Я запропонував цей параметр, який пояснює, як повністю налаштувати кнопку перегляду, включивши обробник завантаженого імені файлу, також налаштованого. Він додає додаткові поля та елементи управління на стороні клієнта лише для того, щоб показати, як включити перегляд у "справжній" формі, а не лише окрему.
Ось коден: http://codepen.io/emiemi/pen/zxNXWR
JS:
//click on our custom btn triggers a click on the hidden actual file input
$("#btnup").click(function(){
$("#fileup").click();
});
//changes on the three fields (input, tit,and name) trigger a control which checks if the 3 fields are all filled and if file field is valid (an image is uploaded)
$('#fileup').change(function(){
var formDOMObj = document.upload;
//here we assign tu our text field #fileup the name of the selected file
var res=$('#fileup').val();
var arr = res.split("\\");
//if file is not valid we show the error icon and the red alert
if (formDOMObj.fileup.value.indexOf(".jpg") == -1 && formDOMObj.fileup.value.indexOf(".png") == -1 && formDOMObj.fileup.value.indexOf(".jpeg") == -1 && formDOMObj.fileup.value.indexOf(".bmp") == -1 && formDOMObj.fileup.value.indexOf(".JPG") == -1 && formDOMObj.fileup.value.indexOf(".PNG") == -1 && formDOMObj.fileup.value.indexOf(".JPEG") == -1 && formDOMObj.fileup.value.indexOf(".BMP") == -1){
$( ".imgupload" ).hide("slow");
$( ".imguploadok" ).hide("slow");
$( ".imguploadstop" ).show("slow");
$('#nomefile').css({"color":"red","font-weight":700});
$('#nomefile').html("The file "+arr.slice(-1)[0]+" is not an image!");
$( "#bottone" ).hide();
$( "#fakebtn" ).show();
}else{
//if file is valid we show the green alert
$( ".imgupload" ).hide("slow");
$( ".imguploadstop" ).hide("slow");
$( ".imguploadok" ).show("slow");
$('#nomefile').html(arr.slice(-1)[0]);
$('#nomefile').css({"color":"green","font-weight":700});
if (formDOMObj.nome.value!=""&&formDOMObj.tit.value!=""&&formDOMObj.fileup.value!=""){
//if all three fields are valid the fake input btn is hidden and the actual one i s finally hown
$( "#fakebtn" ).hide();
$( "#bottone" ).show();
}
}
});
$('#nome').change(function(){
//same as file change but on name field
var formDOMObj = document.upload;
if (formDOMObj.nome.value!=""&&formDOMObj.tit.value!=""&&formDOMObj.fileup.value!=""){
$( "#fakebtn" ).hide();
$( "#bottone" ).show();
}else{
$( "#bottone" ).hide();
$( "#fakebtn" ).show();
}
});
$('#tit').change(function(){
//same as file change but on tit field
var formDOMObj = document.upload;
if (formDOMObj.nome.value!=""&&formDOMObj.tit.value!=""&&formDOMObj.fileup.value!=""){
$( "#fakebtn" ).hide();
$( "#bottone" ).show();
}else{
$( "#bottone" ).hide();
$( "#fakebtn" ).show();
}
});
HTML:
<form name="upload" method="post" action="/" enctype="multipart/form-data" accept-charset="utf-8">
<div class="row">
<div class="col-md-6 center">
<!--this is the actual file input, s hidden beacause we wanna use our custom one-->
<input type="file" value="" class="hidden" name="fileup" id="fileup">
<div class="btn-container">
<!--the three icons: default, ok file (img), error file (not an img)-->
<h1 class="imgupload"><i class="fa fa-file-image-o"></i></h1>
<h1 class="imguploadok"><i class="fa fa-check"></i></h1>
<h1 class="imguploadstop"><i class="fa fa-times"></i></h1>
<!--this field changes dinamically displaying the filename we are trying to upload-->
<p id="nomefile">Only pics allowed! (jpg,jpeg,bmp,png)</p>
<!--our custom btn which triggers the actual hidden one-->
<button type="button" id="btnup" class="btn btn-primary btn-lg">Browse for your pic!</button>
</div>
</div>
<!--additional fields-->
<div class="col-md-6">
<div class="row">
<div class="form-group" id="top">
<div class="col-md-12">
<input type="text" maxlength="100" class="form-control" name="nome" id="nome" placeholder="Your Name">
</div>
</div>
</div>
<div class="row">
<div class="form-group">
<div class="col-md-12">
<input type="text" maxlength="50" class="form-control" name="tit" id="tit" placeholder="I am rubber, you are glue">
</div>
</div>
</div>
<div class="row">
<div class="col-md-8">
<p class="white">All fields are mandatory</p>
</div>
<div class="col-md-4">
<!--the defauld disabled btn and the actual one shown only if the three fields are valid-->
<input type="submit" value="Submit!" class="btn btn-primary" id="bottone" style="padding-left:50px; padding-right:50px; display:none;">
<button type="button" class="btn btn-default" disabled="disabled" id="fakebtn" style="padding-left:40px; padding-right:40px;">Submit! <i class="fa fa-minus-circle"></i></button>
</div>
</div>
</div>
</div>
