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<?php

	$v = "riri";
	//echo $v;
	
	if ($_SERVER["REQUEST_METHOD"] == "POST") 
	{
	
		if ( !empty($_POST["quantity"])) 
		{
			//$nameErr = "Name is required";
			echo "++++++ " .$_POST["quantity"];
		} 
		else 
		{
		}
		
		if ( !empty($_POST["str_quantity"])) 
		{
			//$nameErr = "Name is required";
			echo "++++++ " .$_POST["str_quantity"];
		} 
		else 
		{
		}
	}
	
	

?>

<!DOCTYPE html>
<html>
<body>

<!--
<h2>Using The id Attribute in JavaScript</h2>
<p>JavaScript can access an element with a specified id by using the getElementById() method:</p>

<h1 id="myHeader">Hello World!</h1>
<button onclick="displayResult()">Change text</button>

<script>
function displayResult() 
{
  document.getElementById("myHeader").innerHTML = "Have a nice day!";
}
</script>

-->


<!--  action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" -->

<!-- <span class="error">* <?php echo $nameErr;?></span> -->

<form method = "POST" action= "<?php $_PHP_SELF ?>" >
  <label for="quantity">Nombre</label>
  <input type="number" id="quantity" name="quantity" >
  
  <label for="quantity">Texte</label>
  <input type="text" id="str_quantity" name="str_quantity" >
  
  <input type="submit" value="Submit">
</form>

https://www.w3schools.com/php/php_ajax_php.asp   a voir 



<label>Affecte une valeur (name)</label><br />
<input type="text" name="firstName" />
<br/><br/>
<button onclick="read_name_val();">Lire la valeur (name)</button>
<button onclick="set_name_val();">Affecte la valeur (name)</button>

<br/><br/>

<label>Affecte une valeur (id)</label><br />
<input type="text" id="firstName" />
<br/><br/>
<button onclick="read_id_val();">Lire la valeur (id)</button>
<button onclick="set_id_val();">Affecte la valeur (id)</button>

<br/><br/>

<p id="p1"></p>

<br/><br/>

<label>Title</label><br />
<input id="myinput421" type="text" value="Computer Literacy">

<input type="text" name="field<?php echo $v;?>"  value="Cretin">


<input type="text" id="champ<?php echo $v;?>"  value="Avec  id">

<!--
name=" columntwo<?php echo $i;?>"
-->

<br/><br/>
<button onclick="show();">Show input value</button>

<button onclick="action();">Test</button>

<button onclick="f1();">Test</button>

<script>

	// le paragraphe reçoit le nouveau texte 
	document.getElementById("p1").innerHTML = "New text!";


	// je donne une valeur par défaut en utilsant le name
	document.getElementsByName("firstName")[0].value = "je donne une val " ;
	// je donne une valeur par défaut en utilsant l'id
	document.getElementById("firstName").value = "non define";
	
	function read_name_val() 
	{
		let res = document.getElementsByName("firstName")[0].value
		alert("Valeur = " + res);
	}
	
	function set_name_val() 
	{
		document.getElementsByName("firstName")[0].value = "J'affecte ..." ;
	}
	
	function read_id_val() 
	{
		let input = document.getElementById("firstName").value;
		alert("Valeur = " + input);
	}
	
	function set_id_val() 
	{
		document.getElementById("firstName").value = "Insertion";
	
	}
	
	
	
	function show() {
    let input = document.getElementById("myinput421");
    alert("Value = " + input.value);
  }
	
  function show() {
    let input = document.getElementById("myinput421");
    alert("Value = " + input.value);
  }
  
  function action() {
    //let input = document.getElementsByName("fieldriri");
	
	// OK
	//alert(document.getElementsByName("fieldriri")[0].value);
	
	let res = document.getElementsByName("fieldriri")[0].value
	alert("Valeur = " + res);
	
   // alert("Value = " + input[0].tagName);
  }
  
  function f1() 
  {
	let input = document.getElementById("champriri");
    alert("Retour  = " + input.value);
  }
  
</script>

</body>
</html>