Creating a cascading select box with two levels in PHP and MySQLExplanation on how to generate a two-tier connected

While I have successfully retrieved values from a MySQL database using a select box in PHP, I am struggling with implementing a two-level chained select box.

Does anyone have any sample code or suggestions on how to achieve this?

Thank you.

Answer №1

If you're working on client-side tasks, JavaScript will be your go-to for this.

<input type="checkbox" name="chck_1" id="chck_1" onclick="javascript:setValue('chck_2');"/> Checkbox 1
<input type="checkbox" name="chck_2" id="chck_2"> Checkbox 2

To achieve this in JavaScript, create a function like so:

function setValue(element)
{
  var fieldElement = document.getElementById(element);
  if(fieldElement.checked)
  {
    fieldElement.checked = false;
  }
  else
  {
    fieldElement.checked = true;
  }
}

I haven't tested the code, but it should work 😉

Edit: I may have misunderstood your original message, but a similar tactic can also be applied to select boxes. You could populate them with relevant data based on the selection made in the first select box at a specified index or something.

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