javascript - How to make jQuery variable toggle buttons? -


i'm making app can customize opacity of different elements. app has simple "up" , "down" buttons, increasing , decreasing opacity. however, toggle functions not implementing in css. here's html:

<div id="container">make me lighter.</div> <br> <br> <button id="up">up</button> <br> <button id="down">down</button>

css:

* {      margin: 0px;      padding:0px }  #container {      padding: 10px;      border: 10px solid; }

and jquery:

$(document).ready(function () {     var x = 0.5;      $("#up").click(function () {         var x = x += 0.2;     });     $("#down").click(function () {         var x = x -= 0.2;     });      $("#container").css({         'opacity', x     }); });

this fiddle: http://jsfiddle.net/j96bu778/1/

i've spent lot of time looking questions on stack overflow, , of answers confusing understand. jquery api didn't me either.

thanks help.

there number of things wrong code (but don't discouraged!):

  1. var x = x += 0.2; not kind of assignment you're trying do. increments x 0.2, assigns new local variable x value of evaluated x. since x accessible scope of callback functions, use x += .2.
  2. { 'opacity', x } in css function argument not valid object notation. you're looking { opacity: x }.
  3. you need set css of elements when buttons pressed. omitting event callbacks, buttons don't anything. i've moved $("#container").css({opacity: x}); inside callback functions.

now fixed:

$(document).ready(function() {     var x = 0.5;     $("#up").click(function(){         x += .2;         $("#container").css({opacity: x});      });     $("#down").click(function(){         x -= .2;         $("#container").css({opacity: x});      }); });

check out working demo here: jsfiddle

i recommend reading on javascript before diving jquery, you'll have better understanding of how language works.


Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending ...
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change...
Read more

Rendering JButton to get the JCheckBox behavior in a JTable by using images does not update my table -

i rendering jbutton image on simulate jcheckbox behavior. why don't let jtable render jcheckbox? because need bigger checkboxes , there's no way can resize them (as far know). so, have own table cell renderer , editor. both renders jbutton , checkbox images on them. trying change image checked image unchecked image (or vice versa) , update cell value (boolean true or false). however, reason, getcelleditorvalue() not update table. so, release mouse, value goes original one. any appreciated! lot! public class tableexample extends jframe { jscrollpane pane; jpanel panel; jtable table; object[][] data; mytablemodel tm; renderer buttoncolumn; public tableexample(object[][] data) throws ioexception { string[] columns = {"column#1", "column#2", "column#3", "column#4", "column#5", "column#6"}; this.data = data; this.setpreferredsize(new dimension(700, 500)); ...
Read more