how to set scrolltop by javascript like jquery? - javascript

My html code:
<select class="sss" size="3">
<option value="1">value 1</option>
<option value="2">value 2</option>
<option value="3">value 3</option>
<option value="4">value 4</option>
<option value="5">value 5</option>
<option value="6">value 6</option>
<select>
and jquery code:
var $s = $('.sss');
var optionTop = $s.find('[value="3"]').offset().top;
var selectTop = $s.offset().top;
$s.scrollTop($s.scrollTop() + (optionTop - selectTop));
it is possible for me in jquery . (DEMO)
but I want to solve that in javascript. Is it possible?

I have solved that: following ans:
var s = document.getElementById("aa");
var optionTop = s.querySelector('option[value="2"]').offsetTop;
var selectTop = s.offsetTop;
s.scrollTop = s.scrollTop + (optionTop - selectTop);
<select id="aa" size="3">
<option value="1">value 1</option>
<option value="2">value 2</option>
<option value="3">value 3</option>
<option value="4">value 4</option>
<option value="5">value 5</option>
<option value="6">value 6</option>
<select>

Related

Show / Hide div if selected specific option value [closed]

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I need if selected number 1 or 2 or 7 the div id show but if the other number div hide
<select class="custom-select" id="selectEmployer">
<option selected>Vyberte</option>
<option value="1">Employer 1</option>
<option value="2">Employer 2</option>
<option value="3">Employer 3</option>
<option value="4">Employer 4</option>
<option value="5">Employer 5</option>
<option value="6">Employer 6</option>
<option value="7">Employer 7</option>
</select>
<div id="employer">SHOW</div>
You can do something like this:
$("#selectEmployer").change(function() {
$("#employer").hide();
if ($.inArray($(this).val(), ["1", "2", "7"]) > -1) {
$("#employer").show();
}
})
Demo
$("#selectEmployer").change(function() {
$("#employer").hide();
if ($.inArray($(this).val(), ["1", "2", "7"]) > -1) {
$("#employer").show();
}
})
#employer {
display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select class="custom-select" id="selectEmployer">
<option selected>Vyberte</option>
<option value="1">Employer 1</option>
<option value="2">Employer 2</option>
<option value="3">Employer 3</option>
<option value="4">Employer 4</option>
<option value="5">Employer 5</option>
<option value="6">Employer 6</option>
<option value="7">Employer 7</option>
</select>
<div id="employer">SHOW</div>
Vanilla javascript solution would be:
var selectElem = document.getElementById("selectEmployer");
var divElem = document.getElementById("employer");
var showFor = [1,2,7];
divElem.style = "display:none;"
selectElem.addEventListener('change', function(e) {
var selectValue = parseInt(e.target.value);
if (showFor.includes(selectValue)) {
divElem.style = "";
} else {
divElem.style = "display:none;"
}
});
<select class="custom-select" id="selectEmployer">
<option selected>Vyberte</option>
<option value="1">Employer 1</option>
<option value="2">Employer 2</option>
<option value="3">Employer 3</option>
<option value="4">Employer 4</option>
<option value="5">Employer 5</option>
<option value="6">Employer 6</option>
<option value="7">Employer 7</option>
</select>
<div id="employer">SHOW</div>
Here I hope this does what you need it to
https://stackblitz.com/edit/angular-dm1w3a
<select class="custom-select" id="selectEmployer" (ngModelChange)="checkChange($event)" [(ngModel)]="selectedValue">
<option selected>Vyberte</option>
<option value="1">Employer 1</option>
<option value="2">Employer 2</option>
<option value="3">Employer 3</option>
<option value="4">Employer 4</option>
<option value="5">Employer 5</option>
<option value="6">Employer 6</option>
<option value="7">Employer 7</option>
</select>
<div id="employer" *ngIf="selectedValue === '1' || selectedValue === '2' || selectedValue === '7'">SHOW</div>

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>

javascript function to remove null value

am trying to remove null value in listbox so first i tried with loop and then one guy helped to do this way but its not removing a null value and empty space...can some body
help out this problem by javascript..
<script type="text/javascript">
function change()
{
//document.getElementById("Geography").options[7]=new Option("", "newval", true, false);
var optionsArr = [];
optionsArr.push(document.getElementById("Geography").options);
optionsArr.push(document.getElementById("zone").options);
optionsArr.push(document.getElementById("country").options);
var optArrlenght = optionsArr.length;
for ( var j = 0; j < optArrlenght; j++){
var options = optionsArr[j];
var optionslength = options.length
for (var i = 0; i < optionslength; i++)
{
if (options[i].innerHTML == "Null Value" || options[i].innerHTML == "")
{
options.removeChild(options[i]);
// OR
// options.options[i] = null;
}
}
}
}
</script>
</head>
<body onload="change()">
Geography:<select id="Geography">
<option value="0"></option>
<option value="1">Null Value</option>
<option value="2">item 2</option>
<option value="3">item 3</option>
<option value="4">item 4</option>
<option value="0">All</option>
</select>
zone: <select id="zone" >
<option value="0"></option>
<option value="1">Null Value</option>
<option value="2">item 2</option>
<option value="3">item 3</option>
<option value="4">item 4</option>
<option value="0">All</option>
</select>
country:<select id="country" >
<option value="0"></option>
<option value="1">Null Value</option>
<option value="2">item 2</option>
<option value="3">item 3</option>
<option value="4">item 4</option>
<option value="0">All</option>
</select>
</body>
Hi whether u have found out solution or not still i put my answer here..
http://jsbin.com/awUWAMeN/2/edit
function change()
{
$('select').each(function() {
$(this).find('option:contains("Null Value")').remove();
});
}
This is not the proper way to remove a dom element: .removeChild() should be called on the elements parent. Instead of options.removeChild(options[i]);, try:
options[i].parentElement.removeChild(options[i]);
Also, if you want to remove the element from the array options call the following:
options.splice(i, 1);
You just need to make the following changes:
1.
<option value="0"></option>
<option value="Null Value">Null Value</option>
<option value="item 2">item 2</option>
<option value="item 3">item 3</option>
<option value="item 4">item 4</option>
<option value="All">All</option>
2.Inside Loop in function change you need to do following
if (options[i].value == "Null Value" )
{ options.removeChild(options[i]);}
if(options[i].innerHTML == "")
{ options.removeChild(options[i])}

Dropdown JavaScript onClick event not firing in Chrome/IE

This doesn't work in chrome and IE. I'm not so good at Javascripting so I don't know what to look for. So what can I do to make this work? I have searched here to find some solution, but no luck.
Javascript code:
function show(id) {
var element = document.getElementById(id);
element.style.display = "";
}
function hide(id) {
var element = document.getElementById(id);
element.style.display = "none";
}
function hideAll() {
hide('child1');
hide('child2');
hide('child3');
hide('child4');
hide('child5');
}
HTML code
<select name="parent" id="parent">
<option value="0" selected>Please choose</option>
<option value="1" onclick="hideAll(); show('child1');">Parent 1</option>
<option value="2" onclick="hideAll(); show('child2');">Parent 2</option>
<option value="3" onclick="hideAll(); show('child3');">Parent 3</option>
<option value="4" onclick="hideAll(); show('child4');">Parent 4</option>
<option value="5" onclick="hideAll(); show('child5');">Parent 5</option>
</select>
</p>
<select name="child1" id="child1" style="display:none">
<option value="1">Child1 - 1</option>
<option value="2">Child1 - 2</option>
<option value="3">Child1 - 3</option>
<option value="4">Child1 - 4</option>
<option value="5">Child1 - 5</option>
</select>
<select name="child2" id="child2" style="display:none">
<option value="1">Child2 - 1</option>
<option value="2">Child2 - 2</option>
<option value="3">Child2 - 3</option>
<option value="4">Child2 - 4</option>
<option value="5">Child2 - 5</option>
</select>
<select name="child3" id="child3" style="display:none">
<option value="1">Child3 - 1</option>
<option value="2">Child3 - 2</option>
<option value="3">Child3 - 3</option>
<option value="4">Child3 - 4</option>
<option value="5">Child3 - 5</option>
</select>
<select name="child4" id="child4" style="display:none">
<option value="1">Child4 - 1</option>
<option value="2">Child4 - 2</option>
<option value="3">Child4 - 3</option>
<option value="4">Child4 - 4</option>
<option value="5">Child4 - 5</option>
</select>
<select name="child5" id="child5" style="display:none">
<option value="1">Child5 - 1</option>
<option value="2">Child5 - 2</option>
<option value="3">Child5 - 3</option>
<option value="4">Child5 - 4</option>
<option value="5">Child5 - 5</option>
</select>
You need to use onchange instead of onclick
Here is a complete solution which does not care what the IDS are as long as the values of the parent select match the IDs of the selects to hide and show
demo
window.onload=function() {
document.getElementById("disc").onchange=function() {
hideAll(this);
var id = this.value;
if (id) show(id);
}
}
function show(id) {
var el = document.getElementById(id);
if (el) el.style.display = "block";
else alert("No such ID as "+id);
}
function hide(id) {
var el = document.getElementById(id);
el.style.display = "none";
}
function hideAll(sel) {
var allSels=document.getElementsByTagName("select");
for (var i=0;i<allSels.length;i++) {
if (allSels[i]!=sel) {
console.log(allSels[i].id)
allSels[i].style.display='none';
}
}
}
try this
<select name="parent" id="parent" onChange="showHide(this.id)">
function showHide(id)
{
hideAll();
var elementId = document.getElementById(id).value ;
document.getElementById("child"+elementId).style.display= "block";
}

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