添加“选定的"归因于jQuery的下拉选项 [英] Add the "selected" attribute to a drop down option with jQuery

问题描述

如何基于与某些变量匹配的选项将已选择"属性添加到下拉菜单选项中?

How do I add the attribute "selected" to a drop down menu option based on that option matching some variable?

以下是填充下拉列表的方式...

Here is how the dropdown is populated...

loginOptions = ["First", "Second", "Third"];
        var Login = $( '#Login' );

        for ( var i = 0; i < loginOptions.length; i++ ) {
            Login.append('<option value="'+ loginOptions[i] +'">'+             loginOptions[i] +'</option>');
        }

我想根据一个选项的值是否与另一个变量匹配来将其标记为选中".因此，如果loginOption[i]等于var existingLoginValue，则将该选项设置为'selected'

I want to mark one option as "selected" based on whether or not its value matches another variable. so if loginOption[i] is equal to var existingLoginValue then set that option to 'selected'

可以做到的

if(loginOptions[i] === existingLoginValue){ print 'selected'; };

谢谢！

推荐答案

我会使用 .val() 在方法的最后，它基于值进行设置，如下所示:

I'd use .val() at the end of your method, this sets based on value, like this:

$('#Login').val(existingLoginValue);

类似地，要获取该值，请在不使用诸如此类的任何参数的情况下调用它:

Similarly, to get the value, call it without any parameters like this:

var currentValue = $('#Login').val();

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