Develop Reference

Getting selected datalist option value, and innerHTML, without using jQuery

I have a situation where I want to let a user decide titles of books that I have on my db, using an input with a datalist (generated by php), after the user picked a title, he would click a submit button and the form would send the title in another file.
Everything worked fine but I didn't realized that I needed to send the ID of the book that the user selected, because there can be more than one book with the same title.
What I would like to have is the option of the datalist, that no longer has the title of the book inside its "value" attribute, but I want that title inside its innerHTML, so that the title gets displayed, while having the ID inside the "value" attribute. My problem is that if I do that, when the user clicks on the datalist option, the ID gets inside the text input, so the user may not know what book he choose.
summing up: I would like to have the datalist that displays the title, when an option is chosen, that title gets displayed in the text input, when I submit, the Id of the book gets sent in "FindBook.php" inside $_POST.
isIn() checks if the title is inside the array of titles, I would need to change that so that it can check if the ID is inside the array of IDs.
<form onsubmit="alert(document.getElementById('number').value);" action="FindBook.php" target="_blank" method="POST">
<input id="number" list="BooksById">
<input type="submit" value="Find">
</form>
<datalist id="BooksById">
<option value="1">Title1</option>
<option value="2">Title2</option>
<option value="3">Title3</option>
<option value="4">Title4</option>
</datalist>
<br>
<form onsubmit="alert(document.getElementById('string').value);" action="FindBook.php" target="_blank" method="POST">
<input id="string" list="booksByTitle">
<input type="submit" value="Find">
</form>
<datalist id="booksByTitle">
<option value="Title1"></option>
<option value="Title2"></option>
<option value="Title3"></option>
<option value="Title4"></option>
</datalist>
Since I don't understand jQuery I would really prefer a solution that doesn't imply that.

I think that in your case you must use a <select> tag instead of a <datalist> because you do not want the end user to enter new names (or yes?). However you can work with the data attributes like in the code below:
HTML:
<input list="titles" id="title-input" oninput="getBookId()">
<datalist id="titles">
<option data-value="5" value="A book name">
</datalist>
JavaScript:
function getBookId() {
var selectedTitle = document.getElementById("title-input").value;
var value2send = document.querySelector(`#titles option[value='${selectedTitle}']`).dataset.value; // Here now you have the book title id.
console.log("getBookId ~ value2send", value2send)
}
I hope it works for you.

Assuming you can provide distinct title values for each datalist option...
Add a dataset attribute, such as data-id, to your datalist option elements, containing the corresponding id, and add a hidden type input to your form. Then use the onsubmit event handler function to get the selected datalist option's dataset id value and assign it to the value of the hidden input:
function findBook(form) {
form.bookid.value = document.querySelector(`datalist option[value="${form.booktitle.value}"]`).dataset.id;
console.log(form.bookid.value);
return false;
}
<form onsubmit="return findBook(this)">
<input type="hidden" name="bookid">
<input name="booktitle" list="BooksById">
<input type="submit" value="Find">
</form>
<datalist id="BooksById">
<option data-id="1" value="Title1">
<option data-id="2" value="Title2">
<option data-id="3" value="Title3">
<option data-id="4" value="Title4">
</datalist>
Upon form submission, your PHP file will have the variables $_POST['bookid'] and $_POST['booktitle'] available.

Thanks for your suggestions. I prefer to use a datalist, instead of a select tag, because it looks more like a dropdown menu that works like a button. Using datalist allows me to find a book by a random word inside the title of it, while the select only finds the first word of an entry. I can also distinguish different books with the same name by another attribute that states if it's available or if it's taken.
I asked for no JQuery, i appreciate your help but I really don't understand them, even if it's cleaner to use them I would like a solution that doesn't use them.
I ended up using the solution CBroe suggested:
document.getElementById("bookTitle").addEventListener('input', function (evt) {
let data = this.value.split('');
document.getElementById("bookId").value = "";
if(isIn(data,'books')){
document.getElementById("bookId").value = data[0];
document.getElementById("bookTitle").value = data[1];
}
});
function checkForm(id, value, list){
if(isIn([document.getElementById(id).value,document.getElementById(value).value],list)){
alert("Book found");
return true;
}else{
alert("not found")
return false;
}
}
function isIn(value, list) {
switch (list) {
case 'books':
//this was generated by php in my code
if (value[0] == 1 && value[1] == "Title1"){
return true;
}
if (value[0] == 2 && value[1] == "Title2"){
return true;
}
return false;
break;
//I've cut out other cases
}
}
<form onsubmit="checkForm('bookId','bookTitle','books')" action="FindBook.php" target="_blank" method="POST">
<input id="bookTitle" list="booksByTitle" autocomplete="off">
<label>id:</label>
<input id="bookId" <!--type="hidden"-->
<input type="submit" value="Find">
</form>
<datalist id="booksByTitle">
<!-- value was generated by php in my code-->
<option value="1Title1">Title1</option>
<option value="2Title2">Title2</option>
</datalist>

How to cut short multiple if else statements in Javascript

I recently came across a situation where I was working on a huge form with atleast 60 fields and I wanted that form to only submit if all fields were filled and if not, I wanted to show a custom message (Sweetalert) for every field not filled.
For example, If first name was left empty, show the message "Please enter your first name", If country of residence was not selected, show them the message that "Please select your country of residence" so on and so forth.
While I was writing tons of if and else statements to match every field using document.getElementById(), this thought of not doing things right came into my mind. I tried searching the web for this but was unable to find a suitable way of doing such things. Can anyone suggest me a better way rather then writing if else statements of 100 lines ?

By adding a specific class to your form controls you'd be able to retrieve them and iterate through them in order to check which ones are not filled.
Let's say this is your form:
<form id="myForm" name="myForm" novalidate>
<div>
<label for="control_1">Label_1:</label>
<input type="text" id="control_1" name="control_1" class="control" />
</div>
<div>
<label for="control_2">Label_2:</label>
<input type="text" id="control_2" name="control_2" class="control" />
</div>
<div>
<label for="control_3">Label_3:</label>
<input type="text" id="control_3" name="control_3" class="control" />
</div>
<div>
<label for="control_4">Label_4:</label>
<select id="control_4" name="control_4" class="control">
<option value="option_1">Option 1</option>
<option value="option_2">Option 2</option>
<option value="option_3">Option 3</option>
</select>
</div>
<div>
<input type="submit" value="Submit!" />
</div>
</form>
Then you can use the .control class to retrieve all controls and check them:
function onSubmit(e) {
e.preventDefault();
const controls = document
.getElementById("myForm")
.querySelectorAll(".control");
controls.forEach(control => {
if (!isControlFilled(control)) {
console.log(control.id);
// Do whatever you want with control's id
}
});
}
// This is just for illustrative purposes
// Should be adapted to cover all control types
function isControlFilled(control) {
return control.value ? true : false;
}

Dynamically adding and removing div using JQuery?

I'm trying to create a form that allows a user to enter their experience and education
I would like the user to be able to add and remove education or experience.
I am able to do this... sort of. Only the problem is my new divs that I am creating are being appended to the end of the page instead of being appended after the previous div.
These are my scripts:
$(document).ready(function() {
var inputs = 1;
$('#btnAdd').click(function() {
$('.btnDel:disabled').removeAttr('disabled');
var c = $('.clonedInput:first').clone(true);
c.children(':text').attr('name', 'input' + (++inputs));
$('.clonedInput:last').after(c);
});
$('.btnDel').click(function() {
if (confirm('continue delete?')) {
--inputs;
$(this).closest('.clonedInput').remove();
$('.btnDel').attr('disabled', ($('.clonedInput').length < 2));
}
});
});
$(document).ready(function() {
var inputs = 1;
$('#btnAdd2').click(function() {
$('.btnDel2:disabled').removeAttr('disabled');
var c = $('.clonedInput:first').clone(true);
c.children(':text').attr('name', 'input' + (++inputs));
$('.clonedInput:last').after(c);
});
$('.btnDel2').click(function() {
--inputs;
$(this).closest('.clonedInput').remove();
$('.btnDel2').attr('disabled', ($('.clonedInput').length < 2));
});
});
I understand it's bad form to duplicate code like this but I'm not sure how else to else to do it so that clicking the add button doesn't get pressed for the wrong div...
and my html is:
<form id="myForm">
<h2>Education</h2>
<p>Please add all of your education</p>
<div style="margin-bottom: 4px; border: 2px solid; border-style: dashed" class="clonedInput">
Level: <select>
<option value="secondary">Secondary</option>
<option value="someps">Some Post Secondary</option>
<option value="college">College</option>
</select> <br /> <br />
Did you receive a degree, diploma or certificate?<br />
<select>
<option value="certificate">Certificate</option>
<option>Diploma</option>
<option value="degree">Degree</option>
</select> <br />
<input type="button" class="btnDel" value="Remove Education" disabled="disabled" />
</div>
<div>
<input type="button" id="btnAdd2" value="add Education" />
</div>
<h2>Experience</h2>
<p>Please add all of your experience</p>
<div style="margin-bottom: 4px; class="clonedInput">
Position title: <input type="text"><br /> Years at position:
<input type="number"><br />
Responsibilities: <input type="text"><br />
<input type="text"><br />
Type: <select>
<option>Accounting, banking and Finance</option>
<option>Publishing & Journalism</option>
<option>Social Care & guidance work</option>
</select>
<input type="button" class="btnDel2" value="Remove Experience"
disabled="disabled" />
</div>
<div>
<input type="button" id="btnAdd2" value="add Experience" />
</div>
</form>
Any ideas on how I can fix my script so that when I click the add button for education, a new div containing all of the fields for "education" show up below the previous education box and the same for education?
Any help would be appreciated. Thanks!

Firstly, why do you have 2x $(document).ready? Combine your code into one.
The reason why your duplicated div appear at the end of the form is because both your Education and Experience divs have class="clonedInput", hence $('.clonedInput:last').after(c) causes the duplicated div to be placed after the Experience section (which happens to be the last div that matches the .clonedInput selector).
A solution would to be give each of these sets of divs their own unique class name, such as eduInput and expInput respectively.
The corrected code would hence be:
$('#btnAdd').click(function() {
$('.btnDel:disabled').removeAttr('disabled');
var c = $('.eduInput:first').clone(true);
c.children(':text').attr('name', 'input' + (++inputs));
$('.eduInput:last').after(c);
});
for the education div.
To clean up your code, I suggest binding both Add buttons to the same handler, but act upon them differently by checking the target parameter and determining which set (Education or Experience) to duplicate. Such as:
// single handler and click event for both buttons
var clickHandler = function (e) {
// determine which btnAdd was clicked, such as e.getAttribute('id')
}
$('.btnAdd').click(clickHandler);
But seriously you should clean up your code a little.

Change url based on drop down selection & text box value

I have a very simple form. I'm trying to redirect the page based on dropdown value selected and value entered in the text box.
My form looks like this:
http://devilscircuit.com/new/test.html
It just has a select box, a text box & a submit button. I'm trying to redirect the page once user clicks on submit button.
I'm not very well versed with JavaScript.
Can someone help me with it?
My current JavaScript looks something like this:
<script>
function setURL(){
var dt_value = document.getElementById("dt_id").value;
var dt_value2 = document.getElementById("dt_id2").value;
var sjdurl = "http://parshwatax.com/devilscircuit2/+dt_value2/index.php?
controller=search&search_query="+dt_value;
window.location.href=(sjdurl);
}
</script>
HTML Is below:
<h4 class="title2">Search Your Picture</h4>
<label>Please Select an Event </label>
<select style="width:205px; margin-left:68px;" id="dt_id2">
<option value="shop1">GURGAON'14</option>
<option value="shop2">NOIDA'13</option>
<option value="shop3">LUDHIANA'12</option>
</select> </br>
<label for="dt_id">Please enter your BIB number </label>
<input type="Text" id="dt_id" maxlength="25" size="23" style="margin: 5px 21px;"/> </br>
<input type='button' onclick='setURL()' value='SUBMIT' style="margin: 10px 208px;">
Please help me fix the redirect. THanks in advance.

You have a couple issues. One is your "sjdurl" concatenation has a syntax error. Should be
var sjdurl = "http://parshwatax.com/devilscircuit2/"+dt_value2+"/index.php?
controller=search&search_query="+dt_value;
Another issue is your retrieving the selected value of your "dt_id2" select field incorrectly. It should be like:
var dt_select = document.getElementById("dt_id2");
var dt_value2 = dt_select.options[dt_select.selectedIndex].value;

Disable SUBMIT button until select box choices

I have a small form.
Two select box elements and a submit button.
The select box elements collectively when selections are chosen, fire off an ajax request.
What I want to do is, disable the submit button UNTIL user has made selections from the select drop downs.
They must make a selection from BOTH select drop downs, before the Submit button is enabled.
I dont mind if the submit button is hidden until selections made.
Brief Code:
<form id="ad_form" method="post" action="">
<p>
<select id="ad_type" name="ad_type">
<option value="" selected="selected">Select premium ad type</option>
<option value="<?php echo TYPE_USER;?>">Featured Agent</option>
<option value="<?php echo TYPE_LISTING;?>">Featured Listing</option>
</select>
<label for="ad_type" class="labelStrong">Advertising Type</label>
</p>
<p>
<select id="ad_duration" name="ad_duration">
<option value="" selected="selected">Select premium ad duration</option>
<option value="weekly">Weekly</option>
<option value="fortnightly">Fortnightly</option>
<option value="monthly">Monthy</option>
</select>
<label for="ad_duration" class="labelStrong">Advertising Duration</label>
</p>
<p>
<div id="calender">
</div>
</p>
<p>
<input type="submit" name="submit" value="Submit" id="submitorder" />
</p>
</form>

Here's a demo that seems to do what you want:
http://jsfiddle.net/Yr59d/
That javascript code would go in a $(document).ready() block

$(function() {
$("#submitorder").css("visibility", "hidden");
$("#ad_form select").bind("change", function() {
if ($("#ad_type").val().length > 0 && $("#ad_duration").val().length > 0) {
$("#submitorder").css("visibility", "visible");
} else {
$("#submitorder").css("visibility", "hidden");
}
});
});

If you give all your selects a common class name (like 'required') , you can do something like this:
$('select.required').change(function() {
var total = $('select.required').length;
var selected = $('select.required option:selected').length;
$('#submitorder').attr('disabled', (selected == total));
});
This is not tested code. This documentation might help. This jquery discussion might help too.

Gah, I'll have to agree with Kon on this one - fix-now-worry-about-it-later answers have their place but an elegant solution that is simple at the same time has to be the way to go.
My solution: (with credit from a thread at: JQuery Enable / Disable Submit Button in IE7)
$('select.required').change(function() {
var total = = $('select.required').length;
var selected = $('#ad_form').find("select.required option[value!='':selected").length;
$('#submitorder').prop('disabled', (selected != total));
});
Incidentally, thanks ctcherry for demoing the code on the JSFiddle site - I've not seen that before and will make use of it in the future!

Use listeners on both select buttons for change and check whether the other is also set. If set, enable the submit button.