Галерея 3096470

Галерея 3096470

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Asked
12 years, 8 months ago

Modified
1 year, 8 months ago

28.6k 25 25 gold badges 97 97 silver badges 157 157 bronze badges

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//init
let r = document.getElementById('r'),
p = document.getElementById('p'),
signaturePath = '',
isDown = false,
svg = document.getElementById('sig_panel'),
b_show = document.getElementById('show'),
b_clear = document.getElementById('clear'),
pathdata = document.getElementById('pathdata');

//drawing functions
function isTouchEvent(e) {
return e.type.match(/^touch/);
}

function getCoords(e) {
if (isTouchEvent(e)) {
return e.targetTouches[0].clientX + ',' + e.targetTouches[0].clientY;
}
return e.clientX + ',' + e.clientY;
}

function down(e) {
signaturePath += 'M' + getCoords(e) + ' ';
p.setAttribute('d', signaturePath);
isDown = true;

if (isTouchEvent(e)) e.preventDefault();
}

function move(e) {
if (isDown) {
signaturePath += 'L' + getCoords(e) + ' ';
p.setAttribute('d', signaturePath);
}

if (isTouchEvent(e)) e.preventDefault();
}

function up(e) {
isDown = false;

if (isTouchEvent(e)) e.preventDefault();
}

//input handlers
r.addEventListener('touchstart', down, false);
r.addEventListener('touchmove', move, false);
r.addEventListener('touchend', up, false);
r.addEventListener('mousedown', down, false);
r.addEventListener('mousemove', move, false);
r.addEventListener('mouseup', up, false);
r.addEventListener('mouseout', up, false);

//helper functions
function clearSignature() {
pathdata.textContent = '';
signaturePath = '';
p.setAttribute('d', '');
}

function getSignature() {
pathdata.textContent = signaturePath;
return signaturePath;
}

//button handlers
b_show.addEventListener('click', getSignature);
b_clear.addEventListener('click', clearSignature);
svg {
margin: .5em;
border: 1px solid gray;
border-radius: .5em;
}

.flex {
display: flex;
}

button {
margin: .5em;
}

#pathdata {
font-family: monospace;
background: #ddd;
padding: 1em;
margin: 1em .5em;
}

Show signaure path data

Clear signature

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Highly active question . Earn 10 reputation (not counting the association bonus ) in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.

Not the answer you're looking for? Browse other questions tagged ipad html canvas svg or ask your own question .

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Anyone know how this can be done? Would you use a canvas object, svg, jQuery, etc?
Here's another canvas based version with variable width (based on drawing velocity) curves: demo at http://szimek.github.io/signature_pad and code at https://github.com/szimek/signature_pad .
A canvas element with some JavaScript would work great.
In fact, Signature Pad (a jQuery plugin) already has this implemented.
Here is a quickly hacked up version of this using SVG I just did. Works well for me on my iPhone. Also works in a desktop browser using normal mouse events.
Perhaps the best two browser techs for this are Canvas, with Flash as a back up.
We tried VML on IE as backup for Canvas, but it was much slower than Flash. SVG was slower then all the rest.
With jSignature ( http://willowsystems.github.com/jSignature/ ) we used Canvas as primary, with fallback to Flash-based Canvas emulator (FlashCanvas) for IE8 and less. Id' say worked very well for us.
@szimek (selected answer) has a well-documented solution for those who want a full-featured module with a MIT license that's good-to-go. @heycam has a simpler solution that requires no libraries or plugins, has no licenses, and can be easily customized; all of which makes it a better fit for my needs. This post tries to explain how exactly his solution works.
Here's @heycam's solution as a runnable snippet:
Saving the path.d value on the server (and client cache) is all I need. Others may need to save the entire svg itself with path.d filled in, or convert it to other formats (JPEG, PNG, PDF) using appropriate converters (not covered here).
I plan to go a step beyond and add user controls to manage the following:
and theme the signature field (as part of my custom form lib):
Another OpenSource signature field is https://github.com/applicius/jquery.signfield/ , registered jQuery plugin using Sketch.js .
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