JQuery学习笔记
1.从$开始
对于熟悉prototype的朋友,$符号应该很熟悉,
prototype: var element = $(’eleId’)
jquery: var element = $(’#eleId’)
DOM: var element = document.getElementById(’eleId’)
$(’#j1′).html()
<div id=“j1“>Hello, jQuery!</content>
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以上三种选择方式是等价的,相比prototype来说jquery多了个#号
例:
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2.通过xpath+css来获取你想要的…
1).
在这段例子中我们需要用到的HTML代码
<div class=”contentToChange”>
<p class=”alert”>警告!警告!警告!警告!</p>
<p class=”firstParagraph”>我是第一段</p>
<p class=”secondParagraph”>第二段,哎,火箭输球了
0比33!火箭替补钉上耻辱柱 <em>姚麦</em>身边再无可用之人频繁失误成姚明致命毒药 板凳消失是火箭落后主因</p>
</div>
1).
在这段例子中我们需要用到的HTML代码
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jquery代码:
//获取div.contentToChange下p标记数组长度
alert($(’div.contentToChange p’).size())
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//通过调整高度来显示/隐藏所有匹配的元素,这里的匹配元素是p.firstParagraph
$(’div.contentToChange p.firstParagraph’).slideToggle(’slow’);
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//找到匹配所有div.contentToChange下所有css不为alert的p元素,并在其后面添加文字
$(’div.contentToChange p:not(.alert)’).append(’<strong class=“addText“>这是新加的文字</strong>‘);
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//找到所有为strong元素且css为addText的元素,然后删除
$(’strong.addText’).remove();
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//找到P标记下css为secondParagraph的元素,然后渐隐
$(’div.contentToChange p.secondParagraph’).hide(’slow’);
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//找到div.contentToChange下所有em元素,然后通过jquery中的css方法改变它们的颜色和字体
$(’div.contentToChange em’).css({color:“#993300“,fontWeight:“bold“});
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//添加css样式
$(’div.contentToChange p.secondParagraph’).addClass(’new‘)
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//删除css样式
$(’div.contentToChange p.secondParagraph’).removeClass(’new‘);
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![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
2).
在这段例子中我们需要用到的HTML代码:
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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jquery代码
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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注:
$(’#jqdt ol.groof > strong’) 其中的>代表只访问下一级子节点中包含strong的元素,
如果改为 $(’#jqdt ol.groof strong’) 则访问所有下级子节点中的strong元素,包括子节点的子节点等。
$(’#jqdt ol.groof > strong’) 其中的>代表只访问下一级子节点中包含strong的元素,
如果改为 $(’#jqdt ol.groof strong’) 则访问所有下级子节点中的strong元素,包括子节点的子节点等。
3).
常用的自定义选择器
:eq(0) 选择索引等于0也就是第一个元素
:gt(4) 选择所有索引大于4的元素
:lt(4) 选择所有索引小于4的元素
:first 等价于 :eq(0)
:last 选择最后一个元素
:parent 选择所有含有子节点的元素 (including text).
:contains(’test’) 选择含有指定文本的元素
:visible 选择所有可见元素(包含:display:block|inline,或者visibility为visible的元素,但是不包括表单元素(type hidden)
:hidden 选择所有隐藏元素(包含:display:none,或者visibility为hidden的元素,包括表单元素(type hidden)
$(’p:first’).css(’fontWeight’,'bold’)
$(’div:hidden’).show();
$(“div:contains(’test’)“).hide();
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$(’input[@name=bar]’).val() //获取名字为bar的input表单的值
$(’select[@name=slt]’).val() //获取名为slt的下拉菜单的选择中值
$(’input[@type=radio][@checked]’) //获取所有被选中的radio表单
例:
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表单选择器
:input Selects all form elements (input, select, textarea, button).
:text Selects all text fields (type=”text”).
:password Selects all password fields (type=”password”).
:radio Selects all radio fields (type=”radio”).
:checkbox Selects all checkbox fields (type=”checkbox”).
:submit Selects all submit buttons (type=”submit”).
:image Selects all form images (type=”image”).
:reset Selects all reset buttons (type=”reset”).
:button Selects all other buttons (type=”button”).
$(’myForm:input’)
$(’input:radio’,myForm)
//:radio等价于[@type=radio]
例:
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![点击图片可在新窗口打开](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
posted on 2008-12-29 23:06 Love Fendi 阅读(202) 评论(0) 编辑 收藏 举报