javascript - Dynamically change selectbox options based on previous option selection

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javascript - Dynamically change selectbox options based on previous option selection

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

javascript - Dynamically change selectbox options based on previous option selection

What I am trying to accomplish is the following... HTML

<!doctype html>
<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <link href="css/jquery.selectbox.css" type="text/css" rel="stylesheet" />
</head>
<body>



    <select name="dateselector_parent" id="dateselector_parent" tabindex="1">
        <option value="">--Select Date--</option>
        <option value="1">2012</option>
        <option value="1">2011</option>
        <option value="1">2010</option>
        <option value="2">Predefined Dates</option>
    </select>

    <select name="dateselector_child" id="dateselector_child" tabindex="2">
        <option value="">--Select Date--</option>
        <option value="1">January</option>
        <option value="1">February</option>
        <option value="1">March</option>
        <option value="1">April</option>
        <option value="1">May</option>
        <option value="1">June</option>
        <option value="1">July</option>
        <option value="1">August</option>
        <option value="1">September</option>
        <option value="1">October</option>
        <option value="1">November</option>
        <option value="1">December</option>
        <option value="2">Current Month</option>
        <option value="2">Month to Date</option>
        <option value="2">Last 7 Days</option>
    </select>


    <script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>
    <script type="text/javascript" src="js/jquery.selectbox-0.2.js"></script>
    <script type="text/javascript" src="js/datejs.js"></script>
    <script type="text/javascript">
    $(function () {
        $("#dateselector_parent").selectbox();
        $("#dateselector_child").selectbox();
    });


    </script>
</body>

This creates two select boxes, I want one box to display content according to what the user chooses on the other one. For example, if the user chooses, 2010 or 2011 or 2012, I want to display Jan-Dec as options on the second one. If the user chooses, Predefined Dates, I want to display Current Month, Month to Date, and Last 7 Days. The javascript plugin I'm using allows the user to define the onChange, onOpen, and onClose methods. I have been doing some research and it appears that AJAX is involved in trying to accomplish this, but since I don't know one bit of PHP I would like to know if it's possible to accomplish this with jQuery. (I have attempted to solve this problem with no luck of course, I am not looking for someone to do it for me, I just want to be pointed in the right direction, whether I can accomplish this with jQuery or if it's necessary to use AJAX since I haven't seen an example online with only jQuery).

Any help will be appreciated

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1 Answer

深蓝 · Answer 1 · 2021-10-23T21:33:55+0000

I hope the following work for your requirement. Having 3 child dropdowns (no divs) 1. --Select--, 2. Jan-Dec 3.Other options

$().ready(function () {

    var selectedOnLoad = $('#dateselector_parent').val();
    setChild(selectedOnLoad);

    $('#dateselector_parent').change(function () {
       var selectedValue = $('#dateselector_parent').val();
       setChild(selectedValue);
    });

});

function setChild(value){
    //Have your three child selector names as follows in your markup as well and assuming they are not in divs
    var arr = [ "dateselector_child_", "dateselector_child_1", "dateselector_child_2"];

    jQuery.each(arr, function() {
            if(this == "dateselector_child_" + value){
                $("#" + this).show();
            }else{
                $("#" + this).hide();
            }
     });
}

UPDATE: Adding markup for the above script

<select name="dateselector_parent" id="dateselector_parent" tabindex="1">
    <option value="">--Select Date--</option>
    <option value="1">2012</option>
    <option value="1">2011</option>
    <option value="1">2010</option>
    <option value="2">Predefined Dates</option>
</select>


<select name="dateselector_child_" id="dateselector_child_" tabindex="2">
    <option value="">--Select Date--</option>
</select>

<select name="dateselector_child_1" id="dateselector_child_1" tabindex="2">
    <option value="">--Select Date--</option>
    <option value="1">January</option>
    <option value="1">February</option>
    <option value="1">March</option>
    <option value="1">April</option>
    <option value="1">May</option>
    <option value="1">June</option>
    <option value="1">July</option>
    <option value="1">August</option>
    <option value="1">September</option>
    <option value="1">October</option>
    <option value="1">November</option>
    <option value="1">December</option>
</select>

<select name="dateselector_child_2" id="dateselector_child_2" tabindex="2">
    <option value="">--Select Date--</option>
    <option value="2">Current Month</option>
    <option value="2">Month to Date</option>
    <option value="2">Last 7 Days</option>
</select>

Check the setChild(value) function. Parent's selected value is passing to that function when page is ready (just after loading) and also when user change the selection. Parent's selected value could be "","1","2". Next the foreach loop finds the name of the child that needs to show and others are hidden. if user select ---Select--- option of the parent then that function will show "dateselector_child_" and others two hidden.

Hope it's clear now....

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javascript - Dynamically change selectbox options based on previous option selection

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