问题
ASAIK jquery animate function accepts style properties only. but i want to animate the attributes of an element. consider a SVG element rectangle
<svg>
<rect id="rect1" x=10 y=20 width="100px" height="100px">
</svg>
i want to animate the rectangle element attribute "x" and "y" something like below
$("#rect1").animate({
x: 30,
y: 40
}, 1500 );
but it is not correct way because animate function affects style not attribute of an element.
i knew so many custom plugin is there like raphel.js.
http://raphaeljs.com/
but i don't want to use custom plugin to do this. i want to do this simply in jquery.animate function.
is this possible ?
Thanks,
Siva
回答1:
just animate the old fashioned way:
you can call animate
in a jquery like fashion.
http://jsfiddle.net/wVv9P/7/
function animate($el, attrs, speed) {
// duration in ms
speed = speed || 400;
var start = {}, // object to store initial state of attributes
timeout = 20, // interval between rendering loop in ms
steps = Math.floor(speed/timeout), // number of cycles required
cycles = steps; // counter for cycles left
// populate the object with the initial state
$.each(attrs, function(k,v) {
start[k] = $el.attr(k);
});
(function loop() {
$.each(attrs, function(k,v) { // cycle each attribute
var pst = (v - start[k])/steps; // how much to add at each step
$el.attr(k, function(i, old) {
return +old + pst; // add value do the old one
});
});
if (--cycles) // call the loop if counter is not exhausted
setTimeout(loop, timeout);
else // otherwise set final state to avoid floating point values
$el.attr(attrs);
})(); // start the loop
}
$('button').on('click', function() {
animate(
$('#rect1'), // target jQuery element
{ x:100, y:300, width:50, height:100 }, // target attributes
2000 // optional duration in ms, defaults to 400
);
});
回答2:
I would try something like this
<svg>
<rect class="myElement" id="rect1" x="10" y="20" width="100px" height="100px">
</svg>
in the script :
var myElemX = $('.myElement').attr('x');
var myElemY = $('.myElement').attr('y');
$("#rect1").animate({
left: myElemX+'px',
top: myElemY+'px'
}, 1500 );
回答3:
Alright all answers here are either specific to SVG or reimplement the .animate() jQuery call, I found a way to use the jQuery call without running into the problem that the attribute gets reset to 0 when the animation starts:
Lets say we want to animate the width
and height
attribute of an img tag element with id image
. To animate it from its current value to 300 we could do this:
var animationDiv= $("<div></div>"); //we don't add this div to the DOM
var image= $("img#image");
//could use any property besides "top" and "left", but the value must be valid, that means concatenating a "px" to numerical attributes if they don't have it already (and removing them in the step callback if they do)
animationDiv.css("left", image.attr("width"));
animationDiv.css("top", image.attr("height"));
animationDiv.animate(
{
left: 300,
top: 300
},
{
duration: 2500,
step: function(value, properties) {
if (properties.prop == "left")
image.attr("width", value + "px")
else
image.attr("height", value + "px")
}
}
)
In this approach we use a div that is not inside the DOM and animate values in it, we then use the div CSS values to animate our element. Not very pretty but gets the job done, if you need to stop the animation you can call .stop()
on animationDiv.
jsfiddle
回答4:
I like the Hoffmann approach, but i think is more elegant without creating a virtual dom object.
This is my coffeescript snippet
$rects.each ->
that = @
$({width: 0}).animate
width: parseInt($(@).attr('width'))
,
duration: 2000
easing: 'easeIn'
step: ->
$(that).attr 'width', Math.round(@.width)
done: ->
console.log 'Done'
which compiles into
return $rects.each(function() {
var that;
that = this;
return $({
width: 0
}).animate({
width: parseInt($(this).attr('width'))
}, {
duration: 1000,
easing: 'easeIn',
step: function() {
return $(that).attr('width', Math.round(this.width));
},
done: function() {
return console.log('Done');
}
});
});
回答5:
this may fits you simple
$("your div id").css("position", "absolute").animate({
left: 159,
top: 430
});
来源:https://stackoverflow.com/questions/17360739/jquery-animate-for-element-attributes-not-style