type: 'POST',
        // Remember to use params[:src] in your controller method to access src1
        data: { src: src1 },
        // Ensure that your response is returned in JSON format
        success: function(data){ MyData = data }
    });
}

Now, the response from your POST request will be stored in the MyData variable.
Here's an example of how to send a JSON response from a controller method:

def index
    // Utilize the data you received from the Ajax call
    data = params[:src]
    // Process the information
    result = something
    // Send back the response in JSON format
    render :json => result
end

Below is a demonstration of how to implement the fetchData() function on a submit event:

$('#submit').click(function(){
    fetchData().done(function() {
        // Your MyData variable will now contain the details from your POST request.
        // You can check it by logging it in the console
        console.log(MyData)
      }).fail(function(){
          alert('The Ajax call has failed')
    });
});

Answer 3

Answer №2

Ensure that your src1 variable is accessible within the scope. One way to achieve this, although not recommended, is to declare src as a global variable directly inside your script tag.

Although using global variables is generally discouraged for various reasons, once it is functioning correctly, consider refining the code by declaring src in a more local scope or within a namespace.

Additionally, confirm whether the variable is named src or src1.

Answer 4

Ensure that your src1 variable is accessible within the scope. One way to achieve this, although not recommended, is to declare src as a global variable directly inside your script tag.

Although using global variables is generally discouraged for various reasons, once it is functioning correctly, consider refining the code by declaring src in a more local scope or within a namespace.

Additionally, confirm whether the variable is named src or src1.

Learning how to access JavaScript variables within a Ruby on Rails view

Answer №1

Answer №2

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