关于javascript:是否可以测试选择框中有多少个选项?

Is it possible to test how many options are in a select box?

我正在使用 jQuery 1.6.2.

我正在使用 ColdFusion 和 jQuery 动态填充选择框。

When the options are returned and stuffed inside the select box, I'd jQuery to figure out how many options there are and adjust the size attr as needed.

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// load the options into the select box
$("#Select").load("GlobalAdmin/ArtistUnassociatedAlbums.cfm?" + QString);

// test the number of options
var NumOfOptions = $();
var BoxSize = 0;

// do a calculation
if (NumOfOptions > 10) {
    BoxSize = 10;
} else {
    BoxSize = NumOfOptions ;
}

// adjust the select box size
$("#AlbumsSelect").attr("size", BoxSize );

如何有效地获得返回的选项数量?


是的,只需使用 length 属性...

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var numOfOptions = $('#Select option').length;


只需选择选项并测试生成的 jQuery 对象的长度属性:

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console.log($("#Select option").length);

你可以使用这个:

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var NumOfOptions = $("#AlbumsSelect option").length;


尝试使用javascript的属性.length

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var length = $("option").length;