javascript - How to get variable into chained function with mootools -


i've created function spice html forms check if fields valid on submit, , if not flashed red warn users. works great until tries return color normal.

if (response.length > 0) {   (var = 0; < response.length; i++) {     if (response[i].getattribute('field') != '') {       var errfield = $(response[i].getattribute('field')+'err');        if (errfield) {         errfield.set('html', response[i].getattribute('msg'));         var color = errfield.getstyle('color');         window['cfx'+i] = new fx.morph(errfield, {           duration: 400,           transition: fx.transitions.quad.easeinout         });          window['cfx'+i].start({'color': '#000000'}).chain(function() {           window['cfx'+i].start({'color': color});         });       }     }   } }

i've debugged point can tell crashed when gets inside chained function, because loses variable @ point. i've looked around , can't figure out how i chain function work.

erm. basically, iterator run , value of i passed chained function index of last item in iteration, always.

several things can - local closure near calls 1 or rewriting whole loop use array.prototype.each so:

response.each(function(el, i){     if (el.getattribute('field') != ''){         var errfield = $(el.getattribute('field') + 'err');          if (errfield){             errfield.set('html', el.getattribute('msg'));             var color = errfield.getstyle('color');             window['cfx' + i] = new fx.morph(errfield, {                 duration: 400,                 transition: fx.transitions.quad.easeinout             });              window['cfx' + i].start({'color': '#000000'}).chain(function(){                 window['cfx' + i].start({'color': color});             });         }     } });

the value of i above fixed iterator within function scope each iteration, hence producing desired effect.

alternatively these work:

// permanent reference var cfx = window['cfx' + i]; cfx.start({'color': '#000000'}).chain(function(){     cfx.start({'color': color}); });  // binding function via outer scope element window['cfx' + i].start({'color': '#000000'}).chain(function(){     this.start({'color': color}); }.bind(window['cfx' + i]));  // encapsulating local closure (function(i){     // immutable here     window['cfx' + i].start({'color': '#000000'}).chain(function(){         window['cfx' + i].start({'color': color});     }); }(i));

and finally, scope of chained functions fx instance, keeps reference element being chained in this.element point element , this instance, hence can do:

window['cfx' + i].start({'color': '#000000'}).chain(function(){     this.start({'color': color}); });

that's it. have fun


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