[英]search for values in select box using javascript/jQuery
I am trying to search the options within a HTML select to find which options have values matching any element in an array 我试图在HTML选择中搜索选项,以查找哪些选项的值与数组中的任何元素匹配
For example, I have an array of integer values like so: 例如,我有一个整数值数组,如下所示:
var arrTaken = [641, 640];
and I have a select element like so: 我有一个像这样的选择元素:
<select id="Substance3" name="Substance_3">
<option value="640">A</option>
<option value="641">B</option>
<option value="642">C</option>
<option value="643">D</option>
<option value="644">E</option>
</select>
Then I loop through the options on the select in an attempt to find any element value matching: 然后我遍历select上的选项,试图找到任何匹配的元素值:
$('#Substance3 > option').each(function(index, element)
{
console.log('current element value is: ' + element.value);
var index = arrTaken.indexOf(element.value);
console.log('element is at index: ' + index);
});
The problem is that the index is returned as -1, meaning the value was not found in the array. 问题是索引返回-1,表示在数组中找不到该值。 However, trying with
但是,尝试着
var index = arrTaken.indexOf(640);
works 作品
What am I doing wrong here? 我在这做错了什么?
Convert the value to a number first: 首先将值转换为数字:
var index = arrTaken.indexOf(+element.value);
// ^ unary plus
.indexOf
uses strict equality comparison (same as ===
). .indexOf
使用严格的相等比较(与===
相同)。 element.value
returns a string, while your array contains numbers. element.value
返回一个字符串,而您的数组包含数字。
将数组声明为此
var arrTaken = ['641', '640'];
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