The initial trigger for clicking the input file on a modal when the first page loads does not activate

Question

The initial trigger for clicking the input file on a modal when the first page loads does not activate

With the utilization of angularJS, I have a modal set up to prompt an input file for uploading purposes.

Below is the function responsible for initiating the click:

function initiateFileUpload()
{
    inputFile = document.createElement('input');
    inputFile.type = 'file';
    inputFile.onchange = fileSelected;
    inputFile.click();
}

The issue that has been puzzling me is that upon the initial page load, when I open the modal, the trigger does not activate. However, if I close the modal and reopen it, the trigger successfully activates and continues to work until the next page load. What could potentially be causing this malfunction on the first page load?

This peculiar behavior seems to only occur in Chrome. In contrast, Firefox, Edge, and Internet Explorer all execute the trigger consistently, even after a page reload...

javascript angularjs file-upload

Answer 1

Answer №1

Just to clarify, I have no experience with Angular so I resorted to using vanilla JavaScript since you didn't share any other code.

Based on my analysis, the error in your code doesn't seem to originate from the portion you provided. I integrated your function into a section of code sourced from W3Schools How to Make a Modal Box With CSS and JavaScript, where it successfully triggered the modal upon button click (tested on Chrome).

// Accessing the modal
var modal = document.getElementById('myModal');

// Fetching the button that opens the modal
var btn = document.getElementById("myBtn");

// Locating the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// The variable inputFile isn't defined within the given code snippet, so I assumed its existence elsewhere.
var inputFile;

// When the user clicks the button, display the modal and evoke your file input creation method.
btn.onclick = function() {

    modal.style.display = "block";
    
    triggerUploadMethod();
    
}

// Close the modal when the user clicks the <span> (x)
span.onclick = function() {
    modal.style.display = "none";
}

// Close the modal if the user clicks outside it
window.onclick = function(event) {
    if (event.target == modal) {
        modal.style.display = "none";
    }
}

// Create the input element and simulate a click event.
function triggerUploadMethod() {

  inputFile = document.createElement('input');
  inputFile.type = 'file';
  
  // Unable to include this line as the purpose is unclear.
  //inputFile.onchange = photoChosen;
  
  inputFile.click();

}

/* Style for the Modal (background) */
.modal {
    display: none; /* Initially hidden */
    position: fixed; /* Fixed positioning */
    z-index: 1; /* Topmost layer */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scrolling if necessary */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black with opacity */
}

/* Styling for the Modal Content/Box */
.modal-content {
    background-color: #fefefe;
    margin: 15% auto; /* Positioned 15% from top, centered horizontally */
    padding: 20px;
    border: 1px solid #888;
    width: 80%; /* Adjustable based on screen size */
}

/* Customize the Close Button */
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

<!-- Trigger/Open The Modal -->
<button id="myBtn">Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- Modal content -->
  <div class="modal-content">
    <span class="close">&times;</span>
    <p>Some text in the Modal..</p>
  </div>

</div>

Answer 2

Just to clarify, I have no experience with Angular so I resorted to using vanilla JavaScript since you didn't share any other code.

Based on my analysis, the error in your code doesn't seem to originate from the portion you provided. I integrated your function into a section of code sourced from W3Schools How to Make a Modal Box With CSS and JavaScript, where it successfully triggered the modal upon button click (tested on Chrome).

// Accessing the modal
var modal = document.getElementById('myModal');

// Fetching the button that opens the modal
var btn = document.getElementById("myBtn");

// Locating the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// The variable inputFile isn't defined within the given code snippet, so I assumed its existence elsewhere.
var inputFile;

// When the user clicks the button, display the modal and evoke your file input creation method.
btn.onclick = function() {

    modal.style.display = "block";
    
    triggerUploadMethod();
    
}

// Close the modal when the user clicks the <span> (x)
span.onclick = function() {
    modal.style.display = "none";
}

// Close the modal if the user clicks outside it
window.onclick = function(event) {
    if (event.target == modal) {
        modal.style.display = "none";
    }
}

// Create the input element and simulate a click event.
function triggerUploadMethod() {

  inputFile = document.createElement('input');
  inputFile.type = 'file';
  
  // Unable to include this line as the purpose is unclear.
  //inputFile.onchange = photoChosen;
  
  inputFile.click();

}

/* Style for the Modal (background) */
.modal {
    display: none; /* Initially hidden */
    position: fixed; /* Fixed positioning */
    z-index: 1; /* Topmost layer */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scrolling if necessary */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black with opacity */
}

/* Styling for the Modal Content/Box */
.modal-content {
    background-color: #fefefe;
    margin: 15% auto; /* Positioned 15% from top, centered horizontally */
    padding: 20px;
    border: 1px solid #888;
    width: 80%; /* Adjustable based on screen size */
}

/* Customize the Close Button */
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

<!-- Trigger/Open The Modal -->
<button id="myBtn">Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- Modal content -->
  <div class="modal-content">
    <span class="close">&times;</span>
    <p>Some text in the Modal..</p>
  </div>

</div>

The initial trigger for clicking the input file on a modal when the first page loads does not activate

Answer №1

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