How do you know which parameters to set for a javascript function? -

-

coming java, javascript can frustrating.

i'm hoping can put simple terms me.

i'm struggling understand how javascript programmers know parameters pass method they're calling - when method being called callback (which in eyes seems added level of complexity).

for example, take function addeventlistener. in function, typical use looks like

mydomitem.addeventlistener("click", function(e){...}, false);

in documentation function (hyperlinked name above) don't see mention of option. whereas in java can know if parameters match type ide, in javascript seems huge guessing game or requires serious in-depth knowledge of each function.

how javascript programmers it?

the documentation linked show form in example:

target.addeventlistener(type, listener[, usecapture]);

the type parameter string "click", listener function object, , usecapture false.


Comments

Post a Comment

Popular posts from this blog

java - Oracle EBS .ClassNotFoundException: oracle.apps.fnd.formsClient.FormsLauncher.class ERROR -

-
i need in configuring java on machine because, when try loading forms, loader goes in circles , gives error: java.lang.classnotfoundexception: oracle.apps.fnd.formsclient.formslauncher.class @ sun.plugin2.applet.applet2classloader.findclass(unknown source) @ sun.plugin2.applet.plugin2classloader.loadclass0(unknown source) @ sun.plugin2.applet.plugin2classloader.loadclass(unknown source) @ sun.plugin2.applet.plugin2classloader.loadclass(unknown source) @ java.lang.classloader.loadclass(unknown source) @ sun.plugin2.applet.plugin2classloader.loadcode(unknown source) @ sun.plugin2.applet.plugin2manager.createapplet(unknown source) @ sun.plugin2.applet.plugin2manager$appletexecutionrunnable.run (unknown source) @ java.lang.thread.run(unknown source) i have tried re-installing firefox, older versions of java runtime environments, disabling proxy. what missing? application working on other machines. i spent around 100 hours finding s
Read more

c# - how to use buttonedit in devexpress gridcontrol -

-
Image
i trying create gridcontrol buttonedit in 1 of columns. when user clicks button edit, popups form select product. when selection done on popup, returns datarow selection main grid below. but when column loses focus, value wrote column disappear. here code creates gridcontrol's data , buttonedit's click event. private void frmsiparisnew_load(object sender, eventargs e) { dt = new datatable(); dt.columns.add("malzeme_kodu",typeof(string)); dt.columns.add("malzeme_aciklama", typeof(string)); dt.columns.add("adet", typeof(decimal)); dt.columns.add("birim", typeof(string)); dt.columns.add("fiyat", typeof(decimal)); dt.columns.add("kur", typeof(string)); dt.columns.add("tutar", typeof(decimal)); datarow dr = dt.newrow(); dt.rows.add(dr); gc.datasource = dt; } private void repositoryitembuttoneditmal
Read more

nvd3.js - angularjs-nvd3-directives setting color in legend as well as in chart elements -

-
good morning i using angularjs-nvd3-directives, great, having difficulties when setting color of multi bar chart ( http://cmaurer.github.io/angularjs-nvd3-directives/multi.bar.chart.html ). the show legend works well: <div ng-controller="examplectrl"> <nvd3-multi-bar-chart data="exampledata" id="showlegendexample" width="550" height="300" showxaxis="true" showyaxis="true" xaxistickformat="xaxistickformatfunction()" showlegend="true"> <svg></svg> </nvd3-multi-bar-chart> </div> but when add option in conjunction color="colorfunction()" where, var colorarray = ['#ff0000', '#0000ff', '#ffff00', '#00ffff']; $scope.colorfunction = function() { return function(d, i) { return colorarray[i]; }; } the color of cha
Read more