当选择其他选择下拉列表中的选项时，jQuery显示/隐藏一个选择下拉列表中的选项 [英] jQuery show/hide options from one select drop down, when option on other select dropdown is slected

问题描述

我需要在一个选择下拉列表中显示/隐藏选项，具体取决于另一个选择下拉选项。

I need to show/hide options on one select drop down dependant on another select drop down options.

下面的代码显示了我想要实现的目标。

The code below shows what I am trying to achieve.

如果'column_select'选择菜单选项设置为'1列'，则'layout_select'选择菜单必须仅显示'none'选项。

If the 'column_select' select menu option is set to '1 column' then the 'layout_select' select menu must display only the 'none' option.

如果'column_select'选择菜单选项设置为'2列'，那么'layout_select'选择菜单必须只显示'layout 1'和'layout 2'选项。

If the 'column_select' select menu option is set to '2 column' then the 'layout_select' select menu must display only the 'layout 1' and 'layout 2' options.

如果'column_select'选择菜单选项设置为'3列'，那么'layout_select'选择菜单必须只显示'布局3'，'布局4'和'布局5'选项。

If the 'column_select' select menu option is set to '3 column' then the 'layout_select' select menu must display only the 'layout 3', 'layout 4' and 'layout 5' options.

<select name="column_select" id="column_select">
    <option value="col1">1 column</option>
    <option value="col2">2 column</option>
    <option value="col3">3 column</option>
</select>

<select name="layout_select" id="layout_select">
    <!--Below shows when '1 column' is selected is hidden otherwise-->
    <option value="col1">none</option>

    <!--Below shows when '2 column' is selected is hidden otherwise-->
    <option value="col2_ms">layout 1</option> 
    <option value="col2_sm">layout 2</option>

    <!--Below shows when '3 column' is selected is hidden otherwise-->
    <option value="col3_mss">layout 3</option>
    <option value="col3_ssm">layout 4</option>
    <option value="col3_sms">layout 5</option>
</select>

到目前为止，我所尝试的一切都失败了......我是jQuery的新手。如果有人可以请求帮助，将不胜感激。谢谢！

So far everything I have tried has failed abysmally.... I am new to jQuery. If anybody could please help it would be much appreciated. Thanks!

推荐答案

尝试 -

$("#column_select").change(function () {
    $("#layout_select").children('option').hide();
    $("#layout_select").children("option[value^=" + $(this).val() + "]").show()
})  

如果您打算使用此解决方案，则需要隐藏除document.ready函数中的'none'值之外的所有元素。 / p>

If you were going to use this solution you'd need to hide all of the elements apart from the one with the 'none' value in your document.ready function -

$(document).ready(function() {
    $("#layout_select").children('option:gt(0)').hide();
    $("#column_select").change(function() {
        $("#layout_select").children('option').hide();
        $("#layout_select").children("option[value^=" + $(this).val() + "]").show()
    })
})

演示 - http://jsfiddle.net/Mxkfr/2

编辑

我可能对此有点遗憾，但这是另一个使用原始选择列表选项的缓存以确保'layout_select'列表完全重置的示例/ 'column_select'列表更改后清除（包括'none'选项） -

I might have got a bit carried away with this, but here's a further example that uses a cache of the original select list options to ensure that the 'layout_select' list is completely reset/cleared (including the 'none' option) after the 'column_select' list is changed -

$(document).ready(function() {
    var optarray = $("#layout_select").children('option').map(function() {
        return {
            "value": this.value,
            "option": "<option value='" + this.value + "'>" + this.text + "</option>"
        }
    })

    $("#column_select").change(function() {
        $("#layout_select").children('option').remove();
        var addoptarr = [];
        for (i = 0; i < optarray.length; i++) {
            if (optarray[i].value.indexOf($(this).val()) > -1) {
                addoptarr.push(optarray[i].option);
            }
        }
        $("#layout_select").html(addoptarr.join(''))
    }).change();
})

演示 - http://jsfiddle.net/N7Xpb/1/

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