Expanding arrays with the push method in Javascript

Question

Expanding arrays with the push method in Javascript

I have set up a web form using HTML to collect user data. Once the user submits the form, I am using JavaScript to store this data in an array. Here is my current code:

function saveData(){
    var userName = document.getElementById('myName').value;

    var dataArray = ["dataOne"];
    dataArray.push("dataTwo");
    dataArray.push("dataThree");

    dataArray.push(userName);
}

THE PROBLEM: The data entered by the user gets saved at index 3 in the array, whereas I want each new user submission to be stored at the next available index (e.g., index 4, 5, and so on). Currently, every user input overrides the previous one. For example:

User 1 Submits:

[dataOne, dataTwo, dataThree, User 1 Input]

If User 2 Submits:

[dataOne, dataTwo, dataThree, User 2 Input]

As you can see, User 1's input has been replaced by User 2's input. I need each user's data to be stored separately.

If anyone has a solution, I would greatly appreciate it. Thank you!

javascript arrays push

Answer 1

Answer №1

The issue here is in the way you're handling the array within the function. Instead of redeclaring or overwriting it each time, consider implementing a solution like this:

var data = ["firstData"]; //\
data.push("secondData");   //>resulting in var data = ["firstData", "secondData", "thirdData"]
data.push("thirdData"); ///

function addData(){
    var newData =  document.getElementById('inputData').value;
    data.push(newData);
}

This approach ensures that each invocation of the function will append a new string to the existing array.

Furthermore, remember to use distinct names for functions and variables to avoid conflicts (both cannot be named data).

Answer 2

The issue here is in the way you're handling the array within the function. Instead of redeclaring or overwriting it each time, consider implementing a solution like this:

var data = ["firstData"]; //\
data.push("secondData");   //>resulting in var data = ["firstData", "secondData", "thirdData"]
data.push("thirdData"); ///

function addData(){
    var newData =  document.getElementById('inputData').value;
    data.push(newData);
}

This approach ensures that each invocation of the function will append a new string to the existing array.

Furthermore, remember to use distinct names for functions and variables to avoid conflicts (both cannot be named data).

Expanding arrays with the push method in Javascript

Answer №1

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