javascript - Animate the drawing of a dashed svg line -


i'm trying animate arrow dashed line, ------->, horizontal , vertical path, using svg , css animations.

i've tried couple of different things, animating height , width, using bottom , top, each way has had doesn't quite or work well.

i managed path drawn svg, animation remove dashes , draw solid line.

no animation: http://jsfiddle.net/ehan4/2/

<svg version="1.1" id="layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="252px" height="396px" viewbox="0 0 252 396" enable-background="new 0 0 252 396" xml:space="preserve"> <path stroke="#000" stroke-width="1.5" fill="none" d="m50.887,170.063v-53.488h55.814" stroke-dasharray="5,5" stroke-dashoffset="0.00" />

with animation: http://jsfiddle.net/ehan4/1/

<svg version="1.1" id="layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="252px" height="396px" viewbox="0 0 252 396" enable-background="new 0 0 252 396" xml:space="preserve"> <path stroke="#000" stroke-width="1.5" fill="none" d="m50.887,170.063v-53.488h55.814" stroke-dasharray="5,5" stroke-dashoffset="0.00" /> 

var path = document.queryselector('path'); var length = path.gettotallength();  path.style.transition = path.style.webkittransition = 'none'; path.style.strokedasharray = length + ' ' + length; path.style.strokedashoffset = length; path.getboundingclientrect();  path.style.transition = path.style.webkittransition = 'stroke-dashoffset 2s ease-in-out'; path.style.strokedashoffset = '0';

any thoughts or ideas appreciated!

z

this function can animate drawing of dashed path:

function drawpath(path, options) {     options = options || {}     var duration = options.duration || 5000     var easing = options.easing || 'ease-in-out'     var reverse = options.reverse || false     var undraw = options.undraw || false     var callback = options.callback || function () {}      var length = path.gettotallength()     var dashoffsetstates = [length, 0]     if (reverse) {         dashoffsetstates = [length, 2 * length]     }     if (undraw) {         dashoffsetstates.reverse()     }      // clear previous transition     path.style.transition = path.style.webkittransition = 'none';      var dasharray = path.style.strokedasharray || path.getattribute("stroke-dasharray");      if (dasharray != '') {         // dashed path case         // repeats dash pattern many times needed cover path length         var dashlength = dasharray.split(/[\s,]/).map(function (a) {             return parsefloat(a) || 0         }).reduce(function (a, b) {             return + b         })         var dashcount = length / dashlength + 1         var = new array(math.ceil(dashcount)).join(dasharray + " ")         path.style.strokedasharray = + '0' + ' ' + length     } else {         // non dashed path case         path.style.strokedasharray = length + ' ' + length;     }     path.style.strokedashoffset = dashoffsetstates[0];     path.getboundingclientrect();     path.style.transition = path.style.webkittransition =         'stroke-dashoffset ' + duration + 'ms ' + easing;     path.style.strokedashoffset = dashoffsetstates[1]     settimeout(function() {         path.style.strokedasharray = dasharray //set original dash array         callback()     }, duration) }

it repeats dash pattern many times needed cover path length , adds empty dash length of path. animates dash offset, in example.

working demo: http://jsfiddle.net/u88bm18b/


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