Javascript / HTML adding an image to center position on the mouse click

Question

Javascript / HTML adding an image to center position on the mouse click

608 views Asked by Jayson Hanlon At 19 October 2020 at 23:55

I want to print out a picture whenever the mouse is clicked on the screen. This is my current Javascript and HTML code. It only prints the h1, I don't know what I am doing wrong.

var image = document.getElementById("im"); // idenfitifes span eleme nt                                                                                                                                   
var roll = false; // to know the image is moving or not , intitally it is not moving state hence value is false                                                                                           
image.addEventListener("mousedown", start, false); // at starting image is in rest                                                                                                                        

function mouse_move(x) // funciton to move image with mouse                                                                                                                                               
{
    var newX = x.clientX; // copies mouse x position                                                                                                                                                      
    var newY = x.clientY; // copies mouse y position                                                                                                                                                      
    image.style.left = newY + "px"; // assigns latest mouse position to span (image)                                                                                                                      
    image.style.top = newX + "px";
}

function start(x) // span (image) starting no rolling mode                                                                                                                                                
{
    if(roll){ // when the mouse is moving                                                                                                                                                                 
        document.removeEventListener("mousemove", mouse_move); // initiages image span move                                                                                                               
        roll = !roll;
        return;
    }
    roll = !roll; // when the mouse is not moving                                                                                                                                                         
    document.addEventListener("mousemove", mouse_move, false);
}

<!DOCTYPE html>

<html lang="en">

<head>
<meta charset="utf-8" />

<title> Picture of Me! </title>

</head>

<body>
  <h1> HTML File to move image along with mouse movement. </h1>
  <script type="text/javascript" src="h5j.js">

  <span id="im">
    <img src="https://static01.nyt.com/images/2020/04/27/us/politics/00-trump-cand-page/00-trump-cand-page-mediumSquareAt3X.jpg" height="120" width="120"></img>
  </span>
</body>
</html>

Original Q&A

There are 2 answers

**kokhta shukvani** · Answer 1 · 2020-10-20 00:28:00

You Use The AddEventListener Function Like This

document.addEventListener("mousedown", mouse_move, false);

the syntax for addEventListener is: addEventListener("Event Name", "Your Function name, the function you want to run after event happening")

when you need to run in the click event, you simply need to change Event name from "mousedown" to "click" , example: document.addEventListener("click", mouse_move, false);

you have to use "click" event instead of "mousedown" like: document.addEventListener("click", mouse_move, false);

<code>
        var image = document.getElementById("im"); 
            var roll = false; 
           image.addEventListener("click", start, false); 
    
            function mouse_move(x) 
            {
                var newX = x.clientX; // copies mouse x position
                var newY = x.clientY; // copies mouse y position
                image.style.left = newX + "px";
                image.style.top = newY+ "px";
            }
    
            function start(x) // span (image) starting no rolling mode
            {
                if (roll) { // when the mouse is moving
                    document.removeEventListener("click", mouse_move); // initiages image span move
                    roll = !roll;
                    return;
                }
                roll = !roll; // when the mouse is not moving
    
            }
            document.addEventListener("click", mouse_move, false);
</code>

**Josh Bonnick** · Answer 2 · 2020-10-20 00:04:59

It looks like your trying to get the image element by id, before the DOM has finished loading.

I would suggest one of the following:

Move the <script> tag to the bottom of the page between </body> and </html>
Add defer to the <script> tag, which will cause the script to be loaded after the DOM.
Move the first block of your JavaScript into a DOMContentLoaded event listener as shown below.

var roll = false;
var image;

document.addEventListener('DOMContentLoaded', function(){
    image = document.getElementById("im");                                                                                      
    image.addEventListener("mousedown", start, false);  
});

TechQA.

Javascript / HTML adding an image to center position on the mouse click

There are 2 answers

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