Pass information to a JavaScript file without resorting to global variables

Question

Pass information to a JavaScript file without resorting to global variables

I am looking for a way to transfer information from an HTML page to a script file that is contained within the same page. My initial thought was to use a global variable defined in the page and then accessed in the script file.

However, I understand that using global state is generally discouraged due to potential issues. So, I have been exploring alternative methods for passing data from the HTML page to the script file without relying on global variables. Unfortunately, I have not come across any solutions so far.

I am wondering if there are other possibilities for accomplishing this task. Any suggestions or thoughts would be greatly appreciated?

javascript

Answer 1

Answer №1

When considering your approach, it's important to evaluate the specific task at hand. While I typically wouldn't recommend this particular method, it may be worth exploring based on your individual situation. For the purposes of illustration, let's assume you are utilizing jQuery (if not, simply replace the document.ready with an alternative for monitoring onDOMReadyStateChange).

Within the HTML:

<script type='text/json-data' id='some_data_set'>
  { 'foo': 'bar', 'baz': 1 }
</script>

Within the JavaScript:

$(function() {
  var myData = JSON.parse($('script#some_data_set').html());
  // YOUR CODE GOES HERE
});

Answer 2

When considering your approach, it's important to evaluate the specific task at hand. While I typically wouldn't recommend this particular method, it may be worth exploring based on your individual situation. For the purposes of illustration, let's assume you are utilizing jQuery (if not, simply replace the document.ready with an alternative for monitoring onDOMReadyStateChange).

Within the HTML:

<script type='text/json-data' id='some_data_set'>
  { 'foo': 'bar', 'baz': 1 }
</script>

Within the JavaScript:

$(function() {
  var myData = JSON.parse($('script#some_data_set').html());
  // YOUR CODE GOES HERE
});

Answer 3

Answer №2

Incorrect. In JavaScript, the scope begins at a global level, meaning that you need to have at least one global variable for your data.

For instance, if you wish to store a list of products and events:

var myGlobalData = { "products":<products>, "events":<events> };

Here, <products> and <events> represent two distinct data blocks.

If you are wary of global objects, you can remove the reference point (along with its contents) once you are done utilizing it:

delete window.myGlobalData;

Answer 4

Incorrect. In JavaScript, the scope begins at a global level, meaning that you need to have at least one global variable for your data.

For instance, if you wish to store a list of products and events:

var myGlobalData = { "products":<products>, "events":<events> };

Here, <products> and <events> represent two distinct data blocks.

If you are wary of global objects, you can remove the reference point (along with its contents) once you are done utilizing it:

delete window.myGlobalData;

Answer 5

Answer №3

To restrict access to your data, one approach is to create a scope. For instance, within a JavaScript file, you can establish an object as shown below:

var handler = { 
  function sendData(obj) { // perform actions
  }  
};

By doing this, in your HTML code, you have the assurance that the data is contained within the handler. This enables you to execute commands like the following:

handler.sendData({someInfo});

Answer 6

To restrict access to your data, one approach is to create a scope. For instance, within a JavaScript file, you can establish an object as shown below:

var handler = { 
  function sendData(obj) { // perform actions
  }  
};

By doing this, in your HTML code, you have the assurance that the data is contained within the handler. This enables you to execute commands like the following:

handler.sendData({someInfo});

Pass information to a JavaScript file without resorting to global variables

Answer №1

Answer №2

Answer №3

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