javascript 单击按钮时重置下拉值
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Reset Dropdown value on button click
提问by LovingMVC
I am calling a jquery function to clear my all input fields on button click, but my requirement is when you click on clear all button it should reset my dropdown value to 1 index not to 0 index.
我正在调用一个 jquery 函数来清除我点击按钮时的所有输入字段,但我的要求是当你点击清除所有按钮时,它应该将我的下拉值重置为 1 索引而不是 0 索引。
please let me know how i can do this.
请让我知道我该怎么做。
function ClearAll() {
$("#BasicCaseStatus").val(1); // This is my dropdown
}
This is my button.
这是我的按钮。
<a href="#" id="SearchClear" onclick="ClearAll()" class="clearallLink" >Clear All</a>
回答by Darin Dimitrov
Try this:
试试这个:
$('select option:eq(1)').prop('selected', 'selected')???;?
It will select the second <option>
in the dropdownlist. Or if you wanted to do this for a particular dropdown:
它将选择<option>
下拉列表中的第二个。或者,如果您想为特定下拉菜单执行此操作:
$('#BasicCaseStatus option:eq(1)').prop('selected', 'selected')???;?
回答by GregL
First you want to deselect all options, then filter to the second option and select it.
首先您要取消选择所有选项,然后过滤到第二个选项并选择它。
$('a.clearallLink').on('click', function() {
$('#BasicCaseStatus option').prop('selected', false).eq(1).prop('selected', true);
});
Note this works with jQuery 1.7 and onwards, I believe.
请注意,我相信这适用于 jQuery 1.7 及更高版本。
回答by ParaMeterz
function dropdown_clear()
{
$('#dropdownlist').html(null);
}
Here, I had created a function for clear the dropdown list on button click. Now, juzt copy paste the complete function and juzt call it on the button click.
在这里,我创建了一个功能,用于在单击按钮时清除下拉列表。现在,直接复制粘贴完整的功能,然后在单击按钮时直接调用它。
回答by Mattia Larentis
Js:
JS:
$('span').click(function(){ $("#BasicCaseStatus").val(1); });?
$('span').click(function(){ $("#BasicCaseStatus").val(1); });?
Html:
网址:
<select id="BasicCaseStatus">
<option>1</option>
<option>2</option>
<option>3</option>
</select>
<span>Clear All</span>
?Link: http://jsfiddle.net/J5EE7/
回答by codef0rmer
None of the above answers would work If the default selected option is not the first one. The best way to achieve this is to wrap a select dropdown in <form>
tag and call the reset() function.
如果默认选择的选项不是第一个,则上述答案均无效。实现此目的的最佳方法是在<form>
标签中包装一个选择下拉列表并调用 reset() 函数。
<form id='frm'>
<select id="BasicCaseStatus">
<option>1</option>
<option selected>2</option>
<option>3</option>
</select>
<span>Clear All1 | </span>
</form>
$('span').click(function(){
$('form')[0].reset()
});
回答by Nerijus Gedrimas
- Don't write javascript code in HTML file (Remove onclick)
- Use this js code to select second value from the list:
- 不要在 HTML 文件中编写 javascript 代码(删除 onclick)
- 使用此 js 代码从列表中选择第二个值:
$('#BasicCaseStatus').prop('selectedIndex', 1);
$('#BasicCaseStatus').prop('selectedIndex', 1);
回答by ravichand
be it in jquery or javascript :-
$('#idname').html(null); or
document.getElementById('#idname').selectedIndex = 0; or
document.getElementById('#idname').selectedIndex = -1;
the options hasn't worked for me in dynamic dropdown list. so, i have tried
$('#idname').val("")
try oneself for good results.
回答by madhu
Use this for JQuery $("#droplist").empty();
将此用于 JQuery $("#droplist").empty();
回答by franzisk
I think the most elegant solution is this
我认为最优雅的解决方案是这个
$('#BasicCaseStatus option:eq(1)').prop("selected",true);