Develop Reference

Having trouble with the next and previous buttons for Selection JQuery

I am trying to set a next and before button to act as an option switcher. When I click on the Next button twice I can no longer get the previous button to work and vice versa.
This is for switching the sources of my video according to the next and previous button clicking as well as selecting from the options list.
$(document).ready(function(){
$('video').attr('src',$("#test").val());
$("#test").change(function(){
$('video').attr('src',$(this).val());
});
});
$("#fieldPrev").click(function() {
$('#test option:selected').prev().attr('deselected','selected');
$('video').attr('src',$("#test").val());
$("#test").change(function(){
$('video').attr('src',$(this).val());
});
});
$('#fieldNext').click(function() {
$('#test option:selected').next().attr('selected','selected');
$('video').attr('src',$("#test").val());
$("#test").change(function(){
$('video').attr('src',$(this).val());
});
});
Expected that when I click the previous the previous option will display.
<div id="epBtn" style="display:none;">
<button id="fieldPrev">❮</button>
<button id="fieldNext">❯</button>
<select id="test">
<option value="">-- Select Episode --</option>
<option value="Season 1/ep1.mp4">EP 1</option>
<option value="Season 1/ep2.mp4">EP 2</option>
<option value="Season 1/ep3.mp4">EP 3</option>
<option value="Season 1/ep4.mp4">EP 4</option>
<option value="Season 1/ep5.mp4">EP 5</option>
<option value="Season 1/ep6.mp4">EP 6</option>
<option value="Season 1/ep7.mp4">EP 7</option>
<option value="Season 1/ep8.mp4">EP 8</option>
<option value="Season 1/ep9.mp4">EP 9</option>
<option value="Season 1/ep10.mp4">EP 10</option>
<option value="Season 1/ep11.mp4">EP 11</option>
<option value="Season 1/ep12.mp4">EP 12</option>
</select>

If select option value matches text in separate div, add disabled field

I'm using a select field on my site which reloads the page and then adds this to value to a separate div. I want to be able to disable this option if any of the divs have the same value as the option.
<select id="bayname" name="bayname">
<option value="">--Select Bay--</option>
<option value="1">Bay 1</option>
<option value="2">Bay 2</option>
<option value="3">Bay 3</option>
<option value="4">Bay 4</option>
<option value="5">Bay 5</option>
<option value="6">Bay 6</option>
<option value="7">Bay 7</option>
<option value="8">Bay 8</option>
<option value="9">Bay 9</option>
<option value="10">Bay 10</option>
<option value="11">Bay 11</option>
<option value="12">Bay 12</option>
<option value="13">Bay 13</option>
<option value="14">Bay 14</option>
<option value="15">Bay 15</option>
<option value="16">Bay 16</option>
<option value="17">Bay 17</option>
<option value="18">Bay 18</option>
<option value="19">Bay 19</option>
<option value="20">Bay 20</option>
<option value="21">Bay 21</option>
<option value="22">Bay 22</option>
<option value="23">Bay 23</option>
<option value="24">Bay 24</option>
<option value="25">Bay 25</option>
<option value="26">Bay 26</option>
<option value="27">Bay 27</option>
<option value="28">Bay 28</option>
<option value="29">Bay 29</option>
<option value="30">Bay 30</option>
</select>
For example if a user clicks on 'Bay 1' a div will be created like this:
<li id="1509013949" class="cart-select cart-mode-cart">
1
</li>
And then when the page reloads again, i want to create an if statement so if the value from the select is within one of the divs then it should add it as disabled.
I've had ago at doing this using the code below and i can't get it to print out in the console log.
var baynumberoption = $("#bayname option").val();
var baynumber = $(".cart-select a[href='#select']").text();
if (baynumber.indexOf(baynumberoption) >= 0) {
console.log("match found");
}

$("#bayname option") returns all of the options so I think you really want to use the following. Note if you don't want to rely on the inner text of the link, you can also add data attribute like data-id="1" to store the value which can be used like:
$("#bayname option").each(function() {
var val = $(this).val();
if ( $(".cart-select a[data-id=" + val + "]").length > 0 ) {
$(this).attr("disabled", "disabled");
}
});
Some of the syntax may be off but you get the idea.

Disable certain options in a drop down select

Need to disable option "5" & "6" when the option value "2" is selected. It should display all the options in the List_2 when option "1" is selected. How can I do that using jQuery or any other method.
if ($('option[value=2]').prop('selected', true)) {
$('option[value=5]').prop('disabled', true);
}
<HTML>
<body>
<select id= "List_1">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
</select>
<select id= "List_2">
<option value="4">Option 4</option>
<option value="5">Option 5</option>
<option value="6">Option 6</option>
</select>
</body>
</HTML>

Here you go with a solution https://jsfiddle.net/eurbvzk1/
var disabledDic = {
"1" : ["6"],
"2" : ["4", "5"],
"3" : []
}
$('select#list_1').on('change', function(){
$('select#list_2 option').each(function(){
$(this).removeAttr('disabled');
});
var disableOption = disabledDic[$(this).val()];
$.each( disableOption, function(i){
$('option[value="' + disableOption[i] + '"]').prop('disabled', 'disabled');
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="list_1">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 2</option>
</select>
<select id= "list_2">
<option value="4">Option 4</option>
<option value="5">Option 5</option>
<option value="6">Option 6</option>
</select>
Create a dictionary that will contain each first select option as key & value will be list of disabled options from second list.
Onchange method check the dictionary & loop through the disabled value.
Hope this will help you.

With plain JS:
document.getElementById('List_1').onchange = function() {
document.getElementById('List_2')[1].disabled = (document.getElementById('List_1').selectedIndex == 1);
document.getElementById('List_2')[2].disabled = (document.getElementById('List_1').selectedIndex == 1);
}
<select id="List_1">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
</select>
<select id="List_2">
<option value="4">Option 4</option>
<option value="5">Option 5</option>
<option value="6">Option 6</option>
</select>

Hiding the currently selected option

I am surrently having an issue using JQuery. I have 2 select fields.
<select id="cat" name="cat_id">
<option value="2">Cat 2</option>
<option value="3">Cat 3</option>
<option value="4">Cat 4</option>
</select>
<select id="subcat" name="subcat_id">
<option class="subcats cat_2" value="1">Subcat 1</option>
<option class="subcats cat_2" value="2">Subcat 2</option>
<option class="subcats cat_3" value="3">Subcat 3</option>
<option class="subcats cat_3" value="4">Subcat 4</option>
<option class="subcats cat_3" value="5">Subcat 5</option>
<option class="subcats cat_0" value="0">No subcats for this cat</option>
</select>
And here is my JavaScript code
<script type="text/javascript">
var curval = $("#cat").val();
$(".subcats").hide(0);
$(".cat_"+curval).show(0);
$("#cat").change(function(){
var cat = $(this).val();
$(".subcats").removeAttr("selected").hide(0);
if($(".cat_"+cat).length == 0){$(".cat_0").show(0);}
else{$(".cat_"+cat).show(0);}
});
</script>
Here is the problem. When I change the value of the cats select, the options for the subcats are changed correctly. However, the currently selected field is still showing (Even if it doesn't correspond to the current cat).
Any help would be greatly appreciated.

You should change your code a little bit so on the hange event it can add the selected attribute to the first element in the available options :)
var curval = $("#cat").val();
$(".subcats").hide(0);
$(".cat_" + curval).show(0);
$("#cat").change(function() {
var cat = $(this).val();
$(".subcats").removeAttr("selected").hide(0);
if ($(".cat_" + cat).length == 0) {
$(".cat_0").attr("selected", "selected").show(0);
} else {
$(".cat_" + cat).eq(0).attr("selected", "selected");
$(".cat_" + cat).show(0);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<select id="cat" name="cat_id">
<option value="2">Cat 2</option>
<option value="3">Cat 3</option>
<option value="4">Cat 4</option>
</select>
<select id="subcat" name="subcat_id">
<option class="subcats cat_2" value="1">Subcat 1</option>
<option class="subcats cat_2" value="2">Subcat 2</option>
<option class="subcats cat_3" value="3">Subcat 3</option>
<option class="subcats cat_3" value="4">Subcat 4</option>
<option class="subcats cat_3" value="5">Subcat 5</option>
<option class="subcats cat_0" value="0">No subcats for this cat</option>
</select>

How to redirect user when clicking an option in a select list?

I'm kicking my self for not being able to do this. But I've tried almost everything. I simply want to redirect a user to a specific page when they click an option in my option value list. Here's my current code (which should explain my question better):
<select name="test_redirect">
<option value="1" onclick="document.location = 'http://localhost/shop?item=1';">Item 1</option>
<option value="2" onclick="document.location = 'http://localhost/shop?item=2';">Item 2</option>
<option value="3" onclick="document.location = 'http://localhost/shop?item=3';">Item 3</option>
</select>
I've also tried onChange as well. Same result. Can some one please help me with this? Thank you guys.

document.querySelectorAll("[name=test_redirect]")[0].addEventListener('change',
function () {
window.location = "http://localhost/shop?item=" + this.value;
});
This depends on a relatively new browser (with querySelectorAll and addEventListener), but the principle's the same. click doesn't get triggered on options, so you have to go with change on the <select>. Might as well consolidate the code a bit too.
http://jsfiddle.net/5n5ZE/

<select id="test_redirect">
<option value="1">Item 1</option>
<option value="2">Item 2</option>
<option value="3">Item 3</option>
</select>
javascript
var val = document.getElementById("test_redirect").value;
window.location.href = "http://localhost/shop?item=" + val;
jquery
$("#test_redirect").change(function(){
var val = $(this).val();
window.location.href = "http://localhost/shop?item=" + val;
});

try this (give the link of the page in value of each option)
<select name="test_redirect" onchange="window.location.href=this.form.test_redirect.options[this.form.test_redirect.selectedIndex].value">

You need to bind the event handler to the <select> and not the individual options:
<select name="test_redirect" onchange="location.assign('http://localhost/shop?item=' + this.options[this.selectedIndex].value)">
<option value="1">Item 1</option>
<option value="2">Item 2</option>
<option value="3">Item 3</option>
</select>

This will save you lines :
<select onchange="location = this.options[this.selectedIndex].value;">
<option value="1">Item 1</option>
<option value="2">Item 2</option>
<option value="3">Item 3</option>
</select>

try this
<select name="test_redirect" onchange="location.href='http://localhost/shop?item='+this.value">
<option value="1">Item 1</option>
<option value="2">Item 2</option>
<option value="3">Item 3</option>
</select>