Pass javascript variable obtained from combobox to php without redirecting to another page

Question

I get a value from combobox using javascript and I need it to make a query and fill another combobox from data fron the database.

This is how I get the value:

<select name="state" onchange="getValue(this)">
                <option value="0">Provincia</option>
                <option value="1">San José</option>
                <option value="2">Alajuela</option>
                <option value="3">Cartago</option>
                <option value="4">Heredia</option>
                <option value="5">Guanacaste</option>
                <option value="6">Puntarenas</option>
                <option value="7">Limón</option>
              </select>

              <script>
                function getValue(obj){
                   //Pass value to php
                    alert(obj.value);
                }

I want to put the value within a variable without refreshing nor redirecting to another page

take a look here

gaetanoM
– gaetanoM

2019-02-11 20:51:41 +00:00
Commented Feb 11, 2019 at 20:51 — gaetanoM
– gaetanoM, Commented Feb 11, 2019 at 20:51

hashrocket · Accepted Answer · 2019-02-11 22:57:04Z

1

You need to use AJAX to send your data from JavaScript to PHP. AJAX stands for Asynchronous JavaScript and XML and basically lets you request server side code asynchronously. You can also send data along with your asynchronous request:

let url; //your filepath to your php script
let param; //the value you want to send along
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
  if (this.readyState == 4 && this.status == 200) {
    //do something with the request
  }
};
xhttp.open("POST", url, true);
xhttp.send(param);

edited Feb 11, 2019 at 22:57

hashrocket

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answered Feb 11, 2019 at 21:00

zynth666

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3 Comments

Errol Chaves Moya Over a year ago

I cannot redirect to another page or the same page beacuse the form gets closed

zynth666 Over a year ago

Could you try and explain your problem better?

Errol Chaves Moya Over a year ago

the form I have is like a pop up windows and if I try to reload the page the form gets closed

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