Develop Reference

How can I hide search results until I've entered text?

Basically, this code makes it so that all results show and get trimmed down when you search for something specific. I want to hide all results before I've started writing and when I've entered at least one letter results show up again. I've been stuck at that exact problem for hours and have concluded with nothing.
I'd really appreciate the help.
function Function() {
var input, filter, ul, li, a, i, txtValue;
input = document.getElementById('Input');
filter = input.value.toUpperCase();
ul = document.getElementById("UL");
li = ul.getElementsByTagName('li');
for (i = 0; i < li.length; i++) {
a = li[i].getElementsByTagName("a")[0];
txtValue = a.textContent || a.innerText;
if (txtValue.toUpperCase().indexOf(filter) > -1) {
li[i].style.display = "";
} else {
li[i].style.display = "none";
}
}
}
#Input {
background-image: url('/css/searchicon.png');
background-position: 10px 12px;
background-repeat: no-repeat;
width: 30%;
font-size: 16px;
padding: 12px 20px 12px 40px;
border: 1px solid #ddd;
justify-content: center;
height: 20px;
}
#media screen and (max-width: 600px) {
#Input {
width: 80%;
margin-top: 4px;
}
}
;
#UL {
list-style-type: none;
padding: 0;
margin: 0;
}
#UL li a {
border: 1px solid #ddd;
margin-top: -1px;
background-color: #f6f6f6;
padding: 12px;
width: 30%;
text-decoration: none;
font-size: 18px;
color: black;
display: block;
}
#UL li a:hover:not(.header) {
background-color: #eee;
}
<input type="text" id="Input" onkeyup="Function()" placeholder="Search...">
<ul id="UL" style="list-style: none;">
<li class="listClass">SONY a6000</li>
<li class="listClass">SONY a6400</li>
<li class="listClass">SONY a7 IV</li>
<li class="listClass">Canon EOS RP</li>
<li class="listClass">Nikon D3500</li>
<li class="listClass">Hasselblad X1D II 50C</li>
</ul>

Given your html structure you can do this in one line of css:
#Input:focus:placeholder-shown + ul {
display:none;
}
It works because you have placeholder text on your input element, and the <ul> is adjacent to it. Read more here:
https://developer.mozilla.org/en-US/docs/Web/CSS/:placeholder-shown
https://developer.mozilla.org/en-US/docs/Web/CSS/Adjacent_sibling_combinator

If I understand correctly, Initially all the results will be shown? Then when you start typing they will be hidden(not entered any letter) and after entering atleast one element they start showing again? In that case you can use onfocus event along with onkeyup event.
function Function() {
let input, filter, ul, li, a, i, txtValue;
input = document.getElementById('Input');
filter = input.value.toUpperCase();
ul = document.getElementById("UL");
li = ul.getElementsByTagName('li');
for (i = 0; i < li.length; i++) {
a = li[i].getElementsByTagName("a")[0];
txtValue = a.textContent || a.innerText;
if (txtValue.toUpperCase().indexOf(filter) > -1 && filter!=='') {
li[i].style.display = "";
} else {
li[i].style.display = "none";
}
}
}
#Input {
background-image: url('/css/searchicon.png');
background-position: 10px 12px;
background-repeat: no-repeat;
width: 30%;
font-size: 16px;
padding: 12px 20px 12px 40px;
border: 1px solid #ddd;
justify-content: center;
height: 20px;
}
#media screen and (max-width: 600px) {
#Input {
width: 80%;
margin-top: 4px;
}
}
;
#UL {
list-style-type: none;
padding: 0;
margin: 0;
}
#UL li a {
border: 1px solid #ddd;
margin-top: -1px;
background-color: #f6f6f6;
padding: 12px;
width: 30%;
text-decoration: none;
font-size: 18px;
color: black;
display: block;
}
#UL li a:hover:not(.header) {
background-color: #eee;
}
<input type="text" id="Input" onkeyup="Function()" onfocus="Function()" placeholder="Search...">
<ul id="UL" style="list-style: none;">
<li class="listClass">SONY a6000</li>
<li class="listClass">SONY a6400</li>
<li class="listClass">SONY a7 IV</li>
<li class="listClass">Canon EOS RP</li>
<li class="listClass">Nikon D3500</li>
<li class="listClass">Hasselblad X1D II 50C</li>
</ul>
If you want to show all the results again when unfocusing the input field (and not any letter in the input field) then you can use onblur event to achieve that as well by modifying input field like below and add the function.
function Function2()
{
let input, filter, ul, li, a, i, txtValue;
input = document.getElementById('Input');
filter = input.value.toUpperCase();
ul = document.getElementById("UL");
li = ul.getElementsByTagName('li');
for (i = 0; i < li.length; i++) {
a = li[i].getElementsByTagName("a")[0];
txtValue = a.textContent || a.innerText;
if (txtValue.toUpperCase().indexOf(filter) > -1) {
li[i].style.display = "";
} else {
li[i].style.display = "none";
}
}
}
<input type="text" id="Input" onkeyup="Function()" onfocus="Function()" onblur="Function2()" placeholder="Search...">

Searchable drop down

I have a list of items in a drop down which is filterable using a search within the dropdown.
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Please select</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" placeholder="Search.." id="myInput" onkeyup="filterFunction()">
Abyssinian
American Bobtail
Amercian Curl
</div>
</div>
And the js...
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
function filterFunction() {
var input, filter, ul, li, a, i;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
div = document.getElementById("myDropdown");
a = div.getElementsByTagName("a");
for (i = 0; i < a.length; i++) {
txtValue = a[i].textContent || a[i].innerText;
if (txtValue.toUpperCase().indexOf(filter) > -1) {
a[i].style.display = "";
} else {
a[i].style.display = "none";
}
}
}
https://codepen.io/RSA_James/pen/LYZqYym
What I'm after is a way of showing a message if a user starts searching for something and there's no matches.
Any help appreciated! Thanks

ES6 shrinks the code a bit:
function filterFunction(sText) {
[...document.querySelectorAll('#myDropdown a')].forEach(elA => elA.classList.toggle('hide', !new RegExp(sText, 'gi').test(elA.textContent)));
document.querySelector('#myDropdown span.err').classList.toggle('hide', document.querySelectorAll('#myDropdown a:not(.hide)').length);
}
.hide { display: none; } .err { color: red; }
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Please select</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" placeholder="Search.." id="myInput" oninput="filterFunction(this.value)">
Abyssinian
American Bobtail
Amercian Curl
<span class="err hide">Nothing found</span>
</div>
</div>

Have a look here, added some new code and created a new element when there is no found result.
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
function filterFunction() {
var input, filter, ul, li, a, i;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
div = document.getElementById("myDropdown");
a = div.getElementsByTagName("a");
var empty = document.createElement("a");
empty.classList.add("empty");
empty.innerHTML="No Reault Found...";
var emptyVisiable= true;
for (i = 0; i < a.length; i++) {
txtValue = a[i].textContent || a[i].innerText;
if (txtValue.toUpperCase().indexOf(filter) > -1) {
a[i].style.display = "";
emptyVisiable = false;
} else {
a[i].style.display = "none";
}
}
if (emptyVisiable)
div.appendChild(empty);
else {
empty= div.querySelector(".empty")
if (empty!== null)
empty.remove();
}
}
.dropbtn {
background-color: #e3e3e3;
background-image: url('https://image.flaticon.com/icons/png/512/25/25243.png');
background-position: 270px center;
background-repeat: no-repeat;
background-size: 5%;
color: #333 ;
border: 1px solid red;
border-radius: 5px;
min-width: 300px;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
text-align: left;
}
.dropbtn:hover, .dropbtn:focus {
background-color: #d3d3d3;
}
#myInput {
box-sizing: border-box;
background-image: url('https://www.w3schools.com/howto/searchicon.png');
background-position: 14px 12px;
background-repeat: no-repeat;
font-size: 16px;
padding: 14px 20px 12px 45px;
border: none;
border-bottom: 1px solid #ddd;
width: 100%;
}
#myInput:focus {outline: 3px solid #ddd;}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f6f6f6;
min-width: 230px;
width: 100%;
max-height: 260px;
overflow: auto;
border: 1px solid #ddd;
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown a:hover {background-color: #ddd;}
.show {display: block;}
<h2>Search/Filter Dropdown</h2>
<p>Click on the button to open the dropdown menu, and use the input field to search for a specific dropdown link.</p>
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Please select</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" placeholder="Search.." id="myInput" onkeyup="filterFunction()">
Abyssinian
American Bobtail
Amercian Curl
American Longhair
American Shorthair
American Wirehair
Angora
Asian
Asian Blue
Balinese
Bengal
Bengal Tiger
Bicolour
Bicolour Longhair
British Bicolour Shorthair
Birman
Black
Black and White
Black and White Longhair
Black and White Shorthair
Black Longhair
Black Shorthair British Black
</div>
</div>

you can accomplish this by adding a p tag for the error in the html and a counter that increments each time no res is found in the loop of your filter function followed by an if at the end that checks to see if the counter === the lengths of links
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
function filterFunction() {
var input, filter, ul, li, a, i;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
div = document.getElementById("myDropdown");
a = div.getElementsByTagName("a");
let count = 0;
for (i = 0; i < a.length; i++) {
txtValue = a[i].textContent || a[i].innerText;
if (txtValue.toUpperCase().indexOf(filter) > -1) {
a[i].style.display = "";
} else {
count++;
a[i].style.display = "none";
}
}
if(count == a.length )
displayNoResults(filter);
}
function displayNoResults(searchTxt) {
let noResFound = document.getElementById("noResFound");
noResFound.style.display = "block"
noResFound.innerHTML = `No results for "${searchTxt}" were found`
}
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Please select</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" placeholder="Search.." id="myInput" onkeyup="filterFunction()">
<p id="noResFound"></p>
Abyssinian
American Bobtail
Amercian Curl
</div>
</div>

Search bar is only searching on first p tag

I am trying to implement a search bar into my webb application using .net core MVC.
I have found some code online but the problem is it will only search depending on the first p-tag.
Can't quite figure it out how to make it search through all p-tags before setting the display to none.
This is my JS function:
function myFunction() {
var input, filter, ul, li, p, i, txtValue;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
ul = document.getElementById("myUL");
li = ul.getElementsByTagName("li");
for (i = 0; i < li.length; i++) {
p = li[i].getElementsByTagName("p")[0];
txtValue = p.textContent || p.innerText;
if (txtValue.toUpperCase().indexOf(filter) > -1) {
li[i].style.display = "";
} else {
li[i].style.display = "none";
}
}
}
This is my cshtml:
<ul id="myUL" style="display: inline;
list-style: none;">
#await foreach (var logopedist in Model)
{
<li class="lijst" style="margin-top: 10px;
padding-left: 10px;
background-color: #1d71b8;
color: #ffffff;
font-size: 10pt;
padding-right: 10px;
padding-bottom: 5px;
padding-top: 5px;">
<p style="font-size:14px; font-weight:bold;">#logopedist.Naam, #logopedist.PraktijkNaam</p>
<p>#logopedist.Adres</p>
<p>#logopedist.Email</p>
<p>#logopedist.Mobiel</p>
</li>
}

I suggest this version
window.addEventListener("load", function() {
document.getElementById("myInput").addEventListener("input", function() {
const filter = this.value.toUpperCase();
[...document.querySelectorAll("#myUL li")].forEach(li => {
const txtValue = (li.textContent || li.innerText).toUpperCase();
li.classList.toggle("hide",txtValue.indexOf(filter) === -1)
});
})
})
#myUL {
display: inline;
list-style: none;
}
#myUL li {
margin-top: 10px;
padding-left: 10px;
background-color: #1d71b8;
color: #ffffff;
font-size: 10pt;
padding-right: 10px;
padding-bottom: 5px;
padding-top: 5px;
}
.lijst p {
font-size: 14px;
font-weight: bold;
}
.hide { display:none }
<input id="myInput" />
<ul id="myUL" style="">
<li class="lijst">
<p>NaamA PraktijkB</p>
<p>AdresA</p>
<p>logopedistA#Email.com</p>
<p>0612345678</p>
</li>
<li class="lijst">
<p>NaamC PraktijkD</p>
<p>AdresC</p>
<p>logopedistB#Email.com</p>
<p>0687654321</p>
</li>

Not able to enter values in second textbox

I have created a searchbox and I have made it absolute and added one more text box on the bottom , I am unable to click and enter the value in the text box.
Note: Position must be the same, Click for the Second Text box is not working
Here is the jsFiddle Link
Here is the code snippet
var placeArr = ["Adele","Agnes","Billy","Bob","Calvin","Christina","Cindy"];
function myFunction() {
let input, filter, ul, li, liElem, i, txtValue;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
ul = document.getElementById("myUL");
li = ul.getElementsByTagName("li");
for (i = 0; i < li.length; i++) {
liElem = li[i];
txtValue = liElem.textContent || liElem.innerText;
if (txtValue.toUpperCase().indexOf(filter) > -1) {
li[i].style.display = "block";
} else {
li[i].style.display = "none";
}
}
}
function showDiv(){
let liList=(document.getElementById("myUL")).getElementsByTagName("li");
for(var i=0;i<liList.length;i++){
(liList[i]).style.display="block";
}
}
function hideDiv(){
let liList=(document.getElementById("myUL")).getElementsByTagName("li");
for(var i=0;i<liList.length;i++){
(liList[i]).style.display="none";
}
}
var selectPlace = function(ids){
document.getElementById("myInput").value=document.getElementById(ids).innerHTML;
hideDiv();
}
var generateList = function(array, eventfn){
let cnt=0;
array.forEach(function(item){
var node = document.createElement("LI"); // Create a <li> node
var textnode = document.createTextNode(item); // Create a text node
node.appendChild(textnode);
node.setAttribute("id", "myLi"+(cnt++));
node.addEventListener("click", ()=>{eventfn(node.getAttribute("id"))});
document.getElementById("myUL").appendChild(node);
});
};
generateList(placeArr,selectPlace);
* {
box-sizing: border-box;
}
#myInput,.myInput {
background-position: 10px 12px;
background-repeat: no-repeat;
width: 50%;
font-size: 16px;
padding: 12px 20px 12px 10px;
border: 1px solid #ddd;
}
#myUL {
list-style-type: none;
padding: 0;
margin: 0;
width:50%;
height:200px;
overflow-y:auto;
position:absolute;
}
#myUL li {
border: 1px solid #ddd;
margin-top: -1px; /* Prevent double borders */
background-color: #f6f6f6;
padding: 12px;
text-decoration: none;
font-size: 18px;
color: black;
display: none;
}
#myUL li a:hover:not(.header) {
background-color: #eee;
}
<h2>My Phonebook</h2>
<div>
<input type="text" id="myInput" class="myInput" onkeyup="myFunction()" onclick=showDiv() placeholder="Search for names.." title="Type in a name">
<ul id="myUL">
</ul>
</div>
<br/>
<div>
<input type="text" class="myInput">
</div>
I have added the Image

Currently, your ul tag is overriding the div underneath. So for:
<div style="z-index: 1; position: relative;">
<input type="text" class="myInput">
</div>
just add the z-index and position to have it on top. You will have to add in a style to the ul tag though onclick to override it when it is in use.
.override{
z-index: 10;
position: relative;
}
function showDiv(){
let liList=(document.getElementById("myUL")).getElementsByTagName("li");
for(var i=0;i<liList.length;i++){
(liList[i]).style.display="block";
}
li = document.getElementById('myUL'); // added this line
li.classList.add("override"); // added this line
}
function hideDiv(){
let liList=(document.getElementById("myUL")).getElementsByTagName("li");
for(var i=0;i<liList.length;i++){
(liList[i]).style.display="none";
}
li = document.getElementById('myUL'); // added this line
li.classList.remove("override"); // added this line
}
https://jsfiddle.net/tgq65jas/

The second text box is being obscured by the myUL element. In the hideDiv function, each of the li elements have their display set to none, but myUL is still there.
Rather than setting display: none for each li, set display: none on the entire ul.

limit the drop down link display in html

I created an dropdown list, it have more than 25 link dropdown to display , So
i need to show only 3 from the dopdown list (not to disable others) , and perform the search option to all . please help me to find a solution
<div class="dropdown">
<input onclick="myFunction()" class="dropbtn" id="myInput"
onkeyup="filterFunction()">
<div id="myDropdown" class="dropdown-content">
About
Base
Blog
Contact
Custom
Support
Tools
</div>
</div>
<script>
/* When the user clicks on the button,
toggle between hiding and showing the dropdown content */
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
function filterFunction() {
var input, filter, ul, li, a, i;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
div = document.getElementById("myDropdown");
a = div.getElementsByTagName("a");
for (i = 0; i < a.length; i++) {
if (a[i].innerHTML.toUpperCase().indexOf(filter) > -1) {
a[i].style.display = "";
} else {
a[i].style.display = "none";
}
}
}
</script>
css file
.dropbtn {
background-color:#E8E0DE;
color: white;
padding: 6px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropbtn:hover, .dropbtn:focus {
background-color:#FAF6F5;
}
#myInput {
border-box: box-sizing;
position:relative;
top: 10px;
color:black;
background-position: 1px 2px;
background-repeat: no-repeat;
font-size: 16px;
padding: 5px 350px 10px 15px;
border: none;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f6f6f6;
min-width: 230px;
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown a:hover {background-color: #ddd}
.show {display:block;}
</style>

You just want to return at most 3 at all times you'll want to add a function similar to your filter function, but after it finds 3 items that have a display style set to "" set the rest to "none".
function limitVisibility() {
let div, a, i;
div = document.getElementById("myDropdown");
a = div.getElementsByTagName("a");
for (i = 0; i < a.length; i++) {
let counter = 0;
if (counter < 3 && a[i].style.display === "" ) {
counter += 1;
} else {
a[i].style.display = "none";
}
}
}
and include it in your onClick and onkeyup:

try this:
function filterFunction() {
var input, value, filter, ul, li, a, i, limit, init;
input = document.getElementById("myInput");
value = document.getElementById("myInput").value; // ADD INPUT VALUE
filter = input.value.toUpperCase();
div = document.getElementById("myDropdown");
a = div.getElementsByTagName("a");
init = 0;
limit = 3;
for (i = 0; i < a.length; i++) {
if( (a[i].innerHTML.toUpperCase().indexOf(filter) > -1) ) {
if (init < limit) // LIMIT to FIRST 3 results
{
a[i].style.display = "";
}
else if(value =='') // Case when Input is Empty
{
a[i].style.display = "";
}
else
{
a[i].style.display = "none";
}
init++; // counting results
}
else
{
a[i].style.display = "none";
}
}
}