freeCodeCamp/curriculum/challenges/english/03-front-end-libraries/jquery/target-even-elements-using-jquery.english.md

id	title	required	challengeType	forumTopicId
bad87fee1348bd9aed008826	Target Even Elements Using jQuery	link https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.2.0/animate.css	6	18318

Description

You can also target elements based on their positions using :odd or :even selectors. Note that jQuery is zero-indexed which means the first element in a selection has a position of 0. This can be a little confusing as, counter-intuitively, :odd selects the second element (position 1), fourth element (position 3), and so on. Here's how you would target all the odd elements with class target and give them classes: $(".target:odd").addClass("animated shake"); Try selecting all the even target elements and giving them the classes of animated and shake. Remember that even refers to the position of elements with a zero-based system in mind.

Instructions

Tests

tests:
  - text: All of the <code>target</code> elements that jQuery considers to be even should shake.
    testString: assert($('.target:even').hasClass('animated') && $('.target:even').hasClass('shake'));
  - text: You should use the <code>&#58;even</code> selector to modify these elements.
    testString: assert(code.match(/\:even/g));
  - text: Only use jQuery to add these classes to the element.
    testString: assert(code.match(/\$\(".target:even"\)/g) || code.match(/\$\('.target:even'\)/g) || code.match(/\$\(".target"\).filter\(":even"\)/g) || code.match(/\$\('.target'\).filter\(':even'\)/g));

Challenge Seed

<script>
  $(document).ready(function() {
    $("#target1").css("color", "red");
    $("#target1").prop("disabled", true);
    $("#target4").remove();
    $("#target2").appendTo("#right-well");
    $("#target5").clone().appendTo("#left-well");
    $("#target1").parent().css("background-color", "red");
    $("#right-well").children().css("color", "orange");
    $("#left-well").children().css("color", "green");
    $(".target:nth-child(2)").addClass("animated bounce");

  });
</script>

<!-- Only change code above this line. -->

<div class="container-fluid">
  <h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
    <div class="col-xs-6">
      <h4>#left-well</h4>
      <div class="well" id="left-well">
        <button class="btn btn-default target" id="target1">#target1</button>
        <button class="btn btn-default target" id="target2">#target2</button>
        <button class="btn btn-default target" id="target3">#target3</button>
      </div>
    </div>
    <div class="col-xs-6">
      <h4>#right-well</h4>
      <div class="well" id="right-well">
        <button class="btn btn-default target" id="target4">#target4</button>
        <button class="btn btn-default target" id="target5">#target5</button>
        <button class="btn btn-default target" id="target6">#target6</button>
      </div>
    </div>
  </div>
</div>

Solution

<script>
  $(document).ready(function() {
    $("#target1").css("color", "red");
    $("#target1").prop("disabled", true);
    $("#target4").remove();
    $("#target2").appendTo("#right-well");
    $("#target5").clone().appendTo("#left-well");
    $("#target1").parent().css("background-color", "red");
    $("#right-well").children().css("color", "orange");
    $("#left-well").children().css("color", "green");
    $(".target:nth-child(2)").addClass("animated bounce");
    $(".target:even").addClass("animated shake");
  });
</script>

<!-- Only change code above this line. -->

<div class="container-fluid">
  <h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
    <div class="col-xs-6">
      <h4>#left-well</h4>
      <div class="well" id="left-well">
        <button class="btn btn-default target" id="target1">#target1</button>
        <button class="btn btn-default target" id="target2">#target2</button>
        <button class="btn btn-default target" id="target3">#target3</button>
      </div>
    </div>
    <div class="col-xs-6">
      <h4>#right-well</h4>
      <div class="well" id="right-well">
        <button class="btn btn-default target" id="target4">#target4</button>
        <button class="btn btn-default target" id="target5">#target5</button>
        <button class="btn btn-default target" id="target6">#target6</button>
      </div>
    </div>
  </div>
</div>