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How could I avoid WYSIWYG buttons to follow the link

I am trying to build an editor. Once I click an any button ( bold, or italic,...) it follows the link. Here is what I have tried out.
function execCmd(command) {
document.execCommand(command, false, null);
}
function execCommandWithArg(command, arg) {
document.execCommand(command, false, arg);
}
<form>
<div id="text_section">
<button onclick="execCmd('bold');"><i class="fas fa-bold"></i></button>
<button onclick="execCmd('italic');"><i class="fas fa-italic"></i></button>
<button onclick="execCommandWithArg('createLink', prompt('Enter a RUL','http://'));"><i class="fas fa-link"></i></button>
<button onclick="execCmd('unlink');"><i class="fas fa-unlink"></i></button>
<div class="p-2" contenteditable="true" id="content_text" style="border:solid; width:200px; heigth:100px;"></div>
</div>
<div class="form-group">
<input type="button" name="submit" value="Post text" id="submit" class="btn py-3 px-4 btn-primary">
</div>
</form>
How could I use e.preventDefault(); function on it ?
This code lines seem to work as expected, but the problem is not solved in my programm.
I think e.preventDefault(); might solve the problem.
Thank you for taking the time to answer my question.

Your callback needs to return false.
Try
<button onclick="execCmd('bold'); return false;">
Or
<button onclick="return execCmd('bold');">
function execCmd(command)
{
document.execCommand(command, false, null);
return false;
}

When button element is inside a form element it acts as submit unless it's type attribute say different (etc: reset, button).
So a quick fix will be to set type="button to your editing buttons:
<button type="button" onclick="execCmd('bold');">
<i class="fas fa-bold"></i>
</button>
Enjoy code!

Validate a form element without/before submitting the form with JavaScript

I have an HTML form that has its elements displayed in various Bootstrap modals. The first modal has a text box input that and a "Next" button to open the next modal. When the "next" button is pressed. I want to check if the text box is empty, and trigger a validation message. The form does not get submitted until the very end. Everything I've tried has not worked so far.
Javascript/jQuery code
$("#add_assistant_next").click(function () {
var textInput = document.getElementById('add_assistant_user');
var text = textInput.value;
if (text === "") {
textInput.setCustomValidity('Please fill out this field.');
textInput.checkValidity();
var form = $('#form_add_assistant');
form.find(':submit').click();
} else {
textInput.setCustomValidity('');
}
});
HTML
<form name="add_assistant" method="post" id="form_add_assistant">
<div class="modal-body">
<div class="step">
<span class="fas fa-arrow-right choose-arrow mr-1"></span>1. Choose a user to add
</div>
<div class="pl-3 pt-1">
<div>
<input type="text" id="add_assistant_user" name="add_assistant[user]" required="required" placeholder="UCInetID or UCI email address" class="mr-0 form-control" />
<button type="button" id="add_assistant_next" name="add_assistant[next]" data-toggle="modal" data-target="#add-user-modal" class="btn btn-outline-secondary btn">Look up user</button>
</div>
<input type="hidden" name="user_search_route" value="/courseSpace/20900/listAssistantEnrollment">
</div>
</div>
... form continues in other modals

Your JS code is probably fighting with Bootstrap for control of that button. To get around that, and have your validation, you could try modifying your code to have a middle step / temporary button to help with validation first before actually submitting. So something like this:
Javascript/jQuery code
$("#my_temp_button").click(function () {
var textInput = document.getElementById('add_assistant_user');
var text = textInput.value;
// Might also want to handle null and undefined cases?
if (text === "" || text === undefined || text === null) {
// I'm assuming if it's empty, it doesn't pass validation,
// so we just display this warning and wait for the user to fix it:
textInput.setCustomValidity('Please fill out this field.');
} else {
// it's not empty so validate:
if (textInput.checkValidity()) {
// it passed validation, so ok to submit.
// call the real button:
$('#add_assistant_next').click();
// do you need this?
var form = $('#form_add_assistant');
form.find(':submit').click();
} else {
// it failed validation, so display another error?
textInput.setCustomValidity('Try again.');
}
}
});
HTML:
<form name="add_assistant" method="post" id="form_add_assistant">
<div class="modal-body">
<div class="step">
<span class="fas fa-arrow-right choose-arrow mr-1"></span>1. Choose a user to add
</div>
<div class="pl-3 pt-1">
<div>
<input type="text" id="add_assistant_user" name="add_assistant[user]" required="required" placeholder="UCInetID or UCI email address" class="mr-0 form-control" />
<!-- Feel free to change the id name. This is the button the user sees. It's only purpose is to give your function above full control to it and prevent Bootstrap from touching it and jumping to the next modal without having the user fix the validation failure first: -->
<button type="button" id="my_temp_button" class="btn btn-outline-secondary btn">Look up user</button>
<!-- Hide the real button from the user: -->
<div style="display:none">
<button type="button" id="add_assistant_next" name="add_assistant[next]" data-toggle="modal" data-target="#add-user-modal" class="btn btn-outline-secondary btn">Look up user</button>
</div>
</div>
<input type="hidden" name="user_search_route" value="/courseSpace/20900/listAssistantEnrollment">
</div>
</div>
...

Have you tried adding a trap for the submit event itself?
$('#form_add_assistant').submit(function(evt){
//do your validation here
if (validation fails){
return false; // OR, alternatively, `evt.preventDefault()`
}
//form submission will continue if not returned false
});
References:
https://api.jquery.com/submit/
How to conduct manual form validation via jQuery .submit()

How to stop next page to be loading

In my project, while a particular button is clicked I want to stop the next page appearing. Here is my JavaScript code:
function checkcond() {
check_value=document.getElementById("chkvalue");
if(check_value==null){
alert(check_value);
document.firstform.textview.focus();
return false;
}
}
and button code is:
<form id="payment_form" name="payment_form" action="<?php echo site_url("cont/accept");?>" method="post">
<input id="chkvalue" name="chkvalue" type="hidden">
<button type="submit" id="submit_button" class="btn btn-primary" onclick="checkcond()">
<b>Make a Payment</b>
<span class="fa fa-hand-o-right" aria-hidden="true"></span>
</button>
Here after checking the check_value I want to keep my current page while it is null. How should it be done? Is there any function for that?

My suggestion would be to remove inline javascript
and use like this
document.getElementById('payment_form').onsubmit = function() {
return checkcond();
};
or if you want to use inline method, change onclick method like this
<button type="submit" id="submit_button" class="btn btn-primary" onclick="return checkcond()"><b>Make a Payment</b>

selecting all class within this in query

well right now I am doing something like this to find all textbox values which has the same class name.
function generalBottom(anchor) {
var sends = $('input[data-name^="noValues"]').map(function(){
$(this).attr('value',$(this).val());
return $(this).val();
}).get();
}
and i call this function on a onclick of submit button like generalBottom(this)
and I have something like as per my requirement
When I click submit button of User I call a general function passing this as a parameter, but the above code gives me the text values of client as well
["perfect", "hyperjack", "julie", "annoying", "junction", "convulated"], which is undesired, I want only ["annoying", "junction", "convulated"] using my anchor params.
How to do this via my this parameter, I thought to traverse through my tags using children(), parent() but I won't be knowing how many fields user have added as its all dynamic, user can add as many values(text boxes).
I tried this
1) $(anchor).find('.rightAbsNo')
2) $(anchor).find('input[data-name^="noValues"]')
3) $(anchor).find('.rightAbsNo').map(function () {
console.log($(this).find('. showNoButton')); })
None of this worked for me.
My html is somewhat like this, code
<div id="attach0" class="leftbottomno">
<div style="overflow: hidden" class="leftbottomAbsolute" id="">
<form>
<span class="absno"><input type="text" required=""
id="absdelete" data-inputclass="leftbottomAbsoluteNo_class"
value="" class="leftbottomabsolutenotest keys" data-value=""
style="margin-bottom:4px; color: #1c1c1c;"> </span>
<a onclick="addAbsoluteValues(this);" style="margin-left: 50px">
<i class="fa fa-plus-circle color-blue-grey-lighter"></i> </a>
</form>
<a onclick="deleteAbsoluteEmpty(this);> </a><br>
<div class="rightAbsNo" id="yesValueattach">
<div class="rightAbsNoValue">
<input type="text" id="nonattach" placeholder="values"
data-name="noValues" data-inputclass="absYes_class" value="annoying"
class="showNoButton showActivity value" data-value="">
<button type="button" onclick="generalBottom(this);">
<i class="glyphicon glyphicon-ok"></i></button>
</div>
</div>
<div class="rightAbsNo" id="yesValueattach">
<div class="rightAbsNoValue" id=""> <input type="text"
data-name="noValues" data-inputclass="absYes_class" subattribute=""
value="" class="showNoButton showActivity value" data-value="">
<button type="button" onclick="generalBottom(this);">
<i class="glyphicon glyphicon-ok"></i></button>
</div>
</div>
<div class="rightAbsNo" id="yesValueattach">
<div class="rightAbsNoValue" id="">
<input type="text" data-name="noValues"
data-inputclass="absYes_class" placeholder="values" subattribute=""
value="junction" class="showNoButton showActivity value"
data-value="" >
<button type="button" style="display: none;"
onclick="generalBottom(this);">
<i class="glyphicon glyphicon-ok"></i>
</button>
</div>
</div>
</div>
</div>

First of all, you need to define a container to the groups with something like :
<div class="container">input groups</div>
<div class="container">input groups</div>
and change <button type='submit'> to <button type='button'> to prevent submitting the form.
Then change your function to this:
function generalBottom(anchor) {
var all_inputs = $(anchor).parent(".container").find("input");
var input = $(anchor).siblings('input').first();
all_inputs.each(function(){
$(this).val(input.val());
});
}

Here's Jsfiddle
first $(anchor).siblings(input) find inputs
then go through each element from first step and return their value
function generalBottom(anchor) {
var input = 'input[data-name^="noValues"]'
var values = $.map($(anchor).siblings(input), (elemnt, index)=>{
return elemnt.value
})
$('#shows').val(values.join())
}
$('button').on('click',function(){
generalBottom(this)
})
hope this helps

Skip Validation on cancel button in AngularJS

I try to achieve the following functionality. Have editable form inputs in an angular application. For example a user can see his first name being fetched by the server and then clicking an edit button the form text input appears, edit button disappears and in its place the buttons save and cancel appear. I use the angular-bootstrap-show-errors component to show errors.
However when a validation rule is not fulfilled during editing and I click on cancel button the form tries to show the error before going back to the starting state. For example, I press edit and delete all the first name characters, then press cancel, so before disappearing it tries to validate. Below is my view.
<!--First name edits-->
<div class="row">
<form name="firstNameEditForm" role="form" novalidate>
<div class="col-xs-3">
<p class="text-right">First Name:</p>
</div>
<div class="col-xs-6" ng-if="model.beforeFirstNameEdit">
<p class="text-success">
{{accountData.firstname || "Loading..."}}
</p>
</div>
<div class="col-xs-6" ng-if="!model.beforeFirstNameEdit">
<div class="form-group" show-errors>
<input name="firstName" ng-model="accountData.firstname" class="form-control" placeholder="First Name" type="text" required minlength=2 auto-focus />
<small class="help-block" ng-if="firstNameEditForm.firstName.$error.required">At least 2 characters required</small>
<small class="help-block" ng-if="firstNameEditForm.firstName.$error.minlength">At least 2 characters required</small>
</div>
</div>
<div class="col-xs-3" ng-if="model.beforeFirstNameEdit">
<button type="button" class="btn btn-warning btn-xs" ng-click="editFirstName()">Edit</button>
</div>
<div class="col-xs-3" ng-if="!model.beforeFirstNameEdit">
<button type="button" class="btn btn-success btn-xs" ng-click="update(accountData.firstname)">Save</button>
<button type="button" class="btn btn-danger btn-xs" ng-click="cancelFirstNameEdit()">Cancel</button>
</div>
</form>
</div><!--First name edits-->
And the controller
$scope.preFirstNameEditModel = {};
$scope.editFirstName = function() {
// Copy preedited data locally
$scope.model.beforeFirstNameEdit = false;
$scope.preFirstNameEditModel = angular.copy($scope.accountData.firstname);
}
$scope.cancelFirstNameEdit = function(){
$scope.model.beforeFirstNameEdit = true;
$scope.accountData.firstname = angular.copy($scope.preFirstNameEditModel);
};
How can I completely avoid validation when I click on cancel button? I read some answers on similar questions suggesting to change the type of button to type = "button" but still doesn't solve my issue.

The validation of the fields is triggered on focus lost, whichis causing the validation message. You can prevent this behaviour by using ng-show="submitted && firstNameEditForm.firstName.$error.required" and ng-show="submitted && firstNameEditForm.firstName.$error.minlength". This causes the message showing up only when the form is submitted.
Furthermore you have to change the type of the update button to submit.