Develop Reference

In HTML, how can I build a file picker that can change the image displayed without using action listener?

This is what I have in HTML:
<img src="images/defaultProfile.jpg" id="image">
<input type="file" name="pic" accept="image/*" id="imgPath">
<input type="submit" onclick="uploadImg()">
The image with an id of "image" automatically loads a default image from a designated directory by default. Then, the user can I pick an image from the file picker. When the user hits the submit button written on the last line, The uploadImg() written on javaScript file will get the image from input and change the image displayed.
But, my question is how I can enable the user to change the image by just picking a image file from the directory without hitting the "submit" button.

You can add a change listener to the image input:
document.querySelector('#imgPath').onchange = () => {
console.log('Now uploading...');
// uploadImg();
};
<input type="file" name="pic" accept="image/*" id="imgPath">

Take a look at this Why can't I do <img src="C:/localfile.jpg">?. If your plan is to display an image before uploading to the server, that is not going to work. What you can do is write an "onchange" event (https://www.w3schools.com/jsref/event_onchange.asp) to your file selection input line (2nd line in your code), and upload it to a temporary directory and display it. As the user clicks on the upload button, you can make the change permanent. If the user cancels, you will display the default profile page.

How can attach uploaded image to file input as already uploaded

I have input with <input type="file" id="logo" name="logo" ng-model="logo" required="required">. When I load page it is like:
When I select file:
How can I load the page, so that already saved file in server retrieved gets like:
Not this:

How to show the image uploaded using HTML file control on a new page after form submission in PHP?

I've a form which contains following file upload control and image control:
<form action="rebate_preview.php" role="form" method="post" enctype="multipart/form-data">
<input type="hidden" name="hidden_path" id="hidden_path" value="">
<input type="file" name="rebate_image" id="rebate_image">
<img id="rebate_old_image" src="#" alt="your image" width="80" height="80"/>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
Here I'm enabling the user to see the preview of the image he selected for upload without actually uploading the image to server using following jQuery code :
$(document).ready(function() {
function readURL(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
$('#rebate_old_image').attr('src', e.target.result);
$('#hidden_path').val(e.target.result)
}
reader.readAsDataURL(input.files[0]);
}
}
$("#rebate_image").change(function(){
readURL(this);
});
});
Now the problems I'm facing is I'm not able to show the same image preview on the next page i.e. on a file "rebate_preview.php" after form submission using image control. The next issue I'm facing is how should I store the values from array $_FILES on the page rebate_preview.php?
Remember still the image uploaded by user is not yet uploaded to the server.
The page rebate_preview.php is just a preview page with some other fields to preview the details.
How should I show this image on the page rebate_preview.php using image control and how should I store the $_FILES array data?

I had this problem a short while back when I was building an application, the best thing to create an OBJECT URL from the selected image when you select the file, you can then set your img src to that OBJECT URL data, which will render it to the page, for example lets say you have a file input with the id image_file. you could do this:
// Preview the image on the page
$('#image_file').change(function(e) {
var selected_file = $('#image_file').get(0).files[0];
selected_file = window.URL.createObjectURL(selected_file);
$('#preview_image').attr('src' , selected_file);
});
The source is now the BLOB representation of the image, you can then submit your form to upload the image or select another image to update the preview, hope this helps :)

Simple Solution?
in PHP script just do:
print "<img src='".$_POST['hidden_path']."'>";

Show loading image while its uploading?

I have an image upload form, which auto uploads the image when user selects the file.
Upload form
<form id="imageupload" action="./uploadres.php" enctype="multipart/form-data" method="post">
<input type="file" name="file" value="Ekle" accept="image/*" size="20">
</form>
Auto upload script when user selected file
$("input[name='file']").change(function() {
this.form.submit();
});
Show/hide loading image function:
$('#loadimg').show();
$('#contents').load(function(){
$('#loadimg').hide();
});
What I am trying to do is showing loading image while its uploading. What is the correct way to integrate the Show/hide loading image method into my form submit ?

If you are doing a full HTML post, then you only have one option:
Using the form's onsubmit event to display the uploading symbol. This will be cleared when the new HTML is downloaded.
On the other hand, if you are using jQuery to submit the form, there are a several excellent ways to handle that.
I'd point you to this discussion for an overview.

upload a file without having the submit button in mvc

I want to upload a file without using the submit button. The file must be uploaded at the moment the user picks it from browse file window.
Now please do provide some ajax code or some jquery to upload the file and also how to delete the file.
Please provide the control view for this.
View>>>
<form action="FileUploadPost" method="post" enctype="multipart/form-data">
<label for="file1">Filename1:</label>
<input type="file" name="files" id="file3" />
<label for="file2">Filename2:</label>
<input type="file" name="files" id="file4" />
</form>
Controller>>>
[HttpPost]
public ActionResult Index(IEnumerable<HttpPostedFileBase> files)
{
foreach (var file in files)
{
if (file.ContentLength > 0)
{
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(HttpContext.Server.MapPath("~/App_Data/Uploads"), fileName);
file.SaveAs(path);
}
}
return RedirectToAction("Index");
}

You can use JQuery file uploader control for your requirements.
It provides functionality to upload file with both "By Clicking on the button" and "Auto Upload".
Auto Upload : This functionality will upload file as soon as you select the file.
See Ajax File Upload for step by step implementation.