JavaScript:根据选项文本设置下拉选择项
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JavaScript: set dropdown selected item based on option text
提问by user1017477
say I have a dropdown list like this:
说我有一个这样的下拉列表:
<select id="MyDropDown">
<option value="0">Google</option>
<option value="1">Bing</option>
<option value="2">Yahoo</option>
</select>
and I want to set the selected value based on the option text, not the value with javascript. How can I go about doing this? For example, with c# I can do something like the example below and the the option with "Google" would be selected.
我想根据选项文本设置选定的值,而不是使用 javascript 的值。我该怎么做呢?例如,使用 c#,我可以执行以下示例中的操作,并且将选择带有“Google”的选项。
ListItem mt = MyDropDown.Items.FindByText("Google");
if (mt != null)
{
mt.Selected = true;
}
Thanks in advance for any help!
在此先感谢您的帮助!
回答by Gabriel McAdams
var textToFind = 'Google';
var dd = document.getElementById('MyDropDown');
for (var i = 0; i < dd.options.length; i++) {
if (dd.options[i].text === textToFind) {
dd.selectedIndex = i;
break;
}
}
回答by Danyal Aytekin
A modern alternative:
现代替代方案:
const textToFind = 'Google';
const dd = document.getElementById ('MyDropDown');
dd.selectedIndex = [...dd.options].findIndex (option => option.text === textToFind);
回答by janechii
You can loop through the select_obj.options. There's a #text method in each of the option object, which you can use to compare to what you want and set the selectedIndex of the select_obj.
您可以遍历 select_obj.options。每个选项对象中都有一个 #text 方法,您可以使用它来与您想要的内容进行比较并设置 select_obj 的 selectedIndex。