How do I select multiple SVG elements using the right mouse button and the CRTL key?
What I would like is similar to this example I found (the part on the right). It is possible to select only one element or, by holding down the CTRL key, several elements.
I looked at the code and I can't reproduce it in my case.
My case: JSFIDDLE
I have more circles I wish I could select. I would like that when the user selects a circle, the id
of the chosen circle is printed. When the user has finished selecting what he wants, and he presses the Finish
button, then I would like the list of selected items to be printed.
Can this be done? Any assistance is greatly appreciated.
I changed the code of @Shashank, now it works. I hope it can be useful to someone :)
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="https://code.jquery.com/jquery-3.2.1.js"></script>
<script src="https://d3js.org/d3.v4.min.js" charset="utf-8"></script>
<link rel="stylesheet" type="text/css" href="style.css" media="screen"/>
</head>
<body>
<div id="circles">
<svg>
<circle id="first" cx="10" cy="10" r="10" fill="purple" />
<circle id="second" cx="60" cy="60" r="5" fill="red" />
<circle id="third" cx="110" cy="110" r="15" fill="orange" />
<circle id="fourth" cx="90" cy="50" r="7" fill="yellow" />
</svg>
</div>
<button type="button" id="finalSelection">Finish</button>
<span style="display:block;margin-top: 10px;">Selected IDs: <span class="values"></span></span>
<script src="script.js"></script>
</body>
</html>
script.js
var selectedIds = [];
d3.selectAll('#circles svg circle').on('click', function() {
// fetch ID
var id = d3.select(this).attr('id');
// toggle "clicked" class and push/splice id within the selectedIds array accordingly based on event.metaKey (CTRL)
if(d3.select(this).classed('clicked')) { // classed add/remove a CSS class from the selection
d3.select(this).classed('clicked', false).style('stroke', null);
selectedIds.splice(selectedIds.indexOf(id), 1); // the splice() method adds/removes items to/from an array, and returns the removed item(s)
}
else { // if an item has never been selected
if(selectedIds.length) { // if the array selectedIds is not empty
if(d3.event.ctrlKey) { // if CTRL is pressed
d3.select(this).classed('clicked', true).style('stroke', 'blue');
selectedIds.push(id);
}
else { // *** OK *** if the item I'm selecting has never been selected and before I had already selected other elements
// I "remove" all those already selected
d3.selectAll(".clicked").classed('clicked', false).style('stroke', null);
selectedIds = [];
// I consider selected the one actually selected
d3.select(this).classed('clicked', true).style('stroke', 'blue');
selectedIds.push(id);
}
}
else { // if the array selectedIds is empty
d3.select(this).classed('clicked', true).style('stroke', 'blue');
selectedIds.push(id);
}
}
$('span.values').html(selectedIds.join(', '));
});
$('button#finalSelection').click(function() {
$('span.values').html(selectedIds.join(', '));
console.log("compare!")
});
style.css
span.values {
color: #428bca;
}
JSFIDDLE with the updated code.
Yes sure it can done. Are you sure it should be a right mouse button click and CTRL?
Here's a snippet doing that:
var selectedIds = []; d3.selectAll('#circles svg circle').on('contextmenu', function() { // prevent default right click functionality d3.event.preventDefault(); // fetch ID var id = d3.select(this).attr('id'); // toggle "clicked" class and push/splice id within the selectedIds array accordingly based on event.ctrlKey (CTRL) if(d3.select(this).classed('clicked')) { if(selectedIds.length > 1) { if(d3.event.ctrlKey) { d3.select(this).classed('clicked', false).style('stroke', null); selectedIds.splice(selectedIds.indexOf(id), 1); } } else { d3.select(this).classed('clicked', false).style('stroke', null); selectedIds.splice(selectedIds.indexOf(id), 1); } } else { if(selectedIds.length) { if(d3.event.ctrlKey) { d3.select(this).classed('clicked', true).style('stroke', '#000'); selectedIds.push(id); } } else { d3.select(this).classed('clicked', true).style('stroke', '#000'); selectedIds.push(id); } } $('span.values').html(selectedIds.join(', ')); }); $('button#finalSelection').click(function() { $('span.values').html(selectedIds.join(', ')); });
span.values { color: #428bca; }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <script src="https://code.jquery.com/jquery-3.2.1.js"></script> <script src="https://d3js.org/d3.v4.min.js" charset="utf-8"></script> </head> <body> <div id="circles"> <svg> <circle id="first" cx="10" cy="10" r="10" fill="purple" /> <circle id="second" cx="60" cy="60" r="5" fill="red" /> <circle id="third" cx="110" cy="110" r="15" fill="orange" /> <circle id="fourth" cx="90" cy="50" r="7" fill="yellow" /> </svg> </div> <button type="button" id="finalSelection">Finish</button> <span style="display:block;margin-top: 10px;">Selected IDs: <span class="values"></span></span> </body> </html>
I've added comments within the snippet but let me tell you how it works:
d3.select().on('contextmenu', function())
for mouse right click event listeners. preventDefault()
has to be called to prevent the default functionality of a mouse right button click ie hide the default contextmenu. selectedIds
is an array that keeps a track of clicked IDs. d3.event.ctrlKey
is the key here -- which checks for CTRL press. Also, just in case you change your mind to make it a left mouse click + CTRL , change the contextmenu
to click
and take out the call to preventDefault()
.
Let me know if you have any questions. Hope this helps :)
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