Leveraging a JavaScript variable declared outside the function to successfully transfer data to my AJAX function

Question

Leveraging a JavaScript variable declared outside the function to successfully transfer data to my AJAX function

Every time the enter key is pressed, my AJAX function gets executed. I used to pass a set of javascript variables equal to elements in the HTML (the contents of a text area) as data for the AJAX function. Now, I want these JS variables to hold values from other JS variables outside the function.


function stream() {
    var line_Number = $('#lineNumber').val();
    var post_code = '#lineText';
    var post_id = $('#Streamid').val();
    
    if (post_code != ''){
        $.ajax({
            url: "post-code.php",
            method: "POST",
            data: {lineText: post_code, lineNumber: line_Number},
            dataType: "text",
            
            success: function(data){
                if(data != ''){
                    $('#Streamid').val(data);
                }
                $('#autoStream').text("Sending data");
                
                setInterval(function(){
                    $('#autoStream').text('');
                }, 100);
            }
        });
    }
}

Another function then triggers the AJAX function.

Here are the JS variables I want to use and pass into the AJAX function:


var text;
var lineNumber;
var lineText;
var numOfSpaces;

function update(e) {
    text = //code
    lineNumber = //code
    lineText = //code

I omitted showing the code for each variable to keep things simple.

javascript ajax

Answer 1

Answer №1

It seems like you're asking about a few different options for handling variables in your code:
1- One option is to use a hidden HTML element:

<input type="hidden" id="someVariable">

You can initialize this variable in your script using JQuery:

$('#someVariable').val(myVar)

Then, in your ajax function, you can access this variable like so:

var myVar = $('#someVariable').val()

2- It's important to note that if a variable is declared outside of a function in javascript, its scope is the whole document (window).
3- Another option is to pass arguments to your ajax function, like this:

function stream(firstVariable, secondOne, ...)

Answer 2

It seems like you're asking about a few different options for handling variables in your code:
1- One option is to use a hidden HTML element:

<input type="hidden" id="someVariable">

You can initialize this variable in your script using JQuery:

$('#someVariable').val(myVar)

Then, in your ajax function, you can access this variable like so:

var myVar = $('#someVariable').val()

2- It's important to note that if a variable is declared outside of a function in javascript, its scope is the whole document (window).
3- Another option is to pass arguments to your ajax function, like this:

function stream(firstVariable, secondOne, ...)

Answer 3

Answer №2

If you want to simplify your code, consider creating a JSON array and passing it as a parameter to your AJAX function. This will help avoid unnecessary lines of code. See the example below:

let params = {
    "line_number": $('#lineNumber').val(),
  "post_code" : '#lineText',
  "post_id" : $('#Streamid').val()
};



 function stream(params)
{
    if (params.post_code != ''){

    $.ajax({
      url: "post-code.php",
      method: "POST",
      data: data,
      dataType: "text",
      success: function(data){
        if(data != ''){
          $('#Streamid').val(data);
        }
        $('#autoStream').text("Sending data");
          setInterval(function(){
            $('#autoStream').text('');
          }, 100);
      }
    });
  }
}

I hope this explanation proves useful to you.

Answer 4

If you want to simplify your code, consider creating a JSON array and passing it as a parameter to your AJAX function. This will help avoid unnecessary lines of code. See the example below:

let params = {
    "line_number": $('#lineNumber').val(),
  "post_code" : '#lineText',
  "post_id" : $('#Streamid').val()
};



 function stream(params)
{
    if (params.post_code != ''){

    $.ajax({
      url: "post-code.php",
      method: "POST",
      data: data,
      dataType: "text",
      success: function(data){
        if(data != ''){
          $('#Streamid').val(data);
        }
        $('#autoStream').text("Sending data");
          setInterval(function(){
            $('#autoStream').text('');
          }, 100);
      }
    });
  }
}

I hope this explanation proves useful to you.

Leveraging a JavaScript variable declared outside the function to successfully transfer data to my AJAX function

Answer №1

Answer №2

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