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JavaScript: Need input element to change options based on entered data

I have a page, where I need to filter through all kinds of data (served as JSON variable) using just pure javascript. Everything works nicely until I try to implement a datalist where the contents of that list are updated in realtime, based on user input.
var data = [{name:"Paul"},{name:"Alex"},{name:"Laura"}] // This is just example object
function updateSearch() {
let search = document.getElementById('search').value;
let options = document.getElementById('searchList');
options.innerHTML = "";
if (search.length >= 2) {
search = search.toLowerCase();
for (let d of data) {
if (d.name.toLowerCase().search(search) === 0) {
options.innerHTML += `
<option>${d.name}</option>
`;
}
}
}
}
<datalist id='searchList'></datalist>
<input type="search" id="search" list='searchList' onchange="updateSearch()">
The goal is to not show the full list of names until at least 2 characters are entered, but it just won't update until the user clicks out focuses back to search input.

One solution to achieve what you require would be to replace the event type that updateSearch() is bound to from onchange to onkeyup:
const data = [
{ name : "Foo" },
{ name : "Bar" },
{ name : "Bing" },
{ name : "Bong" },
{ name : "Boo!" }];
function updateSearch() {
let search = document.getElementById('search').value;
let options = document.getElementById('searchList');
options.innerHTML = "";
if (search.length >= 2) {
search = search.toLowerCase();
for (let d of data) {
if (d.name.toLowerCase().search(search) === 0) {
options.innerHTML += `
<option>${d.name}</option>
`;
}
}
}
}
<datalist id='searchList'></datalist>
<!-- Update to onkeyup -->
<input type="search" id="search" list='searchList' onkeyup="updateSearch()">
Doing this will cause the datalist to interactivly update as the user types. Hope that helps!

How do I change this Contact Form's Javascript so that IF a key is something else, perform different action?

I have a Contact Form that utilizes Google Scripts. It successfully sends the email and formats it decently to my inbox, but there are 2 problems:
-I need it so that IF var key is equal to 'Action', then do not display it in the email it sends. Because right now, "Action send_message" is getting included in the email and I don't like that.
For this, I have unsuccessfully tried things like:
for (var idx in order) {
var key = order[idx];
//Skip this entry into the email output if it is the Action
if( key === 'Action') {
continue
}
It seems to not react to this code at all.
-I also need it so that if a city is selected, e.g. Alachua, that the email says 'Alachua' instead of 'Florida_Alachua'. But I can't add a NAME to an option since apparently options don't have that property. I also can't do the quick fix of changing the VALUE of the <option> to resolve this step, because of other code I have that conflicts with this route.
Google Scripts Code:
/******************************************************************************
* This tutorial is based on the work of Martin Hawksey twitter.com/mhawksey *
* But has been simplified and cleaned up to make it more beginner friendly *
* All credit still goes to Martin and any issues/complaints/questions to me. *
******************************************************************************/
// if you want to store your email server-side (hidden), uncomment the next line
var TO_ADDRESS = "myemail#email.com";
// spit out all the keys/values from the form in HTML for email
// uses an array of keys if provided or the object to determine field order
function formatMailBody(obj, order) {
var result = "";
if (!order) {
order = Object.keys(obj);
}
// loop over all keys in the ordered form data
for (var idx in order) {
var key = order[idx];
result += "<h4 style='text-transform: capitalize; margin-bottom: 0'>" + key + "</h4><div>" + sanitizeInput(obj[key]) + "</div>";
// for every key, concatenate an `<h4 />`/`<div />` pairing of the key name and its value,
// and append it to the `result` string created at the start.
}
return result; // once the looping is done, `result` will be one long string to put in the email body
}
// sanitize content from the user - trust no one
// ref: https://developers.google.com/apps-script/reference/html/html-output#appendUntrusted(String)
function sanitizeInput(rawInput) {
var placeholder = HtmlService.createHtmlOutput(" ");
placeholder.appendUntrusted(rawInput);
return placeholder.getContent();
}
function doPost(e) {
try {
Logger.log(e); // the Google Script version of console.log see: Class Logger
record_data(e);
// shorter name for form data
var mailData = e.parameters;
// names and order of form elements (if set)
var orderParameter = e.parameters.formDataNameOrder;
var dataOrder;
if (orderParameter) {
dataOrder = JSON.parse(orderParameter);
}
// determine recepient of the email
// if you have your email uncommented above, it uses that `TO_ADDRESS`
// otherwise, it defaults to the email provided by the form's data attribute
var sendEmailTo = (typeof TO_ADDRESS !== "undefined") ? TO_ADDRESS : mailData.formGoogleSendEmail;
// send email if to address is set
if (sendEmailTo) {
MailApp.sendEmail({
to: String(sendEmailTo),
subject: "Contact form submitted",
// replyTo: String(mailData.email), // This is optional and reliant on your form actually collecting a field named `email`
htmlBody: formatMailBody(mailData, dataOrder)
});
}
return ContentService // return json success results
.createTextOutput(
JSON.stringify({"result":"success",
"data": JSON.stringify(e.parameters) }))
.setMimeType(ContentService.MimeType.JSON);
} catch(error) { // if error return this
Logger.log(error);
return ContentService
.createTextOutput(JSON.stringify({"result":"error", "error": error}))
.setMimeType(ContentService.MimeType.JSON);
}
}
/**
* record_data inserts the data received from the html form submission
* e is the data received from the POST
*/
function record_data(e) {
var lock = LockService.getDocumentLock();
lock.waitLock(30000); // hold off up to 30 sec to avoid concurrent writing
try {
Logger.log(JSON.stringify(e)); // log the POST data in case we need to debug it
// select the 'responses' sheet by default
var doc = SpreadsheetApp.getActiveSpreadsheet();
var sheetName = e.parameters.formGoogleSheetName || "responses";
var sheet = doc.getSheetByName(sheetName);
var oldHeader = sheet.getRange(1, 1, 1, sheet.getLastColumn()).getValues()[0];
var newHeader = oldHeader.slice();
var fieldsFromForm = getDataColumns(e.parameters);
var row = [new Date()]; // first element in the row should always be a timestamp
// loop through the header columns
for (var i = 1; i < oldHeader.length; i++) { // start at 1 to avoid Timestamp column
var field = oldHeader[i];
var output = getFieldFromData(field, e.parameters);
row.push(output);
// mark as stored by removing from form fields
var formIndex = fieldsFromForm.indexOf(field);
if (formIndex > -1) {
fieldsFromForm.splice(formIndex, 1);
}
}
// set any new fields in our form
for (var i = 0; i < fieldsFromForm.length; i++) {
var field = fieldsFromForm[i];
var output = getFieldFromData(field, e.parameters);
row.push(output);
newHeader.push(field);
}
// more efficient to set values as [][] array than individually
var nextRow = sheet.getLastRow() + 1; // get next row
sheet.getRange(nextRow, 1, 1, row.length).setValues([row]);
// update header row with any new data
if (newHeader.length > oldHeader.length) {
sheet.getRange(1, 1, 1, newHeader.length).setValues([newHeader]);
}
}
catch(error) {
Logger.log(error);
}
finally {
lock.releaseLock();
return;
}
}
function getDataColumns(data) {
return Object.keys(data).filter(function(column) {
return !(column === 'formDataNameOrder' || column === 'formGoogleSheetName' || column === 'formGoogleSendEmail' || column === 'honeypot');
});
}
function getFieldFromData(field, data) {
var values = data[field] || '';
var output = values.join ? values.join(', ') : values;
return output;
}
Contact Form HTML
<section id="contact-form">
<form id="gform"
class="contact-form" method="post"
action="(Google Scripts URL)"
enctype="text/plain">
<p>
<label for="name">Your Name <font face="Arial" color="red">*</font></label>
<input type="text" style="height:35px;" class="heighttext required" name="name" id="name" class="required" title="* Please provide your name">
</p>
<p>
<label>Your Location <font face="Arial" color="red">*</font></label>
<select name="Location" id="column_select" style="height:35px;" class="required" title=" * Please provide your location">
<option selected value="col00">-- State --</option>
<option value="Alabama">Alabama</option>
<option value="California">California</option>
<option value="Florida">Florida</option>
</select>
<select name="City" id="layout_select" style="height:35px;">
<option disabled selected value="Florida">-- City --</option>
<option name="Alachua" value="Florida_Alachua">Alachua</option>
<option name="Alford" value="Florida_Alford">Alford</option>
</select>
</p>
<p>
<input type="submit" value="Send Message" id="submit" class="pp-btn special">
<img src="images/ajax-loader.gif" id="contact-loader" alt="Loading...">
<input type="hidden" name="action" value="send_message">
</p>
</form>
</section><!-- #contact-form -->
Form Handler Javascript
(function() {
function validEmail(email) { // see:
var re = /^([\w-]+(?:\.[\w-]+)*)#((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
return re.test(email);
}
function validateHuman(honeypot) {
if (honeypot) { //if hidden form filled up
console.log("Robot Detected!");
return true;
} else {
console.log("Welcome Human!");
}
}
// get all data in form and return object
function getFormData() {
var form = document.getElementById("gform");
var elements = form.elements;
var fields = Object.keys(elements).filter(function(k) {
return (elements[k].name !== "honeypot");
}).map(function(k) {
if(elements[k].name !== undefined) {
return elements[k].name;
// special case for Edge's html collection
}else if(elements[k].length > 0){
return elements[k].item(0).name;
}
}).filter(function(item, pos, self) {
return self.indexOf(item) == pos && item;
});
var formData = {};
fields.forEach(function(name){
var element = elements[name];
// singular form elements just have one value
formData[name] = element.value;
// when our element has multiple items, get their values
if (element.length) {
var data = [];
for (var i = 0; i < element.length; i++) {
var item = element.item(i);
if (item.checked || item.selected) {
data.push(item.value);
}
}
formData[name] = data.join(', ');
}
});
// add form-specific values into the data
formData.formDataNameOrder = JSON.stringify(fields);
formData.formGoogleSheetName = form.dataset.sheet || "responses"; // default sheet name
formData.formGoogleSendEmail = form.dataset.email || ""; // no email by default
console.log(formData);
return formData;
}
function handleFormSubmit(event) { // handles form submit without any jquery
event.preventDefault(); // we are submitting via xhr below
var data = getFormData(); // get the values submitted in the form
/* OPTION: Remove this comment to enable SPAM prevention, see README.md
if (validateHuman(data.honeypot)) { //if form is filled, form will not be submitted
return false;
}
*/
if( data.email && !validEmail(data.email) ) { // if email is not valid show error
var invalidEmail = document.getElementById("email-invalid");
if (invalidEmail) {
invalidEmail.style.display = "block";
return false;
}
} else {
disableAllButtons(event.target);
var url = event.target.action; //
var xhr = new XMLHttpRequest();
xhr.open('POST', url);
// xhr.withCredentials = true;
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.onreadystatechange = function() {
console.log( xhr.status, xhr.statusText )
console.log(xhr.responseText);
//document.getElementById("gform").style.display = "none"; // hide form
/*
var thankYouMessage = document.getElementById("thankyou_message");
if (thankYouMessage) {
thankYouMessage.style.display = "block";
}
*/
return;
};
// url encode form data for sending as post data
var encoded = Object.keys(data).map(function(k) {
return encodeURIComponent(k) + "=" + encodeURIComponent(data[k])
}).join('&')
xhr.send(encoded);
}
}
function loaded() {
console.log("Contact form submission handler loaded successfully.");
// bind to the submit event of our form
var form = document.getElementById("gform");
form.addEventListener("submit", handleFormSubmit, false);
};
document.addEventListener("DOMContentLoaded", loaded, false);
function disableAllButtons(form) {
var buttons = form.querySelectorAll("button");
for (var i = 0; i < buttons.length; i++) {
buttons[i].disabled = true;
}
}
})();
finally, this is the extra code that would break if I simply tried changing the value of option to, e.g., 'Alachua' instead of 'Flordia_Alachua'. https://jsfiddle.net/hmatt843/504dgmqy/19/
Thanks for any and all help.

Try console.log(key) before if( key === 'Action'). I think you'll find that key never equals 'Action', exactly. Looks like you'll need if( key === 'action'), instead.
If you wish to remove part of string value, try the replace method: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace
It also looks like you're trying to work with elements[k].name when you mean to be working with elements[k].value.
I believe your code should look something like...
function(k) {
if(elements[k].value !== undefined) {
return elements[k].value.replace('Florida_', '');
// special case for Edge's html collection
} else if(elements[k].length > 0){
return elements[k].item(0).value.replace('Florida_', '');
}
}
... or something to that effect.
In the future, you may want to make it easier for folks trying to help you by posting only the portions of code your having trouble with, and breaking your questions into different posts. A lot to sift through up there.
Hope this helped.

The split() method splits a String object into an array of strings by separating the string into substrings, using a specified separator string to determine where to make each split.
Var splitValue = elements[k].item(0).value.split("");
splitValue[1] will give you a string of characters after the delimeter () in this case.

how to build a valid url inside my javascript

I have the following JavaScript which build url paramters based on users input:-
$(document).ready(function(){
$('#button').click(function(e) {
var count=1;
var s="";
var inputvalue = $("#journal").val();
var inputvalue2 = $("#keywords").val();
var inputvalue3 = $("#datepub").val();
var inputvalue4 = $("#title").val();
var inputvalue5 = $("#localcurrency").val();
var inputvalue6 = $("#locations").val();
var inputvalue7 = $("#dropdown1").val();
var inputvalue8 = $("#dropdown2").val();
if(inputvalue!=null && inputvalue!="")
{
s = s+ "FilterField"+count+"=Journal&FilterValue"+count+"="+inputvalue+"&";
count++;
}
if(inputvalue2!=null && inputvalue2!="")
{
s = s+ "FilterField"+count+"=KeyWords&FilterValue"+count+"="+inputvalue2+"&";
count++;
}
if(inputvalue3!=null && inputvalue3!="")
{
s = s+ "FilterField"+count+"=datepub&FilterValue"+count+"="+inputvalue3+"&";
count++;
}
if(inputvalue4!=null && inputvalue4!="")
{
s = s+ "FilterField"+count+"=Title&FilterValue"+count+"="+inputvalue4+"&";
count++;
}
if(inputvalue5!=null && inputvalue5!="")
{
s = s+ "FilterField"+count+"=localcurrency&FilterValue"+count+"="+inputvalue5+"&";
count++;
}
if(inputvalue6!=null && inputvalue6!="")
{
s = s+ "FilterField"+count+"=locations&FilterValue"+count+"="+inputvalue6+"&";
count++;
}
if(inputvalue7!=null && inputvalue7!="")
{
s = s+ "FilterField"+count+"=dropdown1&FilterValue"+count+"="+inputvalue7+"&";
count++;
}
if(inputvalue8!=null && inputvalue8!="")
{
s = s+ "FilterField"+count+"=dropdown2&FilterValue"+count+"="+inputvalue8+"&";
count++;
}
window.location.replace("/teamsites/Bib%20Test/Forms/search.aspx?"+s);
});
});
</script>
now the above script will generate URLs such as
http://***/teamsites/Bib%20Test/Forms/search.aspx?FilterField1=Journal&FilterValue1=123
http://***/teamsites/Bib%20Test/Forms/search.aspx?FilterField1=Journal&FilterValue1=123&FilterField2=localcurrency&FilterValue2=USD&
and thing were working well, till i tried passing a search parameter which contain &. for example i wanted to search for a record which have their journal = General&Procedure, so using my above code, the URL will be as follow:-
http://***/teamsites/Bib%20Test/Forms/search.aspx?FilterField1=Journal&FilterValue1=General&Procedure&
and i did not get any result,, as the application assume that the Procudure is a parameter and not part of the FilterValue1.. now to fix this specific problem, i define to build the URL parameters with encodeURIComponent() function as follow:-
var inputvalue = encodeURIComponent($("#journal").val());
var inputvalue2 = encodeURIComponent($("#keywords").val());
var inputvalue3 = encodeURIComponent($("#datepub").val());
var inputvalue4 = encodeURIComponent($("#title").val());
var inputvalue5 = encodeURIComponent($("#localcurrency").val());
var inputvalue6 = encodeURIComponent($("#locations").val());
var inputvalue7 = encodeURIComponent($("#dropdown1").val());
var inputvalue8 = encodeURIComponent($("#dropdown2").val());
now the generated URL will be as follow:-
http://***teamsites/Bib%20Test/Forms/search.aspx?FilterField1=Journal&FilterValue1=General%26Procedure
and i got the expected results..
but not sure if using encodeURIComponent() to only encode the parameter values is a valid fix,, as seems i will be encoding the & if it is part of the query string parameter,, but still the url contain non-encoded & which separate the url parameters .. now the result i got from the last url is correct.. but not sure if i am doing things correctly ? and is there a built-in function to do this work for me ??
Thanks

Here are sources for URL syntax:
Easily understandable and authoritative enough:
Components: https://en.wikipedia.org/wiki/Uniform_Resource_Identifier#Syntax
Query component: https://en.wikipedia.org/wiki/Query_string
Percent-encoding of non-allowed characters: https://en.wikipedia.org/wiki/Percent-encoding
Uniform Resource Identifier (URI): Generic Syntax (RFC 3986) https://www.rfc-editor.org/rfc/rfc3986
Components: https://www.rfc-editor.org/rfc/rfc3986#section-3
Query component: https://www.rfc-editor.org/rfc/rfc3986#section-3.4
Percent-encoding: https://www.rfc-editor.org/rfc/rfc3986#section-2.1
You will notice that the exact content of the query component is not standardized. Its simple definition is:
The query component is indicated by the first question
mark ("?") character and terminated by a number sign ("#") character
or by the end of the URI.
However, the de-facto standard is to use ampersand (&) character as delimiter. With this convention, anytime this character also appears in your data and is not meant to be a delimiter, you have to "percent-encode" it, as per the standard as well:
A percent-encoding mechanism is used to represent a data octet in a component when that octet's corresponding character is outside the allowed set or is being used as a delimiter of, or within, the
component.
You will easily understand that other special characters, like =, % and # must also be percent-encoded, should they appear in your data. There is no harm in encoding even more special characters as well.
Therefore if you follow this convention, your query component should be of the form:
?field1=value1&field2=value2
with each field and value being percent-encoded. In JavaScript, you can indeed conveniently use the encodeURIComponent function. Do not forget to encode the fields as well!
Furthermore, as your use case is very common, there are plenty libraries available that can handle such conversion for you, e.g. URI.js.
But since you mention using jQuery, you can conveniently use jQuery.param to do the conversion:
Create a serialized representation of an array, a plain object, or a jQuery object suitable for use in a URL query string or Ajax request. In case a jQuery object is passed, it should contain input elements with name/value properties.
$(document).ready(function() {
$('#button').click(retrieveInputsValues);
retrieveInputsValues();
});
function retrieveInputsValues() {
var inputIds = [
'Journal',
'KeyWords',
'datepub',
'Title',
'localcurrency',
'locations',
'dropdown1',
'dropdown2'
];
var obj = {};
var count = 1;
var value;
for (var i = 0; i < inputIds.length; i += 1) {
value = $('#' + inputIds[i].toLowerCase()).val();
if (value !== null && value !== '') {
obj['FilterField' + count] = inputIds[i];
obj['FilterValue' + count] = value;
count += 1;
}
}
console.log($.param(obj));
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
Journal
<input type="text" id="journal" value="test & ampersand, comma, % percent, = equal and space" />
<br />keywords <input type="text" id="keywords" />
<br />datepub
<select id="datepub">
<option value=""></option>
<option value="1950">1950</option>
<option value="2010">2010</option>
<option value="2017" selected>2017</option>
<option value="audi">Audi</option>
</select>
<br />title
<select id="title">
<option value=""></option>
<option value="TestDoc">test doc</option>
<option value="t">t</option>
</select>
<br />localcurrency
<select id="localcurrency">
<option value=""></option>
<option value="USD">USD</option>
</select>
<br />locations
<select id="locations">
<option value=""></option>
<option value="US">US</option>
<option value="UK">UK</option>
</select>
<br />dropdown1
<select id="dropdown1">
<option value=""></option>
<option value="a">a</option>
<option value="b">b</option>
</select>
<br />dropdown2
<select id="dropdown2">
<option value=""></option>
<option value="aa">aa</option>
<option value="bb">bb</option>
<option value="cc">cc</option>
<option value="dd">dd</option>
</select>
<br />
<button type="button" id="button">search</button>
<!-- re-used from https://stackoverflow.com/a/47008115/5108796 -->
BTW, usually there is no need to pass the field names as values, just "field=value" is used.
But you may have specific use case for your back-end processing?

Extending my comment as an answer.
Using encodeURIComponent is not only valid and correct, it is actually the only fix for supporting special characters in values in URL which have special meaning for a URL.
Encoding the values in URL component is important for prevent XSS attacks as well. Have a look here
URL-escaping is susceptible to double-escaping, meaning you must
URL-escape its parts exactly once. It is best to perform the
URL-escaping at the time the URL is being assembled.
However, you can improve your code in the following manner
var inputs = [ "#journal", "#keywords", "#datepub", "#title", "#localcurrency", "#locations", "#dropdown1", "#dropdown2" ];
$(document).ready(function(){
$('#button').click(function(e) {
var count = 1;
var searchParams = inputs.filter( function( id ){
return $( "#" + id ).val().trim().length > 0;
}).map( function( id ){
var value = encodeURIComponent( $( "#" + id ).val().trim() );
return "FilterField" + (count) + "=" + id + "&FilterValue" + (count++) + "=" + value;
}).join( "&" );
window.location.replace("/teamsites/Bib%20Test/Forms/search.aspx?"+ searchParams );
});
});
Alternatively, you can also use URL (though not supported in IE)
var inputs = [ "#journal", "#keywords", "#datepub", "#title", "#localcurrency", "#locations", "#dropdown1", "#dropdown2" ];
$(document).ready(function(){
$('#button').click(function(e) {
var count = 1;
var url = new URL( "/teamsites/Bib%20Test/Forms/search.aspx?", window.location.origin );
inputs.forEach( function( id ){
var value = encodeURIComponent( $( "#" + id ).val().trim() );
if ( value.length > 0 )
{
url.searchParams.append( "FilterField" + count, id );
url.searchParams.append( "FilterValue" + (count++), value );
}
});
window.location.replace( url.href );
});
});
As you can see that in this approach as well, you will have to use encodeURIcomponent since as per spec
The append(name, value) method, when invoked, must run these steps:
Append a new name-value pair whose name is name and value is value, to
list.
Run the update steps.
there is no guarantee that encoding will be done. So, the explicit encoding necessary!!.

/!\ THIS IS NOT AN ANSWER
In relation with comments
const [
$("#journal").val(),
$("#keywords").val(),
$("#datepub").val(),
$("#title").val(),
// ...
].forEach((x) => {
if (x !== null && x !== '') {
s += ...;
count += 1;
}
});

I use encodeUriComponent for this.
url += "&filter=" + encodeURIComponent(filter);
You want '&' inside the parameter value to be encoded, so you use 'encodeURIComponent' on the value of the parameter, but you don't want to encode the stuff between parameters.

Use this if you are not concerned about Internet Explorer or Edge.
I would recommend to use browser's URL API instead. It is stable and is available in most of the modern browsers to deal with URL specific work natively.
Your code can be changed as follows to use this API. It automatically encodes all the required parameters as per the specs. You don't need to deal with the query parameters manually.
$(document).ready(function() {
$('#button').click(function(e) {
var count = 1;
var s = "";
var url = new URL("http://yourhost.com/teamsites/Bib%20Test/Forms/search.aspx");
var inputvalue = $("#journal").val();
var inputvalue2 = $("#keywords").val();
var inputvalue3 = $("#datepub").val();
var inputvalue4 = $("#title").val();
var inputvalue5 = $("#localcurrency").val();
var inputvalue6 = $("#locations").val();
var inputvalue7 = $("#dropdown1").val();
var inputvalue8 = $("#dropdown2").val();
if (inputvalue != null && inputvalue != "") {
url.searchParams.set("FilterField" + count, "Journal");
url.searchParams.set("FilterValue" + count, inputvalue);
count++;
}
if (inputvalue2 != null && inputvalue2 != "") {
url.searchParams.set("FilterField" + count, "KeyWords");
url.searchParams.set("FilterValue" + count, inputvalue2);
count++;
}
if (inputvalue3 != null && inputvalue3 != "") {
url.searchParams.set("FilterField" + count, "datepub");
url.searchParams.set("FilterValue" + count, inputvalue3);
count++;
}
if (inputvalue4 != null && inputvalue4 != "") {
url.searchParams.set("FilterField" + count, "Title");
url.searchParams.set("FilterValue" + count, inputvalue4);
count++;
}
if (inputvalue5 != null && inputvalue5 != "") {
url.searchParams.set("FilterField" + count, "localcurrency");
url.searchParams.set("FilterValue" + count, inputvalue5);
count++;
}
if (inputvalue6 != null && inputvalue6 != "") {
url.searchParams.set("FilterField" + count, "locations");
url.searchParams.set("FilterValue" + count, inputvalue6);
count++;
}
if (inputvalue7 != null && inputvalue7 != "") {
url.searchParams.set("FilterField" + count, "dropdown1");
url.searchParams.set("FilterValue" + count, inputvalue7);
count++;
}
if (inputvalue8 != null && inputvalue8 != "") {
url.searchParams.set("FilterField" + count, "dropdown2");
url.searchParams.set("FilterValue" + count, inputvalue8);
count++;
}
window.location.replace(url.href);
});
});
In addition to it, I recommend to incorporate the suggestions from #GrégoryNEUT, as it makes the code concise and easy to read.

Pdf.js: how to get input radio values?

I use pdf.js library to generate html5 page from pdf but some capabilities not working. I try to get value for input radio but still abortively:(
For example, in core.js script there are a few lines of code that take type of field:
var fieldType = getInheritableProperty(annotation, 'FT');
if (!isName(fieldType))
break;
item.fieldType = fieldType.name;
How I can get feild value?

I found the solution that work form me!
Add this code around line 260 of core.js file:
function setRadioButton(annotation, item) {
var ap = annotation.get('AP');
var nVal = ap.get('N');
var i = 0;
nVal.forEach(function(key, value){
i++;
if(i == 1 || i == 2) {
if(key != 'Off')
item.value = key;
}
});
}
And this code around line 370 of core.js file:
if (item.fieldType == 'Btn') {
if (item.flags & 32768) {
setRadioButton(annotation, item);
}
}
Also, if you want to get values from select input, you can use this code:
if(item.fieldType == 'Ch') {
item.value = annotation.get('Opt') || []; //return array of values
}

Generic way to detect if html form is edited

I have a tabbed html form. Upon navigating from one tab to the other, the current tab's data is persisted (on the DB) even if there is no change to the data.
I would like to make the persistence call only if the form is edited. The form can contain any kind of control. Dirtying the form need not be by typing some text but choosing a date in a calendar control would also qualify.
One way to achieve this would be to display the form in read-only mode by default and have an 'Edit' button and if the user clicks the edit button then the call to DB is made (once again, irrespective of whether data is modified. This is a better improvement to what is currently existing).
I would like to know how to write a generic javascript function that would check if any of the controls value has been modified ?

In pure javascript, this would not be an easy task, but jQuery makes it very easy to do:
$("#myform :input").change(function() {
$("#myform").data("changed",true);
});
Then before saving, you can check if it was changed:
if ($("#myform").data("changed")) {
// submit the form
}
In the example above, the form has an id equal to "myform".
If you need this in many forms, you can easily turn it into a plugin:
$.fn.extend({
trackChanges: function() {
$(":input",this).change(function() {
$(this.form).data("changed", true);
});
}
,
isChanged: function() {
return this.data("changed");
}
});
Then you can simply say:
$("#myform").trackChanges();
and check if a form has changed:
if ($("#myform").isChanged()) {
// ...
}

I am not sure if I get your question right, but what about addEventListener? If you don't care too much about IE8 support this should be fine. The following code is working for me:
var form = document.getElementById("myForm");
form.addEventListener("input", function () {
console.log("Form has changed!");
});

In case JQuery is out of the question. A quick search on Google found Javascript implementations of MD5 and SHA1 hash algorithms. If you wanted, you could concatenate all form inputs and hash them, then store that value in memory. When the user is done. Concatenate all the values and hash again. Compare the 2 hashes. If they are the same, the user did not change any form fields. If they are different, something has been edited, and you need to call your persistence code.

Another way to achieve this is serialize the form:
$(function() {
var $form = $('form');
var initialState = $form.serialize();
$form.submit(function (e) {
if (initialState === $form.serialize()) {
console.log('Form is unchanged!');
} else {
console.log('Form has changed!');
}
e.preventDefault();
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
Field 1: <input type="text" name="field_1" value="My value 1"> <br>
Field 2: <input type="text" name="field_2" value="My value 2"> <br>
Check: <input type="checkbox" name="field_3" value="1"><br>
<input type="submit">
</form>

Form changes can easily be detected in native JavaScript without jQuery:
function initChangeDetection(form) {
Array.from(form).forEach(el => el.dataset.origValue = el.value);
}
function formHasChanges(form) {
return Array.from(form).some(el => 'origValue' in el.dataset && el.dataset.origValue !== el.value);
}
initChangeDetection() can safely be called multiple times throughout your page's lifecycle: See Test on JSBin
For older browsers that don't support newer arrow/array functions:
function initChangeDetection(form) {
for (var i=0; i<form.length; i++) {
var el = form[i];
el.dataset.origValue = el.value;
}
}
function formHasChanges(form) {
for (var i=0; i<form.length; i++) {
var el = form[i];
if ('origValue' in el.dataset && el.dataset.origValue !== el.value) {
return true;
}
}
return false;
}

Here's how I did it (without using jQuery).
In my case, I wanted one particular form element not to be counted, because it was the element that triggered the check and so will always have changed. The exceptional element is named 'reporting_period' and is hard-coded in the function 'hasFormChanged()'.
To test, make an element call the function "changeReportingPeriod()", which you'll probably want to name something else.
IMPORTANT: You must call setInitialValues() when the values have been set to their original values (typically at page load, but not in my case).
NOTE: I do not claim that this is an elegant solution, in fact I don't believe in elegant JavaScript solutions. My personal emphasis in JavaScript is on readability, not structural elegance (as if that were possible in JavaScript). I do not concern myself with file size at all when writing JavaScript because that's what gzip is for, and trying to write more compact JavaScript code invariably leads to intolerable problems with maintenance. I offer no apologies, express no remorse and refuse to debate it. It's JavaScript. Sorry, I had to make this clear in order to convince myself that I should bother posting. Be happy! :)
var initial_values = new Array();
// Gets all form elements from the entire document.
function getAllFormElements() {
// Return variable.
var all_form_elements = Array();
// The form.
var form_activity_report = document.getElementById('form_activity_report');
// Different types of form elements.
var inputs = form_activity_report.getElementsByTagName('input');
var textareas = form_activity_report.getElementsByTagName('textarea');
var selects = form_activity_report.getElementsByTagName('select');
// We do it this way because we want to return an Array, not a NodeList.
var i;
for (i = 0; i < inputs.length; i++) {
all_form_elements.push(inputs[i]);
}
for (i = 0; i < textareas.length; i++) {
all_form_elements.push(textareas[i]);
}
for (i = 0; i < selects.length; i++) {
all_form_elements.push(selects[i]);
}
return all_form_elements;
}
// Sets the initial values of every form element.
function setInitialFormValues() {
var inputs = getAllFormElements();
for (var i = 0; i < inputs.length; i++) {
initial_values.push(inputs[i].value);
}
}
function hasFormChanged() {
var has_changed = false;
var elements = getAllFormElements();
for (var i = 0; i < elements.length; i++) {
if (elements[i].id != 'reporting_period' && elements[i].value != initial_values[i]) {
has_changed = true;
break;
}
}
return has_changed;
}
function changeReportingPeriod() {
alert(hasFormChanged());
}

Here's a polyfill method demo in native JavaScript that uses the FormData() API to detect created, updated, and deleted form entries. You can check if anything was changed using HTMLFormElement#isChanged and get an object containing the differences from a reset form using HTMLFormElement#changes (assuming they're not masked by an input name):
Object.defineProperties(HTMLFormElement.prototype, {
isChanged: {
configurable: true,
get: function isChanged () {
'use strict'
var thisData = new FormData(this)
var that = this.cloneNode(true)
// avoid masking: https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/reset
HTMLFormElement.prototype.reset.call(that)
var thatData = new FormData(that)
const theseKeys = Array.from(thisData.keys())
const thoseKeys = Array.from(thatData.keys())
if (theseKeys.length !== thoseKeys.length) {
return true
}
const allKeys = new Set(theseKeys.concat(thoseKeys))
function unequal (value, index) {
return value !== this[index]
}
for (const key of theseKeys) {
const theseValues = thisData.getAll(key)
const thoseValues = thatData.getAll(key)
if (theseValues.length !== thoseValues.length) {
return true
}
if (theseValues.some(unequal, thoseValues)) {
return true
}
}
return false
}
},
changes: {
configurable: true,
get: function changes () {
'use strict'
var thisData = new FormData(this)
var that = this.cloneNode(true)
// avoid masking: https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/reset
HTMLFormElement.prototype.reset.call(that)
var thatData = new FormData(that)
const theseKeys = Array.from(thisData.keys())
const thoseKeys = Array.from(thatData.keys())
const created = new FormData()
const deleted = new FormData()
const updated = new FormData()
const allKeys = new Set(theseKeys.concat(thoseKeys))
function unequal (value, index) {
return value !== this[index]
}
for (const key of allKeys) {
const theseValues = thisData.getAll(key)
const thoseValues = thatData.getAll(key)
const createdValues = theseValues.slice(thoseValues.length)
const deletedValues = thoseValues.slice(theseValues.length)
const minLength = Math.min(theseValues.length, thoseValues.length)
const updatedValues = theseValues.slice(0, minLength).filter(unequal, thoseValues)
function append (value) {
this.append(key, value)
}
createdValues.forEach(append, created)
deletedValues.forEach(append, deleted)
updatedValues.forEach(append, updated)
}
return {
created: Array.from(created),
deleted: Array.from(deleted),
updated: Array.from(updated)
}
}
}
})
document.querySelector('[value="Check"]').addEventListener('click', function () {
if (this.form.isChanged) {
console.log(this.form.changes)
} else {
console.log('unchanged')
}
})
<form>
<div>
<label for="name">Text Input:</label>
<input type="text" name="name" id="name" value="" tabindex="1" />
</div>
<div>
<h4>Radio Button Choice</h4>
<label for="radio-choice-1">Choice 1</label>
<input type="radio" name="radio-choice-1" id="radio-choice-1" tabindex="2" value="choice-1" />
<label for="radio-choice-2">Choice 2</label>
<input type="radio" name="radio-choice-2" id="radio-choice-2" tabindex="3" value="choice-2" />
</div>
<div>
<label for="select-choice">Select Dropdown Choice:</label>
<select name="select-choice" id="select-choice">
<option value="Choice 1">Choice 1</option>
<option value="Choice 2">Choice 2</option>
<option value="Choice 3">Choice 3</option>
</select>
</div>
<div>
<label for="textarea">Textarea:</label>
<textarea cols="40" rows="8" name="textarea" id="textarea"></textarea>
</div>
<div>
<label for="checkbox">Checkbox:</label>
<input type="checkbox" name="checkbox" id="checkbox" />
</div>
<div>
<input type="button" value="Check" />
</div>
</form>

I really like the contribution from Teekin above, and have implemented it.
However, I have expanded it to allow for checkboxes too using code like this:
// Gets all form elements from the entire document.
function getAllFormElements() {
// Return variable.
var all_form_elements = Array();
// The form.
var Form = document.getElementById('frmCompDetls');
// Different types of form elements.
var inputs = Form.getElementsByTagName('input');
var textareas = Form.getElementsByTagName('textarea');
var selects = Form.getElementsByTagName('select');
var checkboxes = Form.getElementsByTagName('CheckBox');
// We do it this way because we want to return an Array, not a NodeList.
var i;
for (i = 0; i < inputs.length; i++) {
all_form_elements.push(inputs[i]);
}
for (i = 0; i < textareas.length; i++) {
all_form_elements.push(textareas[i]);
}
for (i = 0; i < selects.length; i++) {
all_form_elements.push(selects[i]);
}
for (i = 0; i < checkboxes.length; i++) {
all_form_elements.push(checkboxes[i]);
}
return all_form_elements;
}
// Sets the initial values of every form element.
function setInitialFormValues() {
var inputs = getAllFormElements();
for (var i = 0; i < inputs.length; i++) {
if(inputs[i].type != "checkbox"){
initial_values.push(inputs[i].value);
}
else
{
initial_values.push(inputs[i].checked);
}
}
}
function hasFormChanged() {
var has_changed = false;
var elements = getAllFormElements();
var diffstring = ""
for (var i = 0; i < elements.length; i++) {
if (elements[i].type != "checkbox"){
if (elements[i].value != initial_values[i]) {
has_changed = true;
//diffstring = diffstring + elements[i].value+" Was "+initial_values[i]+"\n";
break;
}
}
else
{
if (elements[i].checked != initial_values[i]) {
has_changed = true;
//diffstring = diffstring + elements[i].value+" Was "+initial_values[i]+"\n";
break;
}
}
}
//alert(diffstring);
return has_changed;
}
The diffstring is just a debugging tool