gwt 2.5 - JS functions in GWT -


how use simple js functions in gwt? (picture animation script example)

<script type="text/javascript"> var cspeed=4; var cwidth=64; var cheight=64; var ctotalframes=8; var cframewidth=64; var cimagesrc='images/sprites.gif';  var cimagetimeout=false; var cindex=0; var cxpos=0; var cpreloadertimeout=false; var seconds_between_frames=0;  function startanimation(){      document.getelementbyid('loaderimage').style.backgroundimage='url('+cimagesrc+')';     document.getelementbyid('loaderimage').style.width=cwidth+'px';     document.getelementbyid('loaderimage').style.height=cheight+'px';      //fps = math.round(100/(maxspeed+2-speed));     fps = math.round(100/cspeed);     seconds_between_frames = 1 / fps;      cpreloadertimeout=settimeout('continueanimation()', seconds_between_frames/1000);  }  function continueanimation(){      cxpos += cframewidth;     //increase index know frame of our animation on     cindex += 1;      //if our cindex higher our total number of frames, we're @ end , should restart     if (cindex >= ctotalframes) {         cxpos =0;         cindex=0;     }      if(document.getelementbyid('loaderimage'))         document.getelementbyid('loaderimage').style.backgroundposition=(-cxpos)+'px 0';      cpreloadertimeout=settimeout('continueanimation()', seconds_between_frames*1000); }  function stopanimation(){//stops animation     cleartimeout(cpreloadertimeout);     cpreloadertimeout=false; }  function imageloader(s, fun)//pre-loads sprites image {     cleartimeout(cimagetimeout);     cimagetimeout=0;     genimage = new image();     genimage.onload=function (){cimagetimeout=settimeout(fun, 0)};     genimage.onerror=new function('alert(\'could not load image\')');     genimage.src=s; }  //the following code starts animation new imageloader(cimagesrc, 'startanimation()');

tried wrapping

    public static native void anim() /*-{    js here }-*/;

but uncaught referenceerror: startanimation not defined

i've seen http://www.gwtproject.org/doc/latest/devguidecodingbasicsjsni.html didn't find examples js functions

you can use jsni:

method 1: if call imageloader fun = 'startanimation()', mean, use imageloader way: imageloader(s, 'startanimation()');

class yourmethods {     public static native void imageloader(string s) /*-{     imageloader(s, 'startanimation()');     }-*/; }

you can call method this:

yourmethods::imageloader(s);

method 2: if fun parameter change (is not 'startanimation()'), type string

class yourmethods {     public static native void imageloader(string s, string fun) /*-{     imageloader(s, fun);     }-*/; }

in case: define second parameter "javascript name of function", , call way:

yourmethods::imageloader(s, "startanimation()");

and gwt understand fun parameter name of javascript function, , type string

method 3: convert javascript code gwt


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