Enable the expansion of a div by dragging and dropping an image onto it

Question

Enable the expansion of a div by dragging and dropping an image onto it

Take a look at this fiddle. In this fiddle, I am able to drag and drop images onto the .drop-zone. However, I would like to enhance it so that when I drag an image onto it, the .drop-zone div expands to where I place the image. It's okay if the expanded area is scrollable.

<div class="drag"><img src="http://www.causingeffect.com/images/made/images/example/cow_50_50_c1.jpg" /></div>
<div class="drag"><img src="http://www.coffeecup.com/images/software/feature-icons/image_editing.png" /></div>
<div class="drag"><img src="http://www.neatimage.com/im/Neat-Image-Logo-64.png" /></div>

<div class="clear"></div>

<div class="drop-zone"></div>

JS

jQuery(function($) {

    $('.drop-zone').droppable({
        accept: '.drag',
        drop: function(event, ui) {
            var $clone = ui.helper.clone();
            if (!$clone.is('.inside-drop-zone')) {
                $(this).append($clone.addClass('inside-drop-zone').draggable({
                     containment: '.drop-zone'
                }));
            }
        }
    });

    $('.drag').draggable({
        helper: 'clone'
    });

});

CSS

.drop-zone{border: 1px solid #9C9898;height:350px;width:400px;margin:0 auto;margin-top: 10px; overflow:auto;}
.clear{clear:both;}

javascript jquery css jquery-ui

Answer 1

Answer №1

To identify the edges effectively, I have utilized child elements within the .drop-zone container. One challenge arises when you need to ensure that the .drop-zone element has a position: relative property which can interfere with drag-and-drop functionality. A solution to this issue is detailed in this guide found here. Moreover, it becomes apparent that during dragging, the mouseover event does not propagate across the .drag element, necessitating that the .drop-zone-edge elements have a higher z-index for proper display order. You can test the implementation here. Extend this technique to handle top, left, and right edges, while ensuring transparency for the .drop-zone-edge elements.

HTML Structure:

<div class="drop-zone">
    <div class="drop-zone-edge drop-zone-top"></div>
    <div class="drop-zone-edge drop-zone-bottom"></div>
</div>

CSS Styling:

.drag {
  z-index: 100;
}

.drop-zone-edge {
    width: 100%;
    height: 10px;
    background-color: red;
    position: absolute;    
    z-index: 200;
}

.drop-zone-top {
    top: 0;
}

.drop-zone-bottom {
    bottom: 0;
}

JavaScript Functionality:

var isClicked = false;

$(document).mousedown(function() {
    isClicked = true;
})
.mouseup(function() {
    isClicked = false;
});

$('.drop-zone').droppable({
    accept: '.drag',
    drop: function(event, ui) {
        var $clone = ui.helper.clone();
        if (!$clone.is('.inside-drop-zone')) {
            $(this).append($clone.addClass('inside-drop-zone').draggable({
                 containment: '.drop-zone'
            }));
        }
        var parent = $('.drop-zone');
        var leftAdjust = $clone.position().left - parent.offset().left;
        var topAdjust = $clone.position().top - parent.offset().top;
        $clone.css({left: leftAdjust, top: topAdjust});
    }
});

$('.drag').draggable({
    helper: 'clone'
});

var shouldEnlargedBottom = false;
$('.drop-zone-bottom').on('mouseover', function(e) {
    if(isClicked) {
        shouldEnlargedBottom = true;
    }
});

$('.drop-zone-bottom').on('mouseout', function(e) {
    shouldEnlargedBottom = false;
});

function enlargeArea() {
    if(shouldEnlargeBottom) {
        var newHeight = $('.drop-zone').height() + 3;
        $('.drop-zone').height(newHeight);
    }
}

setInterval(enlargeArea, 100);

Answer 2

To identify the edges effectively, I have utilized child elements within the .drop-zone container. One challenge arises when you need to ensure that the .drop-zone element has a position: relative property which can interfere with drag-and-drop functionality. A solution to this issue is detailed in this guide found here. Moreover, it becomes apparent that during dragging, the mouseover event does not propagate across the .drag element, necessitating that the .drop-zone-edge elements have a higher z-index for proper display order. You can test the implementation here. Extend this technique to handle top, left, and right edges, while ensuring transparency for the .drop-zone-edge elements.

HTML Structure:

<div class="drop-zone">
    <div class="drop-zone-edge drop-zone-top"></div>
    <div class="drop-zone-edge drop-zone-bottom"></div>
</div>

CSS Styling:

.drag {
  z-index: 100;
}

.drop-zone-edge {
    width: 100%;
    height: 10px;
    background-color: red;
    position: absolute;    
    z-index: 200;
}

.drop-zone-top {
    top: 0;
}

.drop-zone-bottom {
    bottom: 0;
}

JavaScript Functionality:

var isClicked = false;

$(document).mousedown(function() {
    isClicked = true;
})
.mouseup(function() {
    isClicked = false;
});

$('.drop-zone').droppable({
    accept: '.drag',
    drop: function(event, ui) {
        var $clone = ui.helper.clone();
        if (!$clone.is('.inside-drop-zone')) {
            $(this).append($clone.addClass('inside-drop-zone').draggable({
                 containment: '.drop-zone'
            }));
        }
        var parent = $('.drop-zone');
        var leftAdjust = $clone.position().left - parent.offset().left;
        var topAdjust = $clone.position().top - parent.offset().top;
        $clone.css({left: leftAdjust, top: topAdjust});
    }
});

$('.drag').draggable({
    helper: 'clone'
});

var shouldEnlargedBottom = false;
$('.drop-zone-bottom').on('mouseover', function(e) {
    if(isClicked) {
        shouldEnlargedBottom = true;
    }
});

$('.drop-zone-bottom').on('mouseout', function(e) {
    shouldEnlargedBottom = false;
});

function enlargeArea() {
    if(shouldEnlargeBottom) {
        var newHeight = $('.drop-zone').height() + 3;
        $('.drop-zone').height(newHeight);
    }
}

setInterval(enlargeArea, 100);

Enable the expansion of a div by dragging and dropping an image onto it

Answer №1

Similar questions

Changing a variable within a method does not automatically reflect in the child component

Angular JS Unveiled: Deciphering HTML Entities

Storing the returned JSON response from Jquery into a variable

Exploring the best practices for organizing logic within Node.js Express routes

Making an Ajax Request with Several Parameters

The submission of the form is not possible with jQuery

Cursor hovers over button, positioned perfectly in the center

Exploring the World of MVC 4: Delving into Modal Windows, Partial Views,

Visual feedback: screen flashes upon clicking to add a class with jQuery

The flashing of Bootstrap tabs can be seen on various pages

Create a function that adds a new div element with a one-of-a-kind identification when

What could be causing the entire app to malfunction when the Redux Provider tag is used

Utilizing data from a JavaScript array and merging it with basic HTML structure

Are there any debugging tools specific to Internet Explorer for JavaScript?

Printing a React component using a button causes formatting related to className to be lost, while printing it inline preserves the formatting

Extract the content of a textbox within an iframe located in the parent window

Every time I click a button, I am trying to add JSON objects into an array and then show the outcomes

Show a 1920x1170 / 183KB image as the background using CSS styling

Unable to load the type [ProjectName].WebAPIApplication in the Web API application

Position the Bootstrap button on the right side