<style>
body{width:610px;}
#uploadForm {border-top:#F0F0F0 2px solid;background:#FAF8F8;padding:10px;}
#uploadForm label {margin:2px; font-size:1em; font-weight:bold;}
.demoInputBox{padding:5px; border:#F0F0F0 1px solid; border-radius:4px; background-color:#FFF;}
#progress-bar {background-color: #12CC1A;height:20px;color: #FFFFFF;width:0%;-webkit-transition: width .3s;-moz-transition: width .3s;transition: width .3s;}
.btnSubmit{background-color:#09f;border:0;padding:10px 40px;color:#FFF;border:#F0F0F0 1px solid; border-radius:4px;}
#progress-div {border:#0FA015 1px solid;padding: 5px 0px;margin:30px 0px;border-radius:4px;text-align:center;}
#targetLayer{width:100%;text-align:center;}

</style>
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<link href="http://code.jquery.com/ui/1.10.4/themes/ui-lightness/jquery-ui.css" rel="stylesheet">
<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
<script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>

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<script>
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<script type="text/javascript">

function bascule(val)
{
			document.getElementById('overwrite').value = val;
}

$(document).ready(function() { 
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	 {	
				if($('#fichier').val()) 
				{
					e.preventDefault();
					
					var flag = false;
					
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					var  mega = 1048576;
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						return false
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					else
					{
							e.preventDefault();
							
							var fichier = "2.jpg"; //document.getElementById('fichier').value;
							var data = 'fichier='+ fichier;
							
						
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								({
									type: "POST",
									url: "verif_fichier.php",
									data: data,
									cache: false,
									success: function(html)
									{
										if(html == "existe")
										{
													
													$( "#fenetre_renomer" ).dialog({
																	modal: true,
																	title: "Renomer",
																	buttons: {
																				Valider: function()
																				{
																					$( this ).dialog( "close" );
																					envoi();
																					
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																					etat = document.getElementById('overwrite').value; 
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																							$(this).valid();
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																					//fichier = document.getElementById('fichier').value;
																					
																					/*
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																						alert("on écrase ...");
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																				{
																					$( this ).dialog( "close" );
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													if(flag == true)
													{
														alert("hjkhg");

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							{
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									target:   '#targetLayer', 
									beforeSubmit: function() {
									  $("#progress-bar").width('0%');
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function envoi()
{
		fichier = document.getElementById('nouveau_nom').value;
		alert(fichier);    
			
       /* $.ajax({
            url: "sauve_session.php", 
            type: 'post',
            data: 'nouveau_nom=' + fichier; // + '&chemin=' + chemin,
            dataType: 'html', 
            success: function (response) 
			{
				alert(response);
				
            },
            error : function(request) {
                console.log(request.responseText);
            }
        }); */
}
		

}); 

</script>
<form id="uploadForm" action="upload.php" method="post">
<div>
<label>Upload Image File:</label>
<input name="fichier" id="fichier" type="file" value = "zorro" class="demoInputBox" />
</div>
<div><input type="submit" id="btnSubmit" value="Submit" class="btnSubmit" /></div>
<div id="progress-div"><div id="progress-bar"></div></div>
<div id="targetLayer"></div>
</form>
<div id="loader-icon" style="display:none;"><img src="LoaderIcon.gif" /></div>

<div id="output"></div>


				<div id="fenetre_renomer"  style="display: none">
				<form>
				<label>Nouveau nom: </label>
				<input type="text" name="nouveau_nom" id="nouveau_nom" />
				<br/>
				<br/>
				
				<input type="radio" name="overwrite" id="overwrite" value="ecrase" onclick="bascule('ecrase')" checked />Ecraser 
				<input type="radio" name="overwrite" id="overwrite" value="change" onclick="bascule('change')" /> Changer le nom
				
				<br/>
				<br/>
				</div>

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http://zinoui.com/blog/ajax-request-progress-bar				

addEventListener

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