Develop Reference

Disabling a dropdown if a Textfield contains a certain value

I have an issue with HTML and Javascript where I'm trying to create a condition that follows the following rules:
If the first text-box contains a certain word, disable the following drop-down.
If it doesn't contain that certain word, keep it enabled.
So far, I've got this code
var noSample = "HW8020";
const interval = setInterval(function() {
// method to be executed;
function codeCheck() {
var x = document.getElementById("form-RequestAQuoteUK-9bbb_Products_Interest_Value").value;
}
function validateSample() {
if ( x == noSample) {
document.getElementById(
"form-RequestAQuoteUK-9bbb_DropDown_Samples_SelectedValue"
).disabled = true;
} else {
document.getElementById(
"form-RequestAQuoteUK-9bbb_DropDown_Samples_SelectedValue"
).disabled = false;
}
}
}, 5000);
The noSample variable being the code that, when input into the text-field, will disable the dropdown. The Ids weren't my choice of naming, but I'm new to Javascript and am trying to fix an issue with the company I work for!
Any ideas?

You should rather use event input instead of setInterval and use indexOf to check if input.value contains certain value.
var noSample = "HW8020";
let input = document.getElementById(
"form-RequestAQuoteUK-9bbb_Products_Interest_Value",
);
input.addEventListener("input", () => {
validateSample(input.value)
});
function validateSample(inputValue) {
let selectEl = document.getElementById(
"form-RequestAQuoteUK-9bbb_DropDown_Samples_SelectedValue",
);
if (inputValue.indexOf(noSample) > -1) {
selectEl.disabled = true;
} else {
selectEl.disabled = false;
}
}

As suggested in the comments, you can add an event listener to your Products_Interest_Value input and then enable or disable the dropdown based on whether or not this matches your noSample value.
const noSample = "HW8020";
document.querySelector("#form-RequestAQuoteUK-9bbb_Products_Interest_Value").addEventListener("input", e => {
document.querySelector("#form-RequestAQuoteUK-9bbb_DropDown_Samples_SelectedValue").disabled = (e.target.value == noSample);
});

IF condition need to check evrytime

I am using the below code to render the same as many as times,
I have two sections, one section with show-all class and another with no class.
When 'show-all' class is not available, it need to run countIncrease function, if class available no need to run the function,
In every time section need to check whether the class is available or not.
class Grid {
init() {
$('.grid').each(function() {
const $this = $(this);
// getting values & url from from html
const dropDownUrlpath = $this.find('.grid__dropdown-select').attr('data-ajaxurl');
const hasClass = $this.find('.grid').hasClass('grid_showall');
// countIncrease shows the inital 6 compoents/div and rest of will be hidden
// onclick it will display 3 components/div
function countIncrease() {
let limit = parseInt($this.find('.grid__component').attr('data-initcount'), 10);
const incrementalCall = parseInt($this.find('.grid__component').attr('data-incrementalcount'), 10);
$this.find(`.grid__content > .grid__component:gt(' ${limit - 1} ') `).hide();
if ($this.find('.grid__content > .grid__component').length <= limit) {
$this.find('.grid__cta').hide();
}
else {
$this.find('.grid__cta').show();
}
$this.find('.grid__cta').on('click', function(event) {
event.preventDefault();
limit += incrementalCall;
$this.find(`.grid__content > .grid__component:lt(' ${limit} ')`).show();
if ($this.find('.grid__content > .grid__component').length <= limit) {
$this.find('.grid__cta').hide();
}
});
}
if (hasClass.length === true ) {
console.log('class exist-----'+ hasClass);
countIncrease();
}
// on dropdown change taking the selected dropdown value and adding #end of the url and replacing the previous html
$this.find('.grid__dropdown-select').on('change', function() {
const optionValue = this.value;
$.ajax({
url: dropDownUrlpath + optionValue,
success(result) {
$this.find('.grid__content').html(result);
countIncrease();
}
});
});
});
}
}
I written if condition, but it running once and giving false condition in both the scenarios,
if (hasClass.length === true ) {
console.log('class exist-----'+ hasClass);
countIncrease();
}
How to handle it...?

shouldnt you add a parameter to the .hasClass so it knows what to check?
if ( $this.hasClass ('some class') === true ) {
alert('something');
}
or set if(hasClass.length > 0){}

keep the checking class in a variable by finding with parent div,
const hasClass = $this.find('.grid').hasClass('grid_showall');
gets the attribute value for only the first element in the matched set with .attr() method
const classInthis = hasClass.attr('class');
check the condition, with
if (classInthis !== 'grid_showall') {
countIncrease();
}

Unwanted "display: none" added on class change in jQuery

I've got a weird bug happening on a music library site that I'm working on. The intended functionality (take a form of checkboxes, dynamically change them into selectable words that highlight and "check" the associated checkbox on click, then automatically update the songs below based on the highlighted tags) works fine -- but when you click a selected tag to remove it, it does the correct functionality with the data below and the highlight is removed, but all other selected tags are getting "display: none" added to them.
Here, I think, is the function causing the weird issue:
// Given an label "$label," if it hasn't been selected, then
// highlight the label area and set the "checked" value of the
// appropriate checkbox input to true; if it is already selected,
// remove the highlight and set the "checked" value of the appropriate
// checkbox to "false"
function highlightAndCheck( $label )
{
var id = $label.attr("id"),
$checkbox = $label.prev(),
val = $checkbox.attr("value");
if( id === val )
{
if( $label.hasClass("clicked") )
{
$checkbox.prop("checked", false);
$label.removeClass("clicked");
} else
{
$checkbox.prop("checked", true);
$label.addClass("clicked");
}
}
}
Here's the full jQuery code for the page. I can provide more code if anything is confusing, but I hope the labeling, etc. are straightforward:
$(function() { //on document ready
var $categoriesAndTags = $("div#categories-and-tags"),
$tagCategory = $categoriesAndTags.find("div.tag-category"),
$searchButton = $categoriesAndTags.find("input#public-user-tag-search-submit");
// First, hide the checkboxes and search button, since we don't need them in the dynamic version
$tagCategory.addClass("tag-spinner-skin")
.find("input[type=checkbox]").hide();
$tagCategory.find("br").hide();
$searchButton.hide();
// Make it so then clicking on the text of a tag makes the hidden select box "select"
$tagCategory.find("label").each(function(){
$(this).on("click",function(){
var $this = $(this);
highlightAndCheck( $this );
searchByTags();
//While the unwanted "display:none" bug is happening, use this to make them re-appear on next click
$this.siblings("label").show();
});
});
// Make the search update automatically when a select box is clicked or unclicked.
var tagIDs = getUrlVarValArray( "tagID" );
$tagCategory.find("label").each(function(){
var $this = $(this),
id = $this.attr("id");
if( tagIDs.indexOf( id ) > -1 )
{ highlightAndCheck( $this ); }
});
});
function searchByTags( tags )
{
data = $("form#tag-select input").serialize()
if( data.length > 0 )
{
data += "&search=search";
}
$.ajax({
url: "songs/",
data: data,
type: "GET",
success: function(data){
// DO THIS if we successfully do the Ajax call
$newSongPlayers = $(data).find("div#songs-area");
$("div#songs-area").replaceWith( $newSongPlayers );
$.getScript("javascripts/public.js");
}
});
}
// Given an label "$label," if it hasn't been selected, then
// highlight the label area and set the "checked" value of the
// appropriate checkbox input to true; if it is already selected,
// remove the highlight and set the "checked" value of the appropriate
// checkbox to "false"
function highlightAndCheck( $label )
{
var id = $label.attr("id"),
$checkbox = $label.prev(),
val = $checkbox.attr("value");
if( id === val )
{
if( $label.hasClass("clicked") )
{
$checkbox.prop("checked", false);
$label.removeClass("clicked");
} else
{
$checkbox.prop("checked", true);
$label.addClass("clicked");
}
}
}
function getUrlVarValArray( needle )
{
var results = [],
hash,
hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
for(var i = 0; i < hashes.length; i++)
{
hash = hashes[i].split('=');
if( needle.length > 0 )
{
if( hash[0] === needle )
{
results[ results.length ] = hash[1]; // array[ array.length ] is a faster way to apend than array.push() in small arrays
}
}
}
return results;
}
Thanks in advance for your help! If it's helpful to login and see this in context, please go to the test site and use username: stackoverflowuser; password: HelpMeFigureThisOut -- once you're logged in, click on "View Songs"and the jQuery is referencing the tags at the top of the page.

Look at the following code in the public.js file:
$("html").on("click", function(event){
if(!$(event.target).is('.options-button')
&& !$(event.target).is('input.add-new-playlist')
&& !$(event.target).is('button.submit-new-playlist')
&& !$(event.target).is('button.add-song-to-playlist')
&& !$(event.target).is('button.playlist-popup-button')
)
{
if(!$(event.target).is('.clicked') && !$(event.target).is('.clicked > div') )
{ $(".clicked").hide().removeClass("clicked"); }
}
});
This handler gets executed because the click event propagates from the <label> element to the <html> element. It executes after the click handler on the <label> element, which removes the "clicked" class from the <label> element. Since the <label> element is the event.target and no longer has the "clicked" class, the following line is executed:
$(".clicked").hide().removeClass("clicked");
That line hides all the labels that still have the "clicked" class.

Compare onclick action of two html button using javascript

I have this two HTML Form buttons with an onclick action associated to each one.
<input type=button name=sel value="Select all" onclick="alert('Error!');">
<input type=button name=desel value="Deselect all" onclick="alert('Error!');">
Unfortunately this action changes from time to time. It can be
onclick="";>
or
onclick="alert('Error!');"
or
onclick="checkAll('stato_nave');"
I'm trying to write some javascript code that verifies what is the function invoked and change it if needed:
var button=document.getElementsByName('sel')[0];
// I don't want to change it when it is empty or calls the 'checkAll' function
if( button.getAttribute("onclick") != "checkAll('stato_nave');" &&
button.getAttribute("onclick") != ""){
//modify button
document.getElementsByName('sel')[0].setAttribute("onclick","set(1)");
document.getElementsByName('desel')[0].setAttribute("onclick","set(0)");
} //set(1) and set(0) being two irrelevant function
Unfortunately none of this work.
Going back some steps I noticed that
alert( document.getElementsByName('sel')[0].onclick);
does not output the onclick content, as I expected, but outputs:
function onclick(event) {
alert("Error!");
}
So i guess that the comparisons fails for this reason, I cannot compare a function with a string.
Does anyone has a guess on how to distinguish which function is associated to the onclick attribute?

This works
http://jsfiddle.net/mplungjan/HzvEh/
var button=document.getElementsByName('desel')[0];
// I don't want to change it when it is empty or calls the 'checkAll' function
var click = button.getAttribute("onclick");
if (click.indexOf('error') ) {
document.getElementsByName('sel')[0].onclick=function() {setIt(1)};
document.getElementsByName('desel')[0].onclick=function() {setIt(0)};
}
function setIt(num) { alert(num)}
But why not move the onclick to a script
window.onload=function() {
var button1 = document.getElementsByName('sel')[0];
var button2 = document.getElementsByName('desel')[0];
if (somereason && someotherreason) {
button1.onclick=function() {
sel(1);
}
button2.onclick=function() {
sel(0);
}
}
else if (somereason) {
button1.onclick=function() {
alert("Error");
}
}
else if (someotherreason) {
button1.onclick=function() {
checkAll('stato_nave')
}
}
}

Try casting the onclick attribute to a string. Then you can at least check the index of checkAll and whether it is empty. After that you can bind those input elements to the new onclick functions easily.
var sel = document.getElementsByName('sel')[0];
var desel = document.getElementsByName('desel')[0];
var onclick = sel.getAttribute("onclick").toString();
if (onclick.indexOf("checkAll") == -1 && onclick != "") {
sel.onclick = function() { set(1) };
desel.onclick = function() { set(0) };
}
function set(number)
{
alert("worked! : " + number);
}
working example: http://jsfiddle.net/fAJ6v/1/
working example when there is a checkAll method: http://jsfiddle.net/fAJ6v/3/

Cycle Focus to First Form Element from Last Element & Vice Versa

I have created a form with malsup's Form Plugin wherein it submits on change of the inputs. I have set up my jQuery script to index drop down menus and visible inputs, and uses that index to determine whether keydown of tab should move focus to the next element or the first element, and likewise with shift+tab keydown. However, instead of moving focus to the first element from the last element on tab keydown like I would like it to, it moves focus to the second element. How can I change it to cycle focus to the actual first and last elements? Here is a live link to my form: http://www.presspound.org/calculator/ajax/sample.php. Thanks to anyone that tries to help. Here is my script:
$(document).ready(function() {
var options = {
target: '#c_main',
success: setFocus
};
$('#calculator').live('submit', function() {
$(this).ajaxSubmit(options);
return false;
});
$(this).focusin(function(event) {
var shiftDown = false;
$('input, select').each(function (i) {
$(this).data('initial', $(this).val());
});
$('input, select').keyup(function(event) {
if (event.keyCode==16) {
shiftDown = false;
$('#shiftCatch').val(shiftDown);
}
});
$('input, select').keydown(function(event) {
if (event.keyCode==16) {
shiftDown = true;
$('#shiftCatch').val(shiftDown);
}
if (event.keyCode==13) {
$('#captured').val(event.target.id);
} else if (event.keyCode==9 && shiftDown==false) {
return $(event.target).each(function() {
var fields = $(this).parents('form:eq(0),calculator').find('select, input:visible');
var index = fields.index(this);
var nextEl = fields.eq(index+1).attr('id');
var firstEl = fields.eq(0).attr('id');
var focusEl = '#'+firstEl;
if (index>-1 && (index+1)<fields.length) {
$('#captured').val(nextEl);
} else if(index+1>=fields.length) {
if ($(this).val() != $(this).data('initial')) {
$('#captured').val(firstEl);
} else {
event.preventDefault();
$(focusEl).focus();
}
}
return false;
});
} else if (event.keyCode==9 && shiftDown==true) {
return $(event.target).each(function() {
var fields = $(this).parents('form:eq(0),calculator').find('select, input:visible');
var index = fields.index(this);
var prevEl = fields.eq(index-1).attr('id');
var lastEl = fields.eq(fields.length-1).attr('id');
var focusEl = '#'+lastEl;
if (index<fields.length && (index-1)>-1) {
$('#captured').val(prevEl);
} else if (index==0) {
if ($(this).val() != $(this).data('initial')) {
$('#captured').val(lastEl);
} else {
event.preventDefault();
$(focusEl).select();
}
}
return false;
});
}
});
});
});
function setFocus() {
with (document.calculator)
var recap = document.getElementById(recaptured.value);
if (recap!=null) {
setTimeout(function() {
if (recap.getAttribute('type')=='text') {
recap.select();
} else {
recap.focus();
}
}, 100 );
}
}
Edit #1: I made a few minor changes to the code, which has brought me a little closer to my intended functionality of the script. However, I only made one change to the code pertaining to the focus: I tried to to disable the tab keydown when pressed on the last element (and also the shift+tab keydown on the first element) in an attempt to force the focus on the element I want without skipping over it like it has been doing. This is the code I added:
$(this).one('keydown', function (event) {
return !(event.keyCode==9 && shiftDown==true);
});
This kind of works. After the page loads, If the user presses tab on the last element without making a change to its value, the focus will be set to the second element. However, the second time the user presses tab on the last element without making a change to its value, and every subsequent time thereafter, the focus will be set to the first element, just as I would like it to.
Edit #2: I replaced the code in Edit #1, with code utilizing event.preventDefault(), which works better. While if a user does a shift+tab keydown when in the first element, the focus moves to the last element as it should. However, if the user continues to hold down the shift key and presses tab again, focus will be set back to the first element. And if the user continues to hold the shift key down still yet and hits tab, the focus will move back to the last element. The focus will shift back and forth between the first and last element until the user lifts the shift key. This problem does not occur when only pressing tab. Here is the new code snippet:
event.preventDefault();
$(focusEl).focus();

You have a lot of code I didn't get full overview over, so I don't know if I missed some functionality you wanted integrated, but for the tabbing/shift-tabbing through form elements, this should do the work:
var elements = $("#container :input:visible");
var n = elements.length;
elements
.keydown(function(event){
if (event.keyCode == 9) { //if tab
var currentIndex = elements.index(this);
var newIndex = event.shiftKey ? (currentIndex - 1) % n : (currentIndex + 1) % n;
var el = elements.eq(newIndex);
if (el.attr("type") == "text")
elements.eq(newIndex).select();
else
elements.eq(newIndex).focus();
event.preventDefault();
}
});
elements will be the jQuery object containing all the input fields, in my example it's all the input fields inside the div #container
Here's a demo: http://jsfiddle.net/rA3L9/

Here is the solution, which I couldn't have reached it without Simen's help. Thanks again, Simen.
$(document).ready(function() {
var options = {
target: '#c_main',
success: setFocus
};
$('#calculator').live('submit', function() {
$(this).ajaxSubmit(options);
return false;
});
$(this).focusin(function(event) {
$('#calculator :input:visible').each(function (i) {
$(this).data('initial', $(this).val());
});
return $(event.target).each(function() {
$('#c_main :input:visible').live(($.browser.opera ? 'keypress' : 'keydown'), function(event){
var elements = $("#calculator :input:visible");
var n = elements.length;
var currentIndex = elements.index(this);
if (event.keyCode == 13) { //if enter
var focusElement = elements.eq(currentIndex).attr('id');
$('#captured').val(focusElement);
} else if (event.keyCode == 9) { //if tab
var newIndex = event.shiftKey ? (currentIndex - 1) % n : (currentIndex + 1) % n;
var el = elements.eq(newIndex);
var focusElement = el.attr('id');
if ($(this).val() != $(this).data('initial')) {
$('#captured').val(focusElement);
} else if ((currentIndex==0 && event.shiftKey) || (currentIndex==n-1 && !event.shiftKey)) {
event.preventDefault();
if (el.attr('type')=='text') {
$.browser.msie ? "" : $(window).scrollTop(5000);
el.select().delay(800);
} else {
$.browser.msie ? "" : $(window).scrollTop(-5000);
el.focus().delay(800);
}
} else if (el.is('select')) {
event.preventDefault();
if (el.attr('type')=='text') {
el.select();
} else {
el.focus();
}
}
}
});
});
});
});
function setFocus() {
with (document.calculator)
var recap = document.getElementById(recaptured.value);
if (recap!=null) {
setTimeout(function() {
if (recap.getAttribute('type')=='text') {
recap.select();
} else {
recap.focus();
}
}, 1 );
}
}
I put my files available to download in my live link: http://www.presspound.org/calculator/ajax/sample.php