Develop Reference

Second input box in form doesn't work second time

I have this form:
<form id="addChore" method="post" action="allocate.php">
<label>Name of new chore:</label>
<input type="text" id = "choreName" name="choreName">
<p></p>
<label>Description:</label>
<input type="text" id="description" name="description">
<p></p>
<label>Frequency:</label>
<select id="frequency" name="frequency">
...
</select>
<input type="submit" value="Submit">
</form>
and this jQuery
$(document).ready(function(){
$("#addChore").on('submit',function(e){
e.preventDefault();
$("#error").empty();
var name = $("#choreName").val();
console.log(name);
var description = $("#description").val();
console.log(description);
var frequency = $("#frequency").val();
console.log(frequency);
var message=("Please fill all fields");
// $('#addChore')[0].reset();
if (!name || !description){
$("#error").append("<p>"+message+"</p>");
return false;
}
else{...}
but when I try and use the form a second time, description is empty in the log, while name and frequency accept a new input. I have tried resets and .val("") but nothing seems to change this. Any help? :/

Turns out I had another element with the same id, but defined in php in a separate script

Javascript concat clearing input fields

function js() {
document.getElementById("example").innerHTML = document.getElementById("example").innerHTML+"<input type=\"text\" name=\"name\" />";
}
<div id="example">
<input type="text" name="name[]" />
</div>
<button type="button" onclick="js();">Click</button>
I have a form, which need variable number of input types.
<form action="" method="">
[...]
<div id="mezok">
<div id="input_id">
<input type="text" name="name" />
</div>
</div>
[...]
</form>
I add and remove further inputs (along with their divs!) via an ajax call. Javascript calls a php which generates a new input_id div, and then concatenates to the rest of the div id="mezok". Adding and removing inputs are fine as long as everything is empty. However, when I add a new div when there is something in the input, it clears the rest of the inputs.
document.getElementById("mezok").innerHTML = document.getElementById("mezok").innerHTML+http.responseText;
document.getElementById("mezok").innerHTML += http.responseText;
document.getElementById("mezok").innerHTML.concat(http.responseText);
(The last one is not working at all...)
TL;DR: concat input to input, values of inputs disappear. :'(

Don't use innerHTML. What you are doing is redrawing the entire container contents, deleting existent inputs and creating new inputs each time. My experience says that when you are accessing innerHTML, recheck your code as you are probably doing something weird.
What you have to do is to create inputs individually and append them to the container, without touching the rest of the inputs. Is like appending elements to an array.
This way the code is more self-explanatory, and better, is way more performant:
function js() {
var input = document.createElement("input"); // Create a new input element. Is like "<input>".
input.setAttribute("type", "text"); // Set the 'type' attribute to 'text'. Is like having '<input type="text">'
input.setAttribute("name", "name[]"); // Set the 'name' attribute to 'name[]'. Is like having '<input name="name[]">' but because you already have set the type, now is like having '<input type="text" name="name[]">'
document.getElementById("example").appendChild(input); // Push it to the container
}
<div id="example">
<input type="text" name="name[]" />
</div>
<button type="button" onclick="js();">Click</button>

The code below could be a solution for you. In this way you're not going to overwrite the existing inputs with the associated values while you're adding new inputs.
function js() {
var inputElementToAppend = document.createElement('input');
inputElementToAppend.innerHTML = "<input type=\"text\" name=\"name\" />";
document.getElementById("example").appendChild(inputElementToAppend.firstChild);
}
<div id="example">
<input type="text" name="name[]" />
</div>
<button type="button" onclick="js();">Click</button>
Let me know if this worked for you.

Following working fine for me.
<button onclick="myFunction()">Try it</button>
<p id="demo">ABC</p>
<script>
function myFunction() {
var x = document.getElementById("myP").innerHTML;
document.getElementById("demo").innerHTML += `<input type=\"text\" name=\"name\" />`;
}
<script>
I would recommend to use appendChild and removeChild instead of innerHTML

How do i create a simple Javascript Program that displays the value of <input type="text">?

I am new to javascript, and i only know c++ so far, but i know the logic but i just don't know the syntax on javascript
so i have this form :
<span>Please type your name here: </span>
<input id="inputname" type="text" value=""></input>
when the user types his/her name how do i save the value to some variable and display it with javascript?
i have already tried using
function displayName(){
var username = getElementById("inputname").value;
document.write(username);
}
and i put
<script>displayName();</script>
below the form. it doesn't seem to work, how do i do it?
and how do i use:
<input type="submit"></input>
in relation to it?

Try this,
Javascript
function displayName(){
var username = document.getElementById("inputname").value;
document.getElementById("msg").innerHTML = username;
}
HTML
<span>Please type your name here: </span>
<input id="inputname" type="text" value=""></input>
<input type="button" onclick="displayName();"></input>
<span id="msg"></span>
By changing onclick="return displayName()" to onkeypress="displayName()" you will be able to see the changes on the spot.

change your html and js like this. onblur function call when user leaves the input from focus. get the enter value onblur
<span>Please type your name here: </span>
<input id="inputname" type="text" onblur="displayName();" value=""></input>
js
function displayName(){
var username = document.getElementById("inputname").value;
document.write(username);
}

you need to change your fucntion little bit..
getElementById() is not a direct function in javascript..use it with document object
function displayName(){
var username = document.getElementById("inputname").value;
document.getElementById("msg").innerHTML = username;
return false;
}
on submit click
<input type="submit" id="btnSave" onclick="return displayName();" value="Save" />
<div id="msg" > </div>

Populating a tag input based on other inputs in same form

I have a form with a bunch of inputs. Sometimes the form will have 1 input and sometimes up to 10 inputs. When someone fills out each input I want a tag field at the bottom to be populated also. Right now I have it working but only with a set number of inputs. (3 at the moment).
Im trying to figure out how to make it work regardless of how many inputs there are on the page.
HTML
Input1 <input id="input1" name="input1" type="text" value="" />
<br/>
Input2 <input id="input2" name="input2" type="text" value="" />
<br/>
Input3 <input id="input3" name="input3" type="text" value="" />
<br/>
<p>List of inputed text</p>
<span id="allInputs"></span>
Jquery
$("#input1,#input2,#input3").change(function () {
var inputArray = [$("#input1").val(), $("#input2").val(), $("#input3").val()];
$("#allInputs").text(inputArray.join(' '));
});
A nice to have also would be putting them into another input instead of a span and adding a comma after each one except for the last one.
I know Im probably missing something very simple here.

In your example you are only allowing for 3 inputs as you have 3 input boxes, when any of those input boxes change your tags are then being transferred to the span.
Now it sounds like you wish to allow for multiple entries regardless of how many inputs. You could try something simple such as the below fiddle.
http://jsfiddle.net/K2g4z/
Html:
<div>
<strong>Enter your tag and click add</strong>
<br/>
<input type="text" id="tagEntry" />
<button id="tagAdd">Add</button>
</div>
<div>
<strong>Entered Tags</strong>
<br/>
<input type="text" id="tagsEntered" />
</div>
Javascript:
var tags = [];
$(function() {
$('#tagAdd').click(function(){
//get the tag value and trim the spaces
var tVal = $('#tagEntry').val().trim();
if(tVal == '')
return;
//reset the entry box
$('#tagEntry').val('');
//verify tag not already saved
for(var i=0;i<tags.length;i++)
if(tags[i] == tVal)
return;
//add the tag to the array
tags.push(tVal);
//set the tags entry box
$('#tagsEntered').val(tags.join(', '));
});
});
UPDATE:
The JSFiddle link http://jsfiddle.net/K2g4z/1/ now supports using multiple inputs of as many as you need. To achieve this instead of selecting on element ID we bind to a class name. Given the following Html.
<div>
<strong>Enter your tag and click add</strong>
<br/>
<strong>Tag 1</strong>
<input type="text" id="tagEntry" class="tagEntry" />
<br/>
<strong>Tag 2</strong>
<input type="text" class="tagEntry" />
<br/>
<strong>Tag 3</strong>
<input type="text" class="tagEntry" />
<br/>
<strong>Tag 4</strong>
<input type="text" class="tagEntry" />
<br/>
<strong>Tag 5</strong>
<input type="text" class="tagEntry" />
</div>
<div>
<strong>Entered Tags</strong>
<br/>
<input type="text" id="tagsEntered" />
</div>
All the tag input boxes have a class of tagEntry now this class will become our selector. With the following JS we can bind the blur event to every tag that has a class of tagEntry. This will now update the tags box every time any of the inputs changed.
var tags = [];
$(function() {
$('.tagEntry').blur(function(){
//get the tag value and trim the spaces
var tVal = $(this).val().trim();
if(tVal == '')
return;
//reset the entry box
$(this).val('');
//verify tag not already saved
for(var i=0;i<tags.length;i++)
if(tags[i] == tVal)
return;
//add the tag to the array
tags.push(tVal);
//set the tags entry box
$('#tagsEntered').val(tags.join(', '));
});
});
As you can see our handler binds to all the inputs, as any of the inputs receives the blur event the method of extracting the tags is executed.

$("#input1,#input2,#input3").change(function () {
var inputArray = [$("#input1").val(), $("#input2").val(), $("#input3").val()];
$("#masterinput").val(inputArray.join(' '));
});

You probably want to narrow the selector so it isn't selecting all text inputs on the page.
var inputs$ = $("input:text").change(function () {
var inputArray = [];
$.each(inputs$, function(i, v) {
inputArray.push($(v).val());
}
$("#allInputs").text(inputArray.join(' '));
});

Here you go:
var str = "";
$("input[type=text]").change(function () {
$("input[type=text]").each(function(){
str += $(this).val()+",";
};
});
$("#allInputs").html(str);

How to manipulate Get query?

I have the following form from http://regain.sourceforge.net/:
<form name="search" action="search.jsp" method="get">
<p class="searchinput">
<b>Suchen nach: </b>
<input name="query" size="30"/>
<select name="order" size="1" ><option selected value="relevance_desc">Relevanz</option><option value="last-modified_asc">Dokumentendatum aufsteigend</option><option value="last-modified_desc">Dokumentendatum absteigend</option</select>
<input type="submit" value="Suchen"/>
</p>
</form>
the search form works fine. The URL looks like the following:
http://localhost:8080/regain/search.jsp?query=queryfieldvalue&order=relevance_desc
Now I want to add a checkbox to manipulate the value of the input field query.
If the checkbox is checked then the query value should look like filename:"queryfieldvalue"
http://localhost:8080/regain/search.jsp?query=filename%3A%22queryfieldvalue%22&order=relevance_desc
What's the best way to do this? Javascript? Do you have a short example for me because I'm really new to javascript.
Thanks a lot in advance.

one way with pure javascript (without jquery) would be
<script type="text/javascript">
function handler()
{
var check = document.getElementById('check');
var query = document.getElementsByName('query')[0];
if(check.checked)
{
query.value = "filename:\"" + query.value + "\"";
}
else
{
query.value = query.value.replace(/^filename:"/, "").replace(/"$/, "");
}
}
</script>
<form>
<input type="text" name="query" />
<input type="checkbox" id="check" onclick="handler()" />box
</form>
it should more or less work, it would be safer if you give query input field an id and then reference it by id, not name

if you use jQuery, something like this should do:
<input type="checkbox" id="chkQuery">Pass queryfield</input>
<script>
$(document).ready(function{}
$("#chkQuery").click(function(){
if ($(this).is(':checked'))
$("input[name='query']").val("filename:queryfieldvalue");
else
$("input[name='query']").val("queryfieldvalue");
});
});
</script>