Develop Reference

How to restore div which is hidden using empty() function

html code:
<button id="add"></button>
<div id="count_search">
<span class="total_count">Total: <span id="record_count"></span></span></span>
<input type="text" class="txtbox search" placeholder="Search" id="search">
</div>
Jquery code:
$("#add").click(function(){
$("#count_search").empty();
})
I want to show count_search div once again on clicking on any other button execpt to add button
In above code add is button on which empty() is implimented. On clicking on add button count_search is got hide. Then after I want to restore that div content

.empty() deletes the elements in your container (count_search).
Instead, you can use .hide()/.show() or better approach, you can use .toggle() that show or hide your element.
$("#add2").click(function() {
$("#count_search").toggle();
});
$("#add").click(function() {
if ($("#count_search").is(":visible")) {
$("#count_search").hide();
} else {
$("#count_search").show();
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button id="add">Show/Hide</button>
<button id="add2">Toggle</button>
<div id="count_search">
<span class="total_count">Total: <span id="record_count"></span></span></span>
<input type="text" class="txtbox search" placeholder="Search" id="search">
</div>

By empty() you are deleting an item in DOM.
Instead of empty, you can use toggle(), which hides the element and If you click once again, the item will show.
$("#add").click(function(){
$("#count_search").hide();
})

How to Make a button disabled until a hyperlink is clicked

I'm working on a project where a button needs to be disabled until a hyperlink is clicked and a checkbox is checked. I currently have the checkbox part down using jQuery:
$('#tc-checkbox').change(function(){
if($(this).is(":checked")) {
$('#tc-btn').removeClass('tc-disable');
} else {
$('#tc-btn').addClass('tc-disable');
}
});
But I also need to set it up so the class of tc-disable is still on the button until an anchor tag is clicked as well. I've never really done this before where a link needs to be clicked before removing a class and couldn't find what I was looking for as I was Googling for an answer.

Hope the code below helps. I also added console out put so you can track the value. Another option is use custom attribute on link element instead of javascript variable to track if the link is clicked.
var enableLinkClicked = false;
$('#tc-link').click(function() {
enableLinkClicked = true;
console.log("link clicked\ncheckbox value: " + $($('#tc-checkbox')).is(":checked"));
console.log("link clicked: " + enableLinkClicked);
if ($('#tc-checkbox').is(":checked")) {
$('#tc-btn').removeClass('tc-disable');
}
});
$('#tc-checkbox').change(function() {
console.log("checkbox clicked\ncheckbox value: " + $(this).is(":checked"));
console.log("link clicked: " + enableLinkClicked);
if ($(this).is(":checked") && enableLinkClicked) {
$('#tc-btn').removeClass('tc-disable');
} else {
$('#tc-btn').addClass('tc-disable');
}
});
#tc-btn.tc-disable {
background: red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<button id="tc-btn">My Button</button>
<br/>
<a id="tc-link" href="javascript:void(0);">Link to enable button</a>
<br/>
<input type="checkbox" id="tc-checkbox" />

If the page is refreshing or taking you to a different page when you click the hyperlink, you will want to look into sessionStorage. When the hyperlink is clicked you will want to set a sessionStorage variable and when the page loads you want to check that variable to see if it is populated. If the variable is populated, enable the button.
Set the variable.
sessionStorage.setItem('key', 'value');
Get the variable
var data = sessionStorage.getItem('key');
If you need to re-disable the button you can clear the session storage and reapply the disabled class.
sessionStorage.clear();
You can learn more about session storage here.
If the page does not refresh you could just set an attr on the link when it is clicked like so.
$('#tc-link').on('click', function() {
$(this).attr('clicked', 'true');
});
Then when the checkbox is checked you can check this in your function.
$('#tc-checkbox').change(function(){
if($(this).is(":checked") && $('#tc-link').hasAttr('clicked')) {
$('#tc-btn').removeClass('tc-disable');
} else {
$('#tc-btn').addClass('tc-disable');
}
});
These are just some solutions I could think of off the top of my head. Hope this helps.

Maybe this is better for you. First you make an .on('click' event listener on the anchor element, then, if the checkbox is checked enable the button. I added the else statement to disable the button if a user clicks the link and the checkbox is not set for an example. In this example you don't need the classes.
But if you needed to keep the the classes then you would replace the $('#tc-btn').prop('disabled', false); with $('#tc-btn').addClass() or .removeClass()
$( '#theLink' ).on( 'click', function(e)
{
e.preventDefault();
if($('#tc-checkbox').is(':checked'))
{
$('#tc-btn').prop('disabled', false);
$('#tc-btn').val('Currently enabled');
}
else
{
$('#tc-btn').val('Currently disabled');
$('#tc-btn').prop('disabled', true);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" id="tc-checkbox" />
This link will enable the button
<input type="button" id="tc-btn" value="Currently disabled" disabled="disabled"/>

Here a much more simple solution and it handles the state of the button if they uncheck the "I Accept" checkbox. It is pretty easy to implement. I just used Bootstrap to pretty up the example.
//Handles the anchor click
$("#anchor").click(() => {
$("#anchor").addClass("visited");
$("#acceptBtn").prop("disabled", buttonState());
});
//Handles the checkbox check
$("#checkBx").on("change", () => {
$("#acceptBtn").prop("disabled", buttonState());
});
//Function that checks the state and decides if the button should be enabled.
buttonState = () => {
let anchorClicked = $("#anchor").hasClass("visited");
let checkboxChecked = $("#checkBx").prop("checked") === true;
return !(anchorClicked && checkboxChecked);
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container">
<div class="row">
<div class="col-md-12">
View Terms
</div>
</div>
<div class="row">
<div class="col-md-12">
<label class="form-check-label">
<input class="form-check-input" id="checkBx" type="checkbox" value="">
I accept the terms
</label>
</div>
</div>
<div class="row">
<div class="col-md-12">
<button id="acceptBtn" class="btn btn-success" disabled="disabled">
Ok
</button>
</div>
</div>
</div>

A one-liner solution using Javascript could be:
<input type="submit" id="test" name="test" required disabled="disabled">
<label for="test">I clicked the <a target="_blank" href="https://stackoverflow.com" onclick="document.getElementById('test').disabled=false">link</a>.</label>
Change the type "submit" to "button" or "checkbox" accordingly to your needs.

How to check whether link button is disabled or not

After rendering code in browser the anchor tag is generated as
<a onclick="alert();" id="ctl00_RightContent_lnkSaveTop" title="Select Mail then Click to Send..." class="btn btn-u" data-rel="tooltip" data-container="body" data-toggle="popover" data-placement="top" data-content="Select Mail then Click to Send..." href="javascript:__doPostBack('ctl00$RightContent$lnkSaveTop','')" style="float: right" data-original-title="Send Email" disabled="disabled">
Send Mail
</a>
I have written jquery as below lines of code
$(document).ready(function () {
$('#<%= lnkSaveTop.ClientID%>').click(function () {
if ($(this).is(':disabled')) {
alert('No need to click, it\'s disabled.');
}
});
});
Basically I want that if disabled button is clicked, then the tooltip should be displayed.

Try:
if ($(this).attr('disabled') === "disabled") {
alert('No need to click, it\'s disabled.');
}
if you intend to use readonly attribute, it's the same, replace 'disabled' with 'readonly '

What you can do is have a custom data attribute on your input button which is a blank string. Then when the mouse enters the button you remove the title and place it inside of your empty data attribute and remove title, this will stop the tooltip from appearing. You then listen for the click even on the input and then move copy the text from the data attribute to the title and that should do the trick
Here is my jsFiddle : https://jsfiddle.net/44vof888/
jQuery
$(function () {
$('input').mouseenter(function () {
$(this).data('title', this.title)
this.title = '';
});
$('input').on('click', function () {
this.title = $(this).data('title');
});
});
html
<input type="button" data-title="" value="Hello" title="Half an update" readonly="readonly"></input>

Change closest input val?

I have an instance where my datepickers won't work by button click, so I figure find the closest input and .click() or .focus() (for it's datepicker, since the same field is to be affected). For the sake of this demo, from the button/icon click - find the closest input and focus/click on it. If correct, the border will glow blue. http://jsfiddle.net/81tvr0op/
HTML
<table>
<tr>
<th>
<div class="input-group date">
<input type="text" />
<span class="input-group-btn">
<button class="btn default" type="button">
<i class="fa fa-calendar"></i>
Icon
</button>
</span>
</div>
</th>
</tr>
</table>
jQuery
...something like
$(".date > span > button").on('click', function (e) {
e.preventDefault();
$(this).closest("th").find("input:text").click();
});
...right?

If I understand correctly, you are trying to place the cursor into the input box when the user clicks the button.
To do that, you should use .focus() instead of .click().
Working example:
http://jsfiddle.net/81tvr0op/1/

From your jsfiddle, something like this should work.
$("button").on('click', function (e) {
e.preventDefault();
$(this).parent().siblings(0).focus();
});
Or, give your input an id and do something like:
$("button").on('click', function (e) {
e.preventDefault();
$("#dateInput").focus();
});

How to prevent click event over the whole span with children?

How to prevent triggering the calendar, not only by clicking on the icon but on the whole tag? In this case if I'm trying to do this directly without children selector it's doesn't working.
My implementation
HTML:
<div id="datetimepicker1" class="input-append date">
<input type="text" disabled="true"></input>
<span class="add-on disabled">
<i data-time-icon="icon-time" data-date-icon="icon-calendar"></i>
</span>
</div>
JS:
$(function () {
$('#datetimepicker1').datetimepicker();
$(".disabled").children().bind('click', function () {
return false;
});
});

EDIT : http://jsfiddle.net/vg4xa/1/
You have to set your event handler before datepicker init, and stop event propagation :
$(function () {
$('.disabled').bind('click', function(e){
e.stopImmediatePropagation();
});
$('#datetimepicker1').datetimepicker();
});

I know that this answer will not work for the subject, but in the issue description, there is a datepicker and next code works for me to prevent datepicker opening on span or calendar icon click
if (disable) {
$('#datetimepicker1').datepicker('_detachEvents');
$('#datetimepicker1').datepicker('_detachSecondaryEvents');
} else {
$('#datetimepicker1').datepicker('_attachEvents');
$('#datetimepicker1').datepicker('_attachSecondaryEvents');
}