Hello everyone 
Am trying to a receive a number on my "ESP8266 Thing" from an html page via http request and print it on the serial monitor.
I have combined 2 sketch i found on the web and made my own it does the following:
1- turns a led on or off .
2-displays the value of a variable "analogue pin".
3-displays the state of the led on or off.
I have made a container that i can write numbers in it and use a send button on the web page to store it in a function called ('sendValue(val)').
My problem is i don't know how to convert the value inside this function and use it for example to set a Temperature or display it on the serial monitor.
If u could help 
i would gladly appreciate it ;D .
Thanks.
// Required libraries
#include <ESP8266WiFi.h>
// WiFi parameters
const char ssid[] = "******";//wifi username
const char password[] = "******";//wifi pass
const int ANALOG_PIN = A0; // The only analog pin on the Thing
//const int DIGITAL_PIN = 12; // Digital pin to be read
// Create an instance of the server
WiFiServer server(80);
// Pin
int output_pin = 5;
void setup() {
 // Start Serial
 Serial.begin(115200);
 delay(10);
 pinMode(output_pin, OUTPUT);
 digitalWrite(output_pin, LOW);
 // Connect to WiFi network
 Serial.println();
 Serial.println();
 Serial.print("Connecting to ");
 Serial.println(ssid);
 WiFi.begin(ssid, password);
 while (WiFi.status() != WL_CONNECTED) {
  delay(500);
  Serial.print(".");
 }
 Serial.println("");
 Serial.println("WiFi connected");
 // Start the server
 server.begin();
 Serial.println("Server started");
 // Print the IP address
 Serial.println(WiFi.localIP());
}
void loop() {
 // Check if a client has connected
 WiFiClient client = server.available();
 if (!client) {
  return;
 }
 // Wait until the client sends some data
 Serial.println("new client");
 while(!client.available()){
  delay(1);
 }
 // Read the first line of the request
 String req = client.readStringUntil('\r');
 Serial.println(req);
 client.flush();
 // Match the request
 if (req.indexOf("/on") != -1){
  digitalWrite(output_pin, HIGH);
  Serial.println("on led");
 }
 if (req.indexOf("/off") != -1) {
  digitalWrite(output_pin, LOW);
  Serial.println("off led");
 }
 /*if (req.indexOf("flash") != -1) {
  digitalWrite(output_pin, LOW);
  delay(500);
  digitalWrite(output_pin, HIGH);
  Serial.println("flash led");
 }*/
/*Â if (req.indexOf("/sendValue(val)") != -1) {
  char z="sendValue(val)";
  Serial.println(z);
  digitalWrite(output_pin, LOW);
  delay(500);
  digitalWrite(output_pin, HIGH);
  Serial.println("flash led");
 }
 */
 client.flush();
 // Prepare the response
 String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n";
 s += "<head>";
 s += "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">";
 s += "<script src=\"https://code.jquery.com/jquery-2.1.3.min.js\"></script>";
 s += "<link rel=\"stylesheet\" href=\"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css\">";
 s += "<META HTTP-EQUIV=refresh CONTENT=8>";
 s += "</head>";
 s += "<div class=\"container\">";
 s += "<h2>Door Control</h2>";
 s += "<input type='hidden' name='pin_status' id='pin_status' value='" + String(digitalRead(output_pin)) + "' />";
 s += "<div class='row'>";
 s += "<div class=\"col-md-2\"><input class=\"btn btn-block btn-lg btn-primary\" type=\"button\" value=\"On\" onclick=\"on()\"></div>";
 s += "<div class=\"col-md-2\"><input class=\"btn btn-block btn-lg btn-danger\" type=\"button\" value=\"Off\" onclick=\"off()\"></div>";
 //s += "<div class=\"col-md-2\"><input class=\"btn btn-block btn-lg btn-green\" type=\"button\" value=\"flash\" onclick=\"flash()\"></div>";
 s += "</div></div>";
 s += "
";
 s += "<div class='row'>";
 s += "<div class='col-md-3'>";
 s += "<h4>Analog Pin = <h4>";
 s += "</div>";
 s += "<div class='col-md-3'>";
 s += "<input type='button' class='btn btn-default btn-block' value='" + String(analogRead(ANALOG_PIN)) + "' />";
 s += "</div>";
 s += "<div class='col-md-3'>";
 s += "<input type='number' place-holder='input value' id='val_to_send' class='form-control' style='width:100%' />";
 s += "</div>";
 s += "<div class='col-md-3'>";
 s += "<input type='button' class='btn btn-default btn-block' value='Send' onClick=\"sendValue($('#val_to_send').val());\" />";
 s += "</div>";
 s += "</div>";
 //s += "Analog Pin = ";
 //s += String(analogRead(ANALOG_PIN));
 s += "
"; // Go to the next line.
 s += "<div id='pin_status_result'></div>";
 //s += String(digitalRead(output_pin));
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 s += "<script>";
 s += "$(document).ready(function()";
 s +="{";
 s += "if($('#pin_status').val() == '1'){";
 s += "$('#pin_status_result').text('Digital Pin 5 = ON');";
 s += "}else{";
 s += "$('#pin_status_result').text('Digital Pin 5 = OFF');";
 s += "}";
 s += "});";
 s += "function on()";
 s += "{";
 s += "$.get('on');";
 s += "}";
 s += "function off()";
 s += "{";
 s += "$.get('off');";
 s += "}";
 s += "function flash()";
 s += "{";
 s += "$.get('flash');";
 s += "}";
 s += "function sendValue(val)";
 s += "{";
 s += "$.get('sendValue(val)');";
 s += "}";
 s += "</script>";
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 // Send the response to the client
 client.print(s);
 delay(1);
 Serial.println("Client disconnected");
}