使用 javascript 将调查选择限制为三个唯一值

发布于 2024-08-31 11:37:18 字数 5305 浏览 2 评论 0 原文

我需要使用有限的调查应用程序，并且必须调整提供的代码以满足更高级的功能。

我需要创建一个加权排名问题，以便用户可以选择他们的前三个选择，数据将进入调查应用程序并可在调查报告中访问。该应用程序仅支持两种类型的问题（文本填充和多项选择），但我可以更改代码，只要它仍然将表单数据发送回调查应用程序即可。

该代码已设置为每个选项都会显示 0-3 的下拉菜单。现在我想限制用户的选择，让他们只能选择“1”“2”或“3”之一，总共三个选择。理想情况下，如果用户已经为一个选项选择了“2”，并且尝试为另一个选项选择它，则会将第一个“2”设置为“0”或空白。

这可以用javascript来做吗？如果是这样，有谁知道一个网站可能会显示这样的代码，或者提供足够类似的示例以便我可以调整它？

当前代码在这里：

<html>
<head><title>Survey</title></head>
<!-- Changes
- remove br to put dropdown next to text for each item.  Switch text & dropdown order    
for each item.
- add comments to separate each question
- removed blue title font
- add instructions

Goals
- limit choices to one 1 one 2 and one 3, three choices total.
-->
<link href="---" rel="stylesheet" type="text/css">
<body bgcolor="#3c76a3">

<!-- TRANSITIONAL DIALOG BOX -->
<table border="0" align="center" cellpadding="0" cellspacing="0" style="background-attachment: scroll; background-color: #3c76a3; background-repeat: no-repeat; background-position: left top;" bgcolor="#3c76a3" topmargin="0" marginwidth="0" marginheight="0" width="100%" height="100%">
<tr>
<td>
<table border="0" align="center" cellpadding="0" cellspacing="0" id="survey">
<tr>

<td><p>&nbsp;</p>

<!-- HEADER END -->
<!-- FORM START TAG --><form name="survey" action="---" method="POST">
<FONT face="Verdana, Arial, Helvetica, sans-serif">
<b>survey</b><hr>

<!-- 1 -->
<input type=hidden name="Buy R.J. a DeLorean_multiple_answers" value="one">
<font size=2><select name="Buy R.J. a DeLorean" SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Buy R.J. a DeLorean_help" value="">
<b><font size=2>Buy R.J. a DeLorean</font></b>
<hr size=1>

<!-- 2 -->
<input type=hidden name="Fill Lisa's office with marshmallows._multiple_answers"     value="one">
<font size=2><select name="Fill Lisa's office with marshmallows." SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Fill Lisa's office with marshmallows._help" value="">
<b><font size=2>Fill Lisa's office with marshmallows.</font></b>
<hr size=1>

<!-- 3 -->
<input type=hidden name="Install a beer fridge in everyone's filing     cabinets._multiple_answers" value="one">
<font size=2><select name="Install a beer fridge in everyone's filing cabinets." SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Install a beer fridge in everyone's filing cabinets._help" value="">
<b><font size=2>Install a beer fridge in everyone's filing cabinets.</font></b>
<hr size=1>

<!-- 4 -->
<input type=hidden name="Buy a company Cessna_multiple_answers" value="one">
<font size=2><select name="Buy a company Cessna" SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Buy a company Cessna_help" value="">
<b><font size=2>Buy a company Cessna</font></b><br>
<hr size=1>

<!-- 5 -->
<input type=hidden name="Replace Conf2's chairs with miniature ponies._multiple_answers" value="one">
<font size=2><select name="Replace Conf2's chairs with miniature ponies." SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Replace Conf2's chairs with miniature ponies._help" value="">
<b><font size=2>Replace Conf2's chairs with miniature ponies.</font></b>
<hr size=1>

<input type="hidden" name="question_names" value="{Buy R.J. a DeLorean} {Fill Lisa's office with marshmallows.} {Install a beer fridge in everyone's filing cabinets.} {Buy a company Cessna} {Replace Conf2's chairs with miniature ponies.}">
<p align="right"><input type="image" BORDER=0 title="Save Changes" alt="Save Changes" src="---"  name="button_save_changes">
<input type="hidden" name="showconfirm" value="T">
<input type="hidden" name="showresults" value="F">
<input type="hidden" name="preventdupesmemberid" value="T">
<input type="hidden" name="preventdupesip" value="F">
<input type="hidden" name="numberquestions" value="F">
<input type="hidden" name="destinationurl" value="">
<input type="hidden" name="original_survey_id" value="62">
<!-- FORM END TAG --></form>
<!-- FOOTER START -->
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- END HEADER -->
</body>
</html>

原文

I'm required to use a limited survey application, and have to adapt the provided code to meet more advanced functionality.

I need to create a weighted ranking question, so users can select their top three choices and the data will go into the survey application and be accessible in the survey reports. The application only supports 2 types of questions (text fill & multiple choice) but I can alter the code, as long as it still sends the form data back to the survey application.

The code is set up so it will show a drop-down menu of 0-3 for each option. Now I want to limit the user's choices so they can only select one "1" "2" or "3", three choices total. Ideally, if the user already had "2" selected for one option and they tried to select it for another option, it would set the first "2" as "0" or blank.

Is this possible to do with javascript? If so, does anyone know of a site that might show code like this, or provide similar enough examples that I could adapt it?

Current code here:

<html>
<head><title>Survey</title></head>
<!-- Changes
- remove br to put dropdown next to text for each item.  Switch text & dropdown order    
for each item.
- add comments to separate each question
- removed blue title font
- add instructions

Goals
- limit choices to one 1 one 2 and one 3, three choices total.
-->
<link href="---" rel="stylesheet" type="text/css">
<body bgcolor="#3c76a3">

<!-- TRANSITIONAL DIALOG BOX -->
<table border="0" align="center" cellpadding="0" cellspacing="0" style="background-attachment: scroll; background-color: #3c76a3; background-repeat: no-repeat; background-position: left top;" bgcolor="#3c76a3" topmargin="0" marginwidth="0" marginheight="0" width="100%" height="100%">
<tr>
<td>
<table border="0" align="center" cellpadding="0" cellspacing="0" id="survey">
<tr>

<td><p> </p>

<!-- HEADER END -->
<!-- FORM START TAG --><form name="survey" action="---" method="POST">
<FONT face="Verdana, Arial, Helvetica, sans-serif">
<b>survey</b><hr>

<!-- 1 -->
<input type=hidden name="Buy R.J. a DeLorean_multiple_answers" value="one">
<font size=2><select name="Buy R.J. a DeLorean" SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Buy R.J. a DeLorean_help" value="">
<b><font size=2>Buy R.J. a DeLorean</font></b>
<hr size=1>

<!-- 2 -->
<input type=hidden name="Fill Lisa's office with marshmallows._multiple_answers"     value="one">
<font size=2><select name="Fill Lisa's office with marshmallows." SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Fill Lisa's office with marshmallows._help" value="">
<b><font size=2>Fill Lisa's office with marshmallows.</font></b>
<hr size=1>

<!-- 3 -->
<input type=hidden name="Install a beer fridge in everyone's filing     cabinets._multiple_answers" value="one">
<font size=2><select name="Install a beer fridge in everyone's filing cabinets." SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Install a beer fridge in everyone's filing cabinets._help" value="">
<b><font size=2>Install a beer fridge in everyone's filing cabinets.</font></b>
<hr size=1>

<!-- 4 -->
<input type=hidden name="Buy a company Cessna_multiple_answers" value="one">
<font size=2><select name="Buy a company Cessna" SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Buy a company Cessna_help" value="">
<b><font size=2>Buy a company Cessna</font></b><br>
<hr size=1>

<!-- 5 -->
<input type=hidden name="Replace Conf2's chairs with miniature ponies._multiple_answers" value="one">
<font size=2><select name="Replace Conf2's chairs with miniature ponies." SIZE=1>
<option value="">
<option value="0">0
<option value="1">1
<option value="2">2
<option value="3">3
</select></font>
<input type="hidden" name="Replace Conf2's chairs with miniature ponies._help" value="">
<b><font size=2>Replace Conf2's chairs with miniature ponies.</font></b>
<hr size=1>

<input type="hidden" name="question_names" value="{Buy R.J. a DeLorean} {Fill Lisa's office with marshmallows.} {Install a beer fridge in everyone's filing cabinets.} {Buy a company Cessna} {Replace Conf2's chairs with miniature ponies.}">
<p align="right"><input type="image" BORDER=0 title="Save Changes" alt="Save Changes" src="---"  name="button_save_changes">
<input type="hidden" name="showconfirm" value="T">
<input type="hidden" name="showresults" value="F">
<input type="hidden" name="preventdupesmemberid" value="T">
<input type="hidden" name="preventdupesip" value="F">
<input type="hidden" name="numberquestions" value="F">
<input type="hidden" name="destinationurl" value="">
<input type="hidden" name="original_survey_id" value="62">
<!-- FORM END TAG --></form>
<!-- FOOTER START -->
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- END HEADER -->
</body>
</html>

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_畞蕅 2024-09-07 11:37:18

警告：以下代码有问题。它不应该按原样插入到您的页面中。这是您可以应用的技术的说明。研究它并编写自己的解决方案。

一种选择是在做出选择时记录不可用的选项。

var choose = (function (maxCount) {
    var chosen = {};
    var count = 0;
    function unchoose(value) {
        if (chosen[value]) {
            delete chosen[value];
            --count;
        }
    }
    return function(option) {
        if (! chosen[option.value]) {
            // option isn't chosen elsewhere
            unchoose(option.prevValue);
            if (count < maxCount) {
                // haven't reached vote limit
                chosen[option.value] = true;
                option.prevValue = option.value;
                ++count;
                return true;
            }
        }
        if (option.prevValue) {
            option.value = option.prevValue;
        } else {
            option.value = "";
        }
        return false;
    }
})(3);

您可以重构并创建一个 Set 类，而不是单独的 count 和 chosen 变量，这会稍微简化 choice ：

function Set() {
    this.items = {};
    this.size=0;
}
Set.prototype.contains = function(item) {
    return this.items[item];
}
Set.prototype.add = function(item) {
    if (!this.contains(item)) {
        this.items[item] = true;
        ++this.size;
    }
}
Set.prototype.remove = function(item) {
    if (this.contains(item)) {
        delete this.items[item];
        --this.size;
    }
}

var choose = (function (maxCount) {
    var chosen = new Set;
    return function(option) {
        if (! chosen.contains(option.value)) {
            // option isn't chosen elsewhere
            chosen.remove(option.prevValue);
            if (chosen.size < maxCount) {
                // haven't reached vote limit
                chosen.add(option.value);
                option.prevValue = option.value;
                return true;
            }
        }
        // invalid choice; undo it
        if (option.prevValue) {
            option.value = option.prevValue;
        } else {
            option.value = "";
        }
        return false;
    }
})(3);

以下侦听器：

function choiceListener(evt) {
    if (! choose(evt.target)) {
        evt.preventDefault();
    }
}

将 choose 绑定到每个 select 的 onchange 属性（尽管在采用此方法之前请仔细考虑，因为内联事件订阅是有问题的），或者使用 DOM 事件并订阅您可以进行更多更改，考虑使用 jQuery 的 UI 交互（具体来说，UI/Draggable, UI/Droppable 和 UI/Sortable) 允许用户拖动放下他们想要投票的项目并按顺序排序。这提供了一个更加直观的界面。

Caveat: the following code has issues. It's not intended to be dropped-in, as-is to your page. It's an illustration of technique that you can apply. Study it and write your own solution.

One option would be to record unavailable options whenever a choice is made.

var choose = (function (maxCount) {
    var chosen = {};
    var count = 0;
    function unchoose(value) {
        if (chosen[value]) {
            delete chosen[value];
            --count;
        }
    }
    return function(option) {
        if (! chosen[option.value]) {
            // option isn't chosen elsewhere
            unchoose(option.prevValue);
            if (count < maxCount) {
                // haven't reached vote limit
                chosen[option.value] = true;
                option.prevValue = option.value;
                ++count;
                return true;
            }
        }
        if (option.prevValue) {
            option.value = option.prevValue;
        } else {
            option.value = "";
        }
        return false;
    }
})(3);

Instead of separate count and chosen variables, you could refactor and create a Set class, which simplifies choice a bit:

function Set() {
    this.items = {};
    this.size=0;
}
Set.prototype.contains = function(item) {
    return this.items[item];
}
Set.prototype.add = function(item) {
    if (!this.contains(item)) {
        this.items[item] = true;
        ++this.size;
    }
}
Set.prototype.remove = function(item) {
    if (this.contains(item)) {
        delete this.items[item];
        --this.size;
    }
}

var choose = (function (maxCount) {
    var chosen = new Set;
    return function(option) {
        if (! chosen.contains(option.value)) {
            // option isn't chosen elsewhere
            chosen.remove(option.prevValue);
            if (chosen.size < maxCount) {
                // haven't reached vote limit
                chosen.add(option.value);
                option.prevValue = option.value;
                return true;
            }
        }
        // invalid choice; undo it
        if (option.prevValue) {
            option.value = option.prevValue;
        } else {
            option.value = "";
        }
        return false;
    }
})(3);

Bind choose to each select's onchange attribute (though think hard before taking this approach, as inline event subscriptions are probelmatic), or use DOM events and subscribe the following listener:

function choiceListener(evt) {
    if (! choose(evt.target)) {
        evt.preventDefault();
    }
}

If you can make more changes, consider using something like jQuery's UI interactions (specifically, UI/Draggable, UI/Droppable and UI/Sortable) to allow the user to drag & drop the items they want to vote for and sort them in order. This provides a much more intuitive interface.