141 lines
3.9 KiB
Markdown
141 lines
3.9 KiB
Markdown
---
|
||
id: bad87fee1348bd9aed308826
|
||
title: 使用 jQuery 选择元素的父元素
|
||
challengeType: 6
|
||
forumTopicId: 18321
|
||
dashedName: target-the-parent-of-an-element-using-jquery
|
||
---
|
||
|
||
# --description--
|
||
|
||
每个 HTML 标签都默认 `inherits`（继承）其 `parent`（父标签）的 CSS 属性。
|
||
|
||
例如，`h3` 标签 `jQuery Playground` 的父标签是 `<div class="container-fluid">`，而这个标签的父标签是 `body`。
|
||
|
||
jQuery 有一个 `parent()` 方法，可以访问被选取标签的父标签。
|
||
|
||
下面的代码展示了使用 `parent()` 方法把 `left-well` 标签的父标签背景色设置成蓝色（blue）：
|
||
|
||
```js
|
||
$("#left-well").parent().css("background-color", "blue")
|
||
```
|
||
|
||
把 `#target1` 元素的父元素背景色设置成红色（red）。
|
||
|
||
# --hints--
|
||
|
||
`left-well` 元素应该有红色的背景。
|
||
|
||
```js
|
||
assert(
|
||
$('#left-well').css('background-color') === 'red' ||
|
||
$('#left-well').css('background-color') === 'rgb(255, 0, 0)' ||
|
||
$('#left-well').css('background-color').toLowerCase() === '#ff0000' ||
|
||
$('#left-well').css('background-color').toLowerCase() === '#f00'
|
||
);
|
||
```
|
||
|
||
应该用 `.parent()` 函数修改该元素。
|
||
|
||
```js
|
||
assert(code.match(/\.parent\s*\(\s*\)\s*\.css/g));
|
||
```
|
||
|
||
应该在 `#target1` 元素上调用 `.parent()` 方法。
|
||
|
||
```js
|
||
assert(
|
||
code.match(/\$\s*?\(\s*?(?:'|")\s*?#target1\s*?(?:'|")\s*?\)\s*?\.parent/gi)
|
||
);
|
||
```
|
||
|
||
应该仅用 jQuery 给元素添加 class。
|
||
|
||
```js
|
||
assert(code.match(/<div class="well" id="left-well">/g));
|
||
```
|
||
|
||
# --seed--
|
||
|
||
## --seed-contents--
|
||
|
||
```html
|
||
<script>
|
||
$(document).ready(function() {
|
||
$("#target1").css("color", "red");
|
||
$("#target1").prop("disabled", true);
|
||
$("#target4").remove();
|
||
$("#target2").appendTo("#right-well");
|
||
$("#target5").clone().appendTo("#left-well");
|
||
|
||
});
|
||
</script>
|
||
|
||
<!-- Only change code above this line -->
|
||
|
||
<body>
|
||
<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>
|
||
</body>
|
||
```
|
||
|
||
# --solutions--
|
||
|
||
```html
|
||
<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");
|
||
});
|
||
</script>
|
||
|
||
<!-- Only change code above this line -->
|
||
|
||
<body>
|
||
<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>
|
||
</body>
|
||
```
|