I have used jsplumb for dragging an element from one div and drop it to another div. It is working fine. Here's my code:
var counter = 0;
var x = null;
//Make element draggable
$(".drag").draggable({
helper: 'clone',
cursor: 'move',
tolerance: 'fit',
revert: true
});
$(".droppable").droppable({
accept: '.drag',
activeClass: "drop-area",
drop: function(e, ui) {
if ($(ui.draggable)[0].id !== "") {
x = ui.helper.clone();
<!-- ui.helper.remove(); -->
x.draggable({
helper: 'original',
cursor: 'move',
containment: '.droppable',
tolerance: 'fit',
drop: function(event, ui) {
$(ui.draggable).remove();
}
});
I have created another example where I am creating four blocks and making them connect by linking them dynamically using jsplumb. Similar kind of working example is in the link https://jsplumbtoolkit.com/community/demo/flowchart/index.html
Now I want to integrate both these. I want to drag and drop and dynamically create links, anchors, and endpoints between them. How to do that?
Related
How can I drop items (like image, or other object from other canvas) into canvas which is managed by fabricjs? I have found many examples how to move items inside canvas but I would like to drag and drop item from outer element into canvas.
Since you asked for an example and I haven't tried it out myself yet, here goes:
Example Fiddle
Markup
<div id="images">
<img draggable="true" src="http://i.imgur.com/8rmMZI3.jpg" width="250" height="250"></img>
<img draggable="true" src="http://i.imgur.com/q9aLMza.png" width="252" height="295"></img>
<img draggable="true" src="http://i.imgur.com/wMU4SFn.jpg" width="238" height="319"></img>
</div>
<div id="canvas-container">
<canvas id="canvas" width="800" height="600"></canvas>
</div>
JS Breakdown
1. Fabric.canvas instance
First we want our canvas, of course:
var canvas = new fabric.Canvas('c');
2. Feature Detection (optional)
Not sure this is necessary, since the fact that you have a canvas makes it very likely that the browser has Drag and Drop as well. Were you to use it, you can do so like this, using Modernizr:
if (Modernizr.draganddrop) {
// Browser supports HTML5 DnD.
// Bind the event listeners for the image elements
// Bind the event listeners for the canvas
} else {
// Replace with a fallback to a library solution.
alert("This browser doesn't support the HTML5 Drag and Drop API.");
}
3. Events
Again, unlike the source article I below, the source and target elements are different (in that articles's example, you just move divs around within the same parent container), so I failed to notice that some of the events are meant for the element being dragged, but most are bound to the element into which you are dropping.
NOTE: I know this is technically a question about Fabric.js, but it's really kind of a question about Drag and Drop in the context of adding objects to a <canvas> with Fabric.js, which is why I'm going a bit more in depth about the DnD stuff now.
For the <img>
dragstart (I added a class here to lower the opacity)
dragend (and removed that class here)
For #canvas-container:
dragenter (added a class to give the canvas container that nifty dotted line)
dragover: Here you can set the event.dataTransfer.dropEffect property to show one of the native cursor types. The default would be 'move' here, but I set it to 'copy' since I don't actually remove the <img> element (in fact in the fiddle you can, for example create several McClures).
dragleave (removed the dotted line here)
drop: The handler for this event creates and adds the fabric.Image object (see the fiddle).
if (Modernizr.draganddrop) {
// Browser supports HTML5 DnD.
// Bind the event listeners for the image elements
var images = document.querySelectorAll('#images img');
[].forEach.call(images, function (img) {
img.addEventListener('dragstart', handleDragStart, false);
img.addEventListener('dragend', handleDragEnd, false);
});
// Bind the event listeners for the canvas
var canvasContainer = document.getElementById('canvas-container');
canvasContainer.addEventListener('dragenter', handleDragEnter, false);
canvasContainer.addEventListener('dragover', handleDragOver, false);
canvasContainer.addEventListener('dragleave', handleDragLeave, false);
canvasContainer.addEventListener('drop', handleDrop, false);
} else {
// Replace with a fallback to a library solution.
alert("This browser doesn't support the HTML5 Drag and Drop API.");
}
Sources:
HTML5 Rocks - Native HTML5 Drag and Drop
Modernizr
Web Platform Docs > DOM > Properties - dropEffect
Web Platform Docs > DOM > Events
dragstart
dragend
dragenter
dragover
dragleave
drop
I had gone through fiddle of #natchiketa, And fixed the problem , just check this fiddle..
http://jsfiddle.net/Ahammadalipk/w8kkc/185/
window.onload = function () {
var canvas = new fabric.Canvas('canvas');
/*
NOTE: the start and end handlers are events for the <img> elements; the rest are bound to
the canvas container.
*/
function handleDragStart(e) {
[].forEach.call(images, function (img) {
img.classList.remove('img_dragging');
});
this.classList.add('img_dragging');
}
function handleDragOver(e) {
if (e.preventDefault) {
e.preventDefault();
}
e.dataTransfer.dropEffect = 'copy';
return false;
}
function handleDragEnter(e) {
this.classList.add('over');
}
function handleDragLeave(e) {
this.classList.remove('over');
}
function handleDrop(e) {
if (e.stopPropagation) {
e.stopPropagation(); // stops the browser from redirecting.
}
var img = document.querySelector('#images img.img_dragging');
var newImage = new fabric.Image(img, {
width: img.width,
height: img.height,
// Set the center of the new object based on the event coordinates relative
// to the canvas container.
left: e.layerX,
top: e.layerY
});
newImage.hasControls = newImage.hasBorders = false;
canvas.add(newImage);
return false;
}
function handleDragEnd(e) {
// this/e.target is the source node.
[].forEach.call(images, function (img) {
img.classList.remove('img_dragging');
});
}
if (Modernizr.draganddrop) {
var images = document.querySelectorAll('#images img');
[].forEach.call(images, function (img) {
img.addEventListener('dragstart', handleDragStart, false);
img.addEventListener('dragend', handleDragEnd, false);
});
var canvasContainer = document.getElementById("canvas-container");
canvasContainer.addEventListener('dragenter', handleDragEnter, false);
canvasContainer.addEventListener('dragover', handleDragOver, false);
canvasContainer.addEventListener('dragleave', handleDragLeave, false);
canvasContainer.addEventListener('drop', handleDrop, false);
} else {
alert("This browser doesn't support the HTML5 Drag and Drop API.");
}
}
Thanks
Well, the question is quite old^^
I have updateted the fiddle, no it will work in Firefox as well.
Fiddle
function handleDrop(e) {
// this / e.target is current target element.
e.preventDefault(); //I've altert this line for FireFox
As far as I understand, drag and drop is not already provided by fabricjs,
fiddling it will be quite interesting.
Well I m new to javascript and fabricJS but I think this fiddle might help
fiddle
html code
<div class="img_cont">
<img class="img" id="ele1" draggable="true" ondragstart="dragElement(event)" src="https://webkit.org/wp-content/uploads/STP-300x300.png">
<img class="img" id="ele2" draggable="true" ondragstart="dragElement(event)" src="https://webkit.org/wp-content/uploads/ephy-webkit-graphic.png">
<img class="img" id="ele3" draggable="true" ondragstart="dragElement(event)" src="https://res.cloudinary.com/css-tricks/image/upload/w_600,q_auto,f_auto/buysellads/uu/7/112766/1646327381-MC_CSSTricks_Logo_600x600-_1_.png">
<img class="img" id="ele4" draggable="true" ondragstart="dragElement(event)" src="https://miro.medium.com/max/1400/1*9hd_8qR0CMZ8L0pVbFLjDw.png">
</div>
<br>
<div id="canvas_cont" ondragover="allowDrop(event)" ondrop="dropElement(event)">
<canvas id="canvas" width="650" height="350" ></canvas>
</div>
javascript code
// allowDrop function called on ondragover event.
function allowDrop(e) {
e.preventDefault();
}
//dragElement function called on ondrag event.
function dragElement(e) {
e.dataTransfer.setData("id", e.target.id); //transfer the "data" i.e. id of the target dragged.
}
//Initializing fabric canvas on window load event.
var canvas;
window.onload = function(){
canvas = new fabric.Canvas(document.getElementById("canvas"));
}
//dropElement function called on ondrop event.
function dropElement(e) {
e.preventDefault();
var data = e.dataTransfer.getData("id"); //receiving the "data" i.e. id of the target dropped.
var imag = document.getElementById(data); //getting the target image info through its id.
var img = new fabric.Image(imag, { //initializing the fabric image.
left: e.layerX - 80, //positioning the target on exact position of mouse event drop through event.layerX,Y.
top: e.layerY - 40,
});
img.scaleToWidth(imag.width); //scaling the image height and width with target height and width, scaleToWidth, scaleToHeight fabric inbuilt function.
img.scaleToHeight(imag.height);
canvas.add(img);
}
The accepted answer no longer works.
This is for drag and drop from desktop using the dataTransfer interface.
canvas.on('drop', function(event) {
// prevent the file to open in new tab
event.e.stopPropagation();
event.e.stopImmediatePropagation();
event.e.preventDefault();
// Use DataTransfer interface to access the file(s)
if(event.e.dataTransfer.files.length > 0){
var files = event.e.dataTransfer.files;
for (var i = 0, f; f = files[i]; i++) {
// Only process image files.
if (f.type.match('image.*')) {
// Read the File objects in this FileList.
var reader = new FileReader();
// listener for the onload event
reader.onload = function(evt) {
// put image on canvas
fabric.Image.fromURL(evt.target.result, function(obj) {
obj.scaleToHeight(canvas.height);
obj.set('strokeWidth',0);
canvas.add(obj);
});
};
// Read in the image file as a data URL.
reader.readAsDataURL(f);
}
}
}
});
Resources
https://developer.mozilla.org/en-US/docs/Web/API/HTML_Drag_and_Drop_API/File_drag_and_drop
From http://codemirror.net/doc/manual.html, I only find getRange(),
undo(), redo() etc, and I can't find cut(), copy() and paste API,
and more when I try to run editor.execCommand("cut"), I get the error.
Could you help me? Thanks!
Using clipboard.js, you can define the text() function to grab the value of the CodeMirror's inner document.
Store a reference to the (<textarea>) editor's selector for convenience.
var editorSelector = '#editor' // or '#editor + .CodeMirror';
Instantiate a new ClipBoard object with reference to your button.
new Clipboard('.clip-btn-native', {
text: function(trigger) {
return getCodeMirrorNative(editorSelector).getDoc().getValue();
}
});
Retrieve a CodeMirror Instance via native JavaScript.
function getCodeMirrorNative(target) {
var _target = target;
if (typeof _target === 'string') {
_target = document.querySelector(_target);
}
if (_target === null || !_target.tagName === undefined) {
throw new Error('Element does not reference a CodeMirror instance.');
}
if (_target.className.indexOf('CodeMirror') > -1) {
return _target.CodeMirror;
}
if (_target.tagName === 'TEXTAREA') {
return _target.nextSibling.CodeMirror;
}
return null;
};
Demo
Please see complete; in-depth demo over at JSFiddle.
There are no CodeMirror APIs for cut/copy/paste because browser security restrictions forbid JavaScript from accessing the clipboard programmatically. Paste could be used to steal private data and Cut/Copy can be used as a more elaborate attack vector.
The browser's own native code handles user gestures that access the clipboard (keyboard shortcuts and context menu items), based solely on the currently selected text or focused text field.
This SO thread has a good summary of attempts to work around these restrictions. CodeMirror's approach is the first bullet: it uses a hidden textarea to ensure that user clipboard gestures work, but that still doesn't support programmatic APIs.
But there is a partial workaround: use a small Flash widget (this is the 2nd bullet in the thread above). Flash relaxes the restrictions on Copy/Cut (but not Paste) a bit. It still has to be triggered by some user event, but it could be something like clicking a button in your HTML UI. Wrappers like ZeroClipboard and Clippy make it simple to access to these capabilities without needing to know Flash. You'd need to write a little glue code to pull the appropriate string from CodeMirror when copying, but it shouldn't be too bad.
Add a hidden contenteditable div to your textarea editor wrapper. Contenteditable divs respect new lines and tabs, which we need when copying code.
Here is my CodePen demo
var content = $('.content');
var toCopy = content.find('.copy-this');
// initialize the editor
var editorOptions = {
autoRefresh: true,
firstLineNumber: 1,
lineNumbers: true,
smartIndent: true,
lineWrapping: true,
indentWithTabs: true,
refresh: true,
mode: 'javascript'
};
var editor = CodeMirror.fromTextArea(content.find(".editor")[0], editorOptions);
content[0].editor = editor;
editor.save();
// set editors value from the textarea
var text = content.find('.editor').text();
editor.setValue(text);
// setting with editor.getValue() so that it respects \n and \t
toCopy.text(editor.getValue());
$(document).on('click', '.copy-code', function() {
var content = $(this).closest('.content');
var editor = content[0].editor;
var toCopy = content.find('.copy-this')[0];
var innerText = toCopy.innerText // using innerText here because it preserves newlines
// write the text to the clipboard
navigator.clipboard.writeText(innerText);
});
.content {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
.CodeMirror {
height: fit-content !important;
}
.copy-code {
background: #339af0;
width: fit-content;
cursor: pointer;
}
<!-- resources -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.35.0/codemirror.css" />
<script src="https://codemirror.net/lib/codemirror.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.40.0/mode/javascript/javascript.min.js"></script>
<script src=""></script>
<script src=""></script>
<script src=""></script>
<script src=""></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="content">
<!-- button to copy the editor -->
<div class="copy-code" title="copy code">copy</div>
<!-- add contenteditable div as it respects new lines when copying unlike textarea -->
<div class="copy-this" contenteditable style="display: none"></div>
<textarea class="editor" style="display: none;">// here is a comment
// here is another comment
</textarea>
</div>
I have a static html form layout where i add extjs form fields using the "renderTo" config. In order to have form validation and simple submit methods i want to add the fields to a form panel. As the layout is managed by the html frame i don't want the form to be rendered by the panel (panel has html frame as contentEl and this should be used as is).
In extjs3 i could achieve this by adding the field not to the panel but to the BasicForm (formpanel.getForm().add(...)) but in extjs4 this method seems to be gone.
How can i do this using extjs4?
Thanks in advance.
Since you already have a Panel that uses the contentEl to render HTML into its body, I recommend to stick with this approach:
Replace the panel with an Ext.form.Panel instance - the configuration, particularly the contentEl config - can remain unchanged.
The code provided here will override a standard Ext class (Ext.layout.Layout) and introduce support for a 'renderItemTo' config property on child items of any Ext container or panel instance (including Ext.form.Panel).
The value of the config property should be the ID of an already rendered DOM node, e.g. a DIV element that is part of the HTML fragment used in as the contentEl of the parent container's body.
Ext.require(['Ext.layout.Layout'], function() {
Ext.override(Ext.layout.Layout, {
renderItem: function (item, target, position) {
if(item.renderItemTo) {
// render 'renderItemTo' components into the specified DOM element
item.render(item.renderItemTo, 1);
// don't allow container layout to seize the component
item.layoutManagedHeight = 2;
item.layoutManagedWidth = 2;
} else {
// just use standard Ext code for non-renderItemTo components
this.callOverridden(arguments);
}
},
isValidParent: function(item, target, position) {
// signal Ext that we are OK with were our 'renderItemTo' component is right now
// otherwise it would get moved during the layout process
return item.renderItemTo ? true : this.callOverridden(arguments);
}
});
});
Usage:
var panel = Ext.create('Ext.form.Panel', {
contentEl: 'form', // the DOM element ID that holds the HTML fragment for the body
title: 'My FormPanel with special FX',
items: [
{
xtype: 'textfield',
renderItemTo: 'text1', // the ID of a DOM element inside the HTML fragment
fieldLabel: 'Label 1',
},
{
xtype: 'textfield',
renderItemTo: 'text2', // the ID of a DOM element inside the HTML fragment
fieldLabel: 'Label 2'
}
]
});
I uploaded a working example to JSFiddle (note: resize the window if you experience a render problem - this is related to JSFiddle, not my override).
After digging through the layout system of ExtJS 4.1 i implemented a custom layout which moves the items after rendering to the desired position in the fixed markup. The result is the same as for the ExtJS 4.0.7 version from this thread. It seams to work for the ExtJS standard fields. I have some problems with my custom fields though.
Ext.define('Ext.ux.layout.Fixed', {
extend: 'Ext.layout.container.Auto',
alias: 'layout.uxfixed',
afterRenderItem: function(item) {
// move items with renderToFixedMarkup to desired position
if (item.renderToFixedMarkup) {
var target = Ext.getDom(item.renderToFixedMarkup);
this.moveItem(item, target);
}
},
isValidParent: function(item, target, position) {
// items with renderToFixedMarkup property are always positioned correctly
return (item.renderToFixedMarkup) ? true : this.callOverridden(arguments);
}
});
It can be used by setting "layout: 'uxfixed'" on the panel and the "renderToFixedMarkup" config on the items.
did somebody manage to sort multiple items at once with jquery.ui.sortable?
we are working on a photo managing app.
select multiple items
drag them to a new location.
thanx
I had a similar requirement, but the solution in the accepted answer has a bug. It says something like "insertBefore of null", because it removes the nodes.
And also i tried jQuery multisortable, it stacks the selected items on top of each other when dragging, which is not what i want.
So I rolled out my own implementation and hope it will save others some time.
Fiddle Link.
Source code:
$( "#sortable" ).sortable({
// force the cursor position, or the offset might be wrong
cursorAt: {
left: 50,
top: 45
},
helper: function (event, item) {
// make sure at least one item is selected.
if (!item.hasClass("ui-state-active")) {
item.addClass("ui-state-active").siblings().removeClass("ui-state-active");
}
var $helper = $("<li><ul></ul></li>");
var $selected = item.parent().children(".ui-state-active");
var $cloned = $selected.clone();
$helper.find("ul").append($cloned);
// hide it, don't remove!
$selected.hide();
// save the selected items
item.data("multi-sortable", $cloned);
return $helper;
},
stop: function (event, ui) {
// add the cloned ones
var $cloned = ui.item.data("multi-sortable");
ui.item.removeData("multi-sortable");
// append it
ui.item.after($cloned);
// remove the hidden ones
ui.item.siblings(":hidden").remove();
// remove self, it's duplicated
ui.item.remove();
}
});
There's a jQuery UI plugin for that: https://github.com/shvetsgroup/jquery.multisortable
jsFiddle: http://jsfiddle.net/neochief/KWeMM/
$('ul.sortable').multisortable();
... or just define a 'items' option to your multisortable that way (for example) :
$('table tbody').multisortable({
items: 'tr'
});
you can use shvetsgroup/jquery.multisortable
but it will create problem.. because, that js is designed only for tags...
but customize it to use it, its very simple i'll tell you how????
at first download that .js and use it in your program...
step 1. open the js file...now edit the following lines...
$.fn.multiselectable.defaults = {
click: function(event, elem) {},
mousedown: function(event, elem) {},
selectedClass: 'selected',
items: 'li'
};
the above are lines from 107 to 112....
there you can see "items: 'li'
in that use your tag which you are used to enclose those image like if you are using, or or anything you are using like this
$.fn.multiselectable.defaults = {
click: function(event, elem) {},
mousedown: function(event, elem) {},
selectedClass: 'selected',
items: 'div' // or any tag you want...
};
and 249 to 254
selectedClass: 'selected',
placeholder: 'placeholder',
items: 'li'
};
}(jQuery);
change the line " item:'li' " with your tag like this
selectedClass: 'selected',
placeholder: 'placeholder',
items: 'div' // or anything else
};
}(jQuery);
if you are working on textboxes inside those envelopes.. you have to get rid of these lines too
// If no previous selection found, start selecting from first selected item.
prev = prev.length ? prev : $(parent.find('.' + options.selectedClass)[0]).addClass('multiselectable-previous');
var prevIndex = prev.index();
after that comment line...
add a line code that search textbox or check box or any interaction element inside it...
like this..
// If no previous selection found, start selecting from first selected item.
item.children("input").focus(); // customize this code to get your element focus...
prev = prev.length ? prev : $(parent.find('.' + options.selectedClass)[0]).addClass('multiselectable-previous');
var prevIndex = prev.index();
and also to indicate selected tags or elements... use styles like this
div { margin: 2px 0; cursor: pointer; }
div.selected { background-color: orange }
div.child { margin-left: 20px; }
actually i used div.. instead of that you can use any tag you wish...
hope will help u.... if it is not... read again.. and ask again....
wishes
I am trying to implement a drag and drop senario from an extJs TreePanel into a div in the body of the page. I have been following an example by Saki here.
So far I have the below code:
var contentAreas = new Array();
var tree = new Ext.tree.TreePanel({
title : 'Widgets',
useArrows: true,
autoScroll: true,
animate: true,
enableDrag: true,
border: false,
layout:'fit',
ddGroup:'t2div',
loader:new Ext.tree.TreeLoader(),
root:new Ext.tree.AsyncTreeNode({
expanded:true,
leaf:false,
text:'Tree Root',
children:children
}),
listeners:{
startdrag:function() {
$('.content-area').css("outline", "5px solid #FFE767");
},
enddrag:function() {
$('.content-area').css("outline", "0");
}
}
});
var areaDivs = Ext.select('.content-area', true);
Ext.each(areaDivs, function(el) {
var dd = new Ext.dd.DropTarget(el, {
ddGroup:'t2div',
notifyDrop:function(ddt, e, node) {
alert('Drop');
return true;
}
});
contentAreas[contentAreas.length] = dd;
});
The drag begins and the div highlights but when I get over the div it does not show as a valid drop target and the drop fails.
This is my first foray into extJS. I'm JQuery through and through and I am struggling at the moment.
Any help would be appreciated.
Ian
Edit
Furthermore if I create a panel with a drop target in it, this works fine. What is the difference between creating an element and selecting an existing element from the dom. This is obviously where I am going wrong but I'm none the wiser. I have to be able to select existing dom elements and make them into drop targets so the code below is not an option.
Here is the drop target that works
var target = new Ext.Panel({
renderTo: document.body
,layout:'fit'
,id:'target'
,bodyStyle:'font-size:13px'
,title:'Drop Target'
,html:'<div class="drop-target" '
+'style="border:1px silver solid;margin:20px;padding:8px;height:140px">'
+'Drop a node here. I\'m the DropTarget.</div>'
// setup drop target after we're rendered
,afterRender:function() {
Ext.Panel.prototype.afterRender.apply(this, arguments);
this.dropTarget = this.body.child('div.drop-target');
var dd = new Ext.dd.DropTarget(this.dropTarget, {
// must be same as for tree
ddGroup:'t2div'
// what to do when user drops a node here
,notifyDrop:function(dd, e, node) {
alert('drop');
return true;
} // eo function notifyDrop
});
}
});
See if adding true as the second param here makes any difference:
var areaDivs = Ext.select('.content-area', true);
As a cosmetic note, the param name e conventionally indicates an event object (as in the second arg of notifyDrop). For an element, el is more typical. Doesn't matter functionally, but looks weird to someone used to Ext code to see e passed into the DropTarget constructor.
If you are having problem duplicating a working example such as that, copy the entire thing, then modify it to your needs line-by-line - you can't go wrong.
As i know you can't set DropZone to any Ext element, just to Ext component. So this might be you problem. Try to use DropTarget instead of DropZone.