Sending a variable to ASP using JSON parsing

In the VB Code behind, there is a function that uses parameters to output a datatable, which is then used in the front end to place markers on Google Maps. The requirement from the front end is to send a user-entered variable.

Javascript Pseudo:

if (a = true){
    var varName = inputBox.value;
    var passer1 = chkCondition1();
    var passer2 = chkCondition2();

    if (passer1 == true && passer2 == true) {
        Coordinates = JSON.parse('<%=ConvertTabletoString(varName) %>');
    }
else {
    //do other stuff
     }

An error message is appearing:

Error 2 'varName' is not declared. It may be inaccessible due to its protection level.

The solution to this issue is currently unclear. Is there any alternate way to proceed?

javascriptasp.netjsonvb.net

Answer №1

The root cause of the issue you are facing is that the variable required on the server-side is non-existent both on the server and the client side at the specific point you are trying to access it. Essentially, you are attempting to access a variable on the server that will only be created on the client side, but your attempt is made before any content is rendered in the user's browser.

  1. To resolve this, utilize AJAX to send the value to the server-side.

  2. Implement a server-side API function that can process your command upon arrival to the server and provide the necessary JSON data back to the client-side.

  3. Parse the response JSON within your AJAX callback function.

  4. Reap the benefits.

Answer №2

The reason for the error is due to "varName" being a client-side variable.

If "inputBox" is a server control, you can retrieve its value directly from the ConvertTabletoString() method.

If not, consider using a hidden field with runat="server" and assign inputBox.value to it. This way, you can access the hidden field's value within your server-side method.

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