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140 lines
4.4 KiB
Markdown
140 lines
4.4 KiB
Markdown
---
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id: bad87fee1348bd9aed008826
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title: Wähle gerade Elemente mit jQuery aus
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challengeType: 6
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forumTopicId: 18318
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required:
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-
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link: 'https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.2.0/animate.css'
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dashedName: target-even-elements-using-jquery
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---
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# --description--
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Mit den Selektoren `:odd` (ungerade) und `:even` (gerade) kannst du auch Elemente anhand ihrer Position auswählen.
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Beachte, dass jQuery einen Null-Index hat, was bedeutet, dass das erste Element in einer Auswahl die Position 0 hat. Das kann etwas verwirrend sein, da `:odd` entgegen der Intuition das zweite Element (Position 1), das vierte Element (Position 3) und so weiter auswählt.
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So würdest du alle ungeraden Elemente mit der Klasse `target` anvisieren und ihnen Klassen zuweisen:
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```js
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$(".target:odd").addClass("animated shake");
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```
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Versuche, alle geraden `target`-Elemente auszuwählen und ihnen die Klassen `animated` und `shake` zu geben. Denke daran, dass **even** sich auf die Position der Elemente bezieht, wenn du ein nullbasiertes System im Kopf hast.
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# --hints--
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Alle `target`-Elemente, die jQuery als gerade betrachtet, sollten wackeln.
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```js
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assert(
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$('.target:even').hasClass('animated') && $('.target:even').hasClass('shake')
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);
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```
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Du solltest den Selektor `:even` verwenden, um diese Elemente zu ändern.
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```js
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assert(code.match(/\:even/g));
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```
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Du solltest nur jQuery verwenden, um diese Klassen zu dem Element hinzuzufügen.
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```js
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assert(
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code.match(/\$\(".target:even"\)/g) ||
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code.match(/\$\('.target:even'\)/g) ||
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code.match(/\$\(".target"\).filter\(":even"\)/g) ||
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code.match(/\$\('.target'\).filter\(':even'\)/g)
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);
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```
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# --seed--
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## --seed-contents--
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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$("#target1").parent().css("background-color", "red");
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$("#right-well").children().css("color", "orange");
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$("#left-well").children().css("color", "green");
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$(".target:nth-child(2)").addClass("animated bounce");
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});
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</script>
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<!-- Only change code above this line -->
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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```
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# --solutions--
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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$("#target1").parent().css("background-color", "red");
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$("#right-well").children().css("color", "orange");
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$("#left-well").children().css("color", "green");
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$(".target:nth-child(2)").addClass("animated bounce");
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$(".target:even").addClass("animated shake");
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});
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</script>
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<!-- Only change code above this line -->
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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```
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