Develop Reference

Conditional list options based on previous selection

So I am a newbie on Wordpress working with a theme to make a car platform. Unfortunately, on the theme, the car-selling functionalities differ from what we need. One of those things is: show or hide options based on previous selection with dropdown lists.
Quick example: If 'BMW' is chosen on 'Make', then only show '1 series' '3 series' '5 series' on 'Model', if '3 series is chosen, then only show 318i 320i 330i on 'Engine', aso. From a logical point of view, it is so easy, but I have no clue how to translate this into code. Luckily, I've found pretty good code here already, but this works only for the next dropdown list. My question is, how does the javascript/jquery code have to look like so you can make more than 2 conditional dropdown lists? You could take Engine as an example. Thank you
HTML code:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label for="req_make">Make</label>
<select id="req_make" name="make">
<option disabled="disabled" selected="selected" value="">Choose Make</option>
<option class="BMW" value="BMW">BMW</option>
<option class="Audi" value="Audi">Audi</option>
<option class="VW" value="VW">VW</option>
</select>
<label for="req_model">Model</label>
<select id="req_model" name="model">
<option disabled="disabled" selected="selected" value="">Choose model</option>
<option class="BMW" value="1er">1er</option>
<option class="BMW" value="3er">3er</option>
<option class="BMW" value="5er">5er</option>
<option class="BMW" value="7er">7er</option>
<option class="Audi" value="A4">A4</option>
<option class="Audi" value="A8">A8</option>
<option class="Audi" value="Q7">Q7</option>
<option class="VW" value="Golf">Golf</option>
<option class="VW" value="Touran">Touran</option>
</select>
<label for="req_engine">Engine</label>
<select id="req_engine" name="engine">
<option disabled="disabled" selected="selected" value="">Choose engine</option>
<option class="BMW" value="7er">7er - 730i</option>
<option class="BMW" value="7er">7er - 730Li</option>
<option class="BMW" value="7er">7er - 735i</option>
</select>
Javascript code:
$(function(){
$("#req_make").on("change",function(){
var levelClass = $('#req_make').find('option:selected').attr('class');
console.log(levelClass);
$('#req_model option').each(function () {
var self = $(this);
if (self.hasClass(levelClass) || typeof(levelClass) == "undefined") {
self.show();
} else {
self.hide();
}
});
});
});

You can specify any number of selectors to combine into a single result. So change $('#req_model option').each(function () { ... to $('#req_model option, #req_engine option').each(function () { ... to solve this.

I just did it on my own. It is working, but of course I don't know if it's the right way to do it. I am taking the value of the former list and assigning it to the class of the next, while changing attr('class') to attr('value'). https://jsfiddle.net/agdkw1xm/

select option using jquery fails?

Here iam trying to get values based on #category selection when i select a category men or women,following select option should show the relevant options.what i did satisfied my requirement but when i try to access it using keyboard(down arrow) it shows all the options of the #subcategory.here is the code and fiddle.any help is thankful.
my fiddle http://jsfiddle.net/JUGWU/
HTML:
<select id="category" name="category">
<option>-select-</option>
<option value="MEN" id="menu1">MEN</option>
<option value="WOMEN" id="menu2">WOMEN</option>
</select>
<br>
<select id="subcategory">
<option></option>
<option id="Clothing" value="Clothing">Clothing</option>
<option id="Accessories" value="Accessories">Accessories</option>
<option id="Footwear" value="Footwear">Footwear</option>
<option id="Watches" value="Watches">Watches</option>
<option id="Sunglasses" value="Sunglasses">Sunglasses</option>
<option id="Bags" value="Bags">Bags</option>
</select>
Jquery:
$(document).ready(function(){
$("#category").change(function() {
var xyz = $("option:selected").attr("id");
alert(xyz);
if(xyz === "menu1"){
$("#subcategory option").hide();
$("#Clothing,#Footwear").show();
}
});
});

Try this in your conditional. The disabled property doesn't allow keyboard selection. Seems to work for me.
$("#subcategory option").prop('disabled', true).hide();
$("#Clothing,#Footwear").prop('disabled', false).show();
Also, your logic breaks if a user switches from men to women.

This answer is not exactly addressing your problem (using keyboard(down arrow)) but I think it is IMHO a better way to do what you want. And also I used the fixed part from #user2301903 answer, just to make my point. my main point here was using the markup attributes.
We can use our markup attributes to have less complexity, I changed your markup like this (added a catg attribute):
<select id="category" name="category">
<option>-select-</option>
<option value="MEN" id="menu1" catg="m">MEN</option>
<option value="WOMEN" id="menu2" catg="w">WOMEN</option>
</select>
<br>
<select id="subcategory">
<option></option>
<option id="Clothing" value="Clothing" catg="m">Clothing</option>
<option id="Accessories" value="Accessories" catg="w">Accessories</option>
<option id="Footwear" value="Footwear" catg="m">Footwear</option>
<option id="Watches" value="Watches" catg="w">Watches</option>
<option id="Sunglasses" value="Sunglasses" catg="w">Sunglasses</option>
<option id="Bags" value="Bags" catg="w">Bags</option>
</select>
and your code like this:
$(document).ready(function () {
$("#category").change(function () {
var catg = $("option:selected").attr("catg");
//from #user2301903 answer
$("#subcategory option").prop('disabled', true).hide();
$("option[catg=" + catg + "]").prop('disabled', false).show();
});
});
and this is your working DEMO;
and this one is another way of doing what you want which works even in IE: IE_DEMO

Change fieldset via radio button

I have a form with 2 radio buttons and when either button is toggled it shows or hides a certain fieldset. The issue I have is because the fieldset is just hidden so when the form is submitted it still takes the first fieldsets values.
I have setup a fiddle to show how the form changes the fieldsets http://jsfiddle.net/hhdMq/1/
So when I select "Scale B" although you can change the correct values, when the form is submitted it takes the default values of Scale A.
<center>
<input type="radio" name="sellorlet" value="Yes" id="rdYes" checked="yes" />
<label for="rdYes">Scale A</label>
<input type="radio" name="sellorlet" value="No" id="rdNo" />
<label for="rdNo">Scale B</label>
</center>
<fieldset id="sell">
<center>
<select id="pricemin" name="min">
<option value="50000">Min Price</option>
<option value="50000">£50,000</option>
<option value="100000">£100,000</option>
<option value="200000">£200,000</option>
<option value="300000">£300,000</option>
<option value="400000">£400,000</option>
<option value="500000">£500,000</option>
<option value="600000">£600,000</option>
<option value="700000">£700,000</option>
<option value="800000">£800,000</option>
<option value="900000">£900,000</option>
<option value="1000000">£1,000,000</option>
<option value="1250000">£1,250,000</option>
<option value="1500000">£1,500,000</option>
<option value="1750000">£1,750,000</option>
<option value="2000000">£2,000,000</option>
<option value="3000000">£3,000,000</option>
</select>
<select id="pricemax" name="max">
<option value="5000000">Max Price</option>
<option value="100000">£100,000</option>
<option value="200000">£200,000</option>
<option value="300000">£300,000</option>
<option value="400000">£400,000</option>
<option value="500000">£500,000</option>
<option value="600000">£600,000</option>
<option value="700000">£700,000</option>
<option value="800000">£800,000</option>
<option value="900000">£900,000</option>
<option value="1000000">£1,000,000</option>
<option value="1250000">£1,250,000</option>
<option value="1500000">£1,500,000</option>
<option value="1750000">£1,750,000</option>
<option value="2000000">£2,000,000</option>
<option value="3000000">£3,000,000</option>
<option value="4000000">£4,000,000</option>
<option value="5000000">£5,000,000</option>
</select>
</center>
</fieldset>
<fieldset id="buy" style="display:none;">
<center>
<select id="lpricemin" name="min">
<option value="500">Min Price</option>
<option value="500">£500</option>
<option value="600">£600</option>
<option value="700">£700</option>
<option value="800">£800</option>
<option value="900">£900</option>
<option value="1000">£1000</option>
<option value="1150">£1150</option>
<option value="1250">£1250</option>
<option value="1500">£1500</option>
<option value="2000">£2000</option>
<option value="2500">£2500</option>
<option value="3000">£3000</option>
<option value="4000">£4000</option>
<option value="5000">£5000</option>
</select>
<select id="lpricemax" name="max">
<option value="5000">Max Price</option>
<option value="600">£600</option>
<option value="700">£700</option>
<option value="800">£800</option>
<option value="900">£900</option>
<option value="1000">£1000</option>
<option value="1150">£1150</option>
<option value="1250">£1250</option>
<option value="1500">£1500</option>
<option value="2000">£2000</option>
<option value="2500">£2500</option>
<option value="3000">£3000</option>
<option value="4000">£4000</option>
<option value="5000">£5000</option>
</select>
</center>
</fieldset>
and the jquery used:
$("input[name='sellorlet']").change(function () {
$("#sell").toggle(this.value == "Yes");
$("#let").toggle(this.value == "No");
});
My question is, how can I completely disable the first fieldset if Scale B is selected and likewise when Scale A is selected it will disable the second fieldset?
Many thanks

When submitting a form, you cannot have two inputs, selects, or textareas with the same name in the same form. Doing so will cause confusion and probably end up the wrong info being submitted. There are two ways you can fix this.
Method 1:
Change the
<select id="lpricemin" name="min">
<select id="lpricemin" name="lmin">
to
<select id="lpricemax" name="max">
<select id="lpricemax" name="lmax"> respectively.
This will allow you to handle the data from lmin and lmax and ensure you get the info from the second fieldset.
Method 2:
Put the second fieldset in a different form. Then just change the jQuery to show the forms instead of the fieldsets.

Changed the radio buttons now to a tabbed design so the form can be separated correctly. If anyone would like to know how the tabs are done they are here http://cssdeck.com/labs/fancy-tabbed-navigation-with-css3-and-jquery

Method 3 would be to change the switch the content of your select through Javascript rather than toggling through visibility. You can do that through:
function setMaxScale()
{
document.getElementById().innerHTML = "<option value="50000">Min Price</option>\
<option value="50000">£50,000</option>\
<option value="100000">£100,000</option>\
<option value="200000">£200,000</option>\
<option value="300000">£300,000</option>...";
}
An other clean solution would be to create your scales dynamically with a loop.

jquery form only passing first select box values on submit

I'm new posting here, have visited several times over the years to read every ones ideas.
My issue is I have a form with 2 select boxes, second one populated with values upon selection in the first. The second holds a url value which you got to upon submit.
This function works perfectly using the onchange but on submit only the first of the second select list urls work. I can swap them but only the first works, all the others only pass the primary url followed by a crosshatch '#'.
<script>
$(document).ready(function($){
$("#category").change(function() {
$('select[name="product"]').removeAttr("name").hide();
$("#" + $(this).val()).show().attr("name", "product");
});
/* ' This works on all
$(".product").change(function() {
document.location = $(this).val();
});
*/
/* this only passes url on first product option list else passes opening url + #*/
$('#discover').submit(function() {
document.location = $(".product").val();
return false;
});
});
</script>
<div id="discover-box">
<form id="discover" method="post">
<fieldset>
<p class="category">
<label class="title">Category:</label>
<select id="category" name="category">
<option value="#" selected="selected">Choose category</option>
<option value="accommodation">Accommodation</option>
<option value="food">Food</option>
<option value="explore">Explore</option>
</select>
<p><label>Sub-Category:</label>
<select id="accommodation" name="product" class="product">
<option value="#" selected="selected">Choose sub-category</option>
<option value="accommodation_category.asp?o=1&c=1">Motels</option>
<option value="accommodation_category.asp?o=2&c=2">Camping, Caravan & Holiday Parks</option>
<option value="accommodation_category.asp?o=3&c=3">B&B, Self-Contained Houses & Cottages</option>
<option value="accommodation_category.asp?o=4&c=4">Hotels</option>
<option value="accommodation_category.asp?o=5&c=5">Backpackers & Group Accommodation</option>
<option value="accommodation_category.asp?o=6&c=6">National Parks</option>
</select>
<select id="food" style="display:none" name="product" class="product">
<option value="#" selected="selected">Choose sub-category</option>
<option value="food_wine_category.asp?o=1&t=1&c=1">Restaurants & Cafes</option>
<option value="food_wine_category.asp?o=2&t=1&c=2">Pubs</option>
<option value="food_wine_category.asp?o=3&t=1&c=3">Bakeries & Takeaway</option>
<option value="food_wine_category.asp?o=4&t=1&c=4">Local Produce</option>
<option value="food_wine_category.asp?o=5&t=2&c=1">Mount Gambier Wine Region</option>
<option value="food_wine_category.asp?o=5&t=2&c=2">Other Limestone Coast Wine Regions</option>
</select>
<select id="explore" style="display:none" name="product" class="product">
<option value="#" selected="selected">Choose sub-category</option>
<option value="explore_category.asp?o=1">Top 10</option>
<option value="explore_category.asp?o=2">Arts, Crafts, Galleries & Museums</option>
<option value="explore_category.asp?o=3">Heritage, Antiques & Collectables</option>
<option value="explore_category.asp?o=4">Family Fun</option>
<option value="explore_category.asp?o=5">Caves & Sinkholes</option>
<option value="explore_category.asp?o=6">Parks & Gardens</option>
<option value="explore_category.asp?o=7">Walks & Drives</option>
<option value="explore_category.asp?o=8">Kanawinka Geotrail</option>
<option value="explore_category.asp?o=9">Retail</option>
<option value="explore_category.asp?o=10">Recreation, Leisure & Adventure</option>
</select>
</p>
<p class="buttons">
<input type="image" src="images/submit-red.png" Value="submit">
</p>
</fieldset>
</form>
</div>

because $(".product").val(); will find first occurrence of DOM having class product so in any case it will fetch first one... u can do this using
$('#discover').submit(function() {
document.location = $('select[name="product"]').val();
return false;
});

Open Fiddler (fiddler2.com) and watch the post go past. I find that generally when more than one control on a page uses the same name, the browser actually passes all of them, but the server-side framework expecting each post parameter to be unique, ignores all but the last one.

when you submit , you have only one select box with attribute name ,so you can select the selected value by that attribute
$('#discover').submit(function() {
document.location = $('select[name="product"]').val();
return false;
});

Update text in single textfield with multiple drop down boxes with javascript client side

EDIT: Ok, I really want to get this so I've decided to simplify what I need. I have one textbox that onclick updates a textfield. Now, what I need it to do is when they click on a second dropdown it will update a portion of text in the same textfield. Hope this helps.
<script type="text/javascript"><!--
function OnSelectionChanged(listBox) {
var textInput = document.getElementById("dn");
textInput.value = listBox.value;
}
//--></script>
</head>
<body>
<ul id="menu">
</ul>
<div id="main" class="view">
<h1>Text</h1>
<div id="intro"><h5>Text</h5>
<div id="content"><h2>Text:</h2>
<p>Text</p>
</div>
<form method="POST" action="submit" name="myForm"><fieldset>
<legend>Text</legend>
<label>[?]
Disposition Code<br />
<select size="1" name="disposition" id="drp_dwn" onchange="OnSelectionChanged (this)">
<option value="-1" selected>——Select one——</option>
<option value="Text ">190</option>
<option value="191">191</option>
<option value="192">192</option>
<option value="195">195</option>
<option value="270">270</option>
<option value="300">300</option>
<option value="340">340</option>
<option value="350">350</option>
<option value="370">370</option>
<option value="380">380</option>
<option value="381">381</option>
<option value="382">382</option>
<option value="383">383</option>
<option value="384">384</option>
<option value="400">400</option>
<option value="401">401</option>
<option value="402">402</option>
<option value="403">403</option>
</select>
</label>
<label>[?]
Cause Code<br />
<select size="1" name="cause">
<option value="-1" selected>——Select one——</option>
<option value="">Cause - 190</option>
<option value="B">Option B</option>
<option value="C">Option C</option>
</select>
</label><br /><br />
<label><!--[?] -->
Disposition Narrative
<textarea id="dn" rows="8" cols="30" name="dn"></textarea>
</label>
Im still getting used to how stack overflow wants us to format the code but hopefully you guys can read it well enough to help find a solution. Thanks again.

All I can really give you at this point is
Attach onchange handlers to your drop downs. Your handlers will
add/replace the text.
Use regular expressions to replace text when dd2 and dd3 change.
If you can provide more details about the text you want to replace then someone will be able to help you with your regular expressions.