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HomeWeb Front-endJS Tutorialjquery 操作checkbox、radio、select 小结

jquery radio的操作:

<code class="language-html"><input type="radio" name="rd" checked id="rd1" value="rd1">
<input type="radio" name="rd" id="rd2" value="rd2">
<input type="radio" name="rd" id="rd3" value="rd3"></code>

1.获取选中值,三种方法都可以: 

<code class="language-javascript">$('input:radio:checked').val(); 
$("input[type='radio']:checked").val(); 
$("input[name='rd']:checked").val(); </code>


2.设置第一个Radio为选中值: 

<code class="language-javascript">$('input:radio:first').attr('checked', 'checked'); 
或者 
$('input:radio:first').attr('checked', 'true');</code>

注: attr("checked",'checked')= attr("checked", 'true')= attr("checked", true) 


3.设置最后一个Radio为选中值: 

<code class="language-javascript">$('input:radio:last').attr('checked', 'checked'); 
或者 
$('input:radio:last').attr('checked', 'true'); </code>


4.根据索引值设置任意一个radio为选中值: 

<code class="language-javascript">$('input:radio').eq(索引值).attr('checked', 'true');索引值=0,1,2.... 
或者 
$('input:radio').slice(1,2).attr('checked', 'true'); </code>


5.根据Value值设置Radio为选中值 

<code class="language-javascript">$("input:radio[value='rd2']").attr('checked','true'); 
或者 
$("input[value='rd2']").attr('checked','true'); </code>


6.删除Value值为rd2的Radio 

<code class="language-javascript">$("input:radio[value='rd2']").remove(); </code>


7.删除第几个Radio 

<code class="language-javascript">$("input:radio").eq(索引值).remove();索引值=0,1,2.... 
如删除第3个Radio:$("input:radio").eq(2).remove(); </code>


8.遍历Radio 

<code class="language-javascript">$('input:radio').each(function(index,domEle){ 
//写入代码 
}); </code>

 

jquery select的操作

<code class="language-html"><select id="sel">
    <option value="1" selected>a</option>
    <option value="2">b</option>
    <option value="3">c</option>
    <option value="4">d</option>
    <option value="5">e</option>
</select></code>

1. 获取选中项: 
获取选中项的Value值: 

<code class="language-javascript">$('select#sel option:selected').val(); 
或者 
$('select#sel').find('option:selected').val(); </code>

获取选中项的Text值: 

<code class="language-javascript">$('select#seloption:selected').text(); 
或者 
$('select#sel').find('option:selected').text();</code>

 
2. 获取当前选中项的索引值: 

<code class="language-javascript">$('select#sel').get(0).selectedIndex; </code>


3. 获取当前option的最大索引值: 

<code class="language-javascript">$('select#sel option:last').attr("index") </code>


4. 获取DropdownList的长度: 

<code class="language-javascript">$('select#sel')[0].options.length; 
或者 
$('select#sel').get(0).options.length; </code>


5. 设置第一个option为选中值: 

<code class="language-javascript">$('select#sel option:first').attr('selected','true') 
或者 
$('select#sel')[0].selectedIndex = 0; </code>


6. 设置最后一个option为选中值: 

<code class="language-javascript">$('select#sel option:last).attr('selected','true') </code>


7. 根据索引值设置任意一个option为选中值: 

<code class="language-javascript">$('select#sel')[0].selectedIndex =索引值;索引值=0,1,2.... </code>


8. 设置Value=4 的option为选中值: 

<code class="language-javascript">$('select#sel').attr('value','4'); 
或者 
$("select#sel option[value='4']").attr('selected', 'true'); </code>


9. 删除Value=3的option: 

<code class="language-javascript">$("select#sel option[value='3']").remove(); </code>


10.删除第几个option: 

<code class="language-javascript">$(" select#sel option ").eq(索引值).remove();索引值=0,1,2.... 
如删除第3个Radio: 
$(" select#sel option ").eq(2).remove(); </code>


11.删除第一个option: 

<code class="language-javascript">$(" select#sel option ").eq(0).remove(); 
或者 
$("select#sel option:first").remove();</code>

 
12. 删除最后一个option: 

<code class="language-javascript">$("select#sel option:last").remove(); </code>


13. 删除dropdownlist: 

<code class="language-javascript">$("select#sel").remove(); </code>


14.在select后面添加一个option: 

<code class="language-javascript">$("select#sel").append("<option value="6">f</option>");</code>

 
15. 在select前面添加一个option: 

<code class="language-javascript">$("select#sel").prepend("<option value="0">0</option>"); </code>


16. 遍历option: 

<code class="language-javascript">$(' select#sel option ').each(function (index, domEle) { 
//写入代码 
}); </code>

 

jquery checkbox的操作

<code class="language-html"><input type="checkbox" name="ck1" checked id="ck1" value="1">
<input type="checkbox" name="ck2" id="ck2" value="2">
<input type="checkbox" name="ck3" id="ck3" value="3">
<input type="checkbox" name="ck4" id="ck4" value="4"></code>

1. 获取单个checkbox选中项(三种写法): 

<code class="language-javascript">$("input:checkbox:checked").val() 
或者 
$("input:[type='checkbox']:checked").val(); 
或者 
$("input:[name='ck']:checked").val(); </code>


2. 获取多个checkbox选中项: 

<code class="language-javascript">$('input:checkbox').each(function() { 
if ($(this).attr('checked') ==true) { 
alert($(this).val()); 
} 
}); </code>


3. 设置第一个checkbox 为选中值: 

<code class="language-javascript">$('input:checkbox:first').attr("checked",'checked'); 
或者 
$('input:checkbox').eq(0).attr("checked",'true'); </code>


4. 设置最后一个checkbox为选中值: 

<code class="language-javascript">$('input:radio:last').attr('checked', 'checked'); 
或者 
$('input:radio:last').attr('checked', 'true'); </code>


5. 根据索引值设置任意一个checkbox为选中值: 

<code class="language-javascript">$('input:checkbox).eq(索引值).attr('checked', 'true');索引值=0,1,2.... 
或者 
$('input:radio').slice(1,2).attr('checked', 'true');</code>

 
6. 选中多个checkbox: 
同时选中第1个和第2个的checkbox: 

<code class="language-javascript">$('input:radio').slice(0,2).attr('checked','true'); </code>


7. 根据Value值设置checkbox为选中值: 

<code class="language-javascript">$("input:checkbox[value='1']").attr('checked','true'); </code>


8. 删除Value=1的checkbox: 

<code class="language-javascript">$("input:checkbox[value='1']").remove(); </code>


9. 删除第几个checkbox: 

<code class="language-javascript">$("input:checkbox").eq(索引值).remove();索引值=0,1,2.... 
如删除第3个checkbox: 
$("input:checkbox").eq(2).remove(); </code>


10.遍历checkbox: 

<code class="language-javascript">$('input:checkbox').each(function (index, domEle) { 
//写入代码 
}); </code>


11.全部选中 

<code class="language-javascript">$('input:checkbox').each(function() { 
$(this).attr('checked', true); 
}); </code>


12.全部取消选择

<code class="language-javascript">$('input:checkbox').each(function () { 
$(this).attr('checked',false); 
});</code>

 

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