Develop Reference

Setting and getting localStorage with jQuery

I am trying out localStorage and attempting at getting text from a div and storing it in localStorage, however, it sets it as an [object Object] and returns [object Object]. Why is this happening?
localStorage.content = $('#test').html('Test');
$('#test').html(localStorage.content);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="test"></div>

You said you are attempting to get the text from a div and store it on local storage.
Please Note: Text and Html are different. In the question you mentioned text. html() will return Html content like <a>example</a>. if you want to get Text content then you have to use text() instead of html() then the result will be example instead of <a>example<a>. Anyway, I am using your terminology let it be Text.
Step 1: get the text from div.
what you did is not get the text from div but set the text to a div.
$('#test').html("Test");
is actually setting text to div and the output will be a jQuery object. That is why it sets it as [object Object].
To get the text you have to write like this
$('#test').html();
This will return a string not an object so the result will be Test in your case.
Step 2: set it to local storage.
Your approach is correct and you can write it as
localStorage.key=value
But the preferred approach is
localStorage.setItem(key,value); to set
localStorage.getItem(key); to get.
key and value must be strings.
so in your context code will become
$('#test').html("Test");
localStorage.content = $('#test').html();
$('#test').html(localStorage.content);
But I don't find any meaning in your code. Because you want to get the text from div and store it on local storage. And again you are reading the same from local storage and set to div. just like a=10; b=a; a=b;
If you are facing any other problems please update your question accordingly.

Use setItem and getItem if you want to write simple strings to localStorage. Also you should be using text() if it's the text you're after as you say, else you will get the full HTML as a string.
Sample using .text()
// get the text
var text = $('#test').text();
// set the item in localStorage
localStorage.setItem('test', text);
// alert the value to check if we got it
alert(localStorage.getItem('test'));
JSFiddle:
https://jsfiddle.net/f3zLa3zc/
Storing the HTML itself
// get html
var html = $('#test')[0].outerHTML;
// set localstorage
localStorage.setItem('htmltest', html);
// test if it works
alert(localStorage.getItem('htmltest'));
JSFiddle:
https://jsfiddle.net/psfL82q3/1/
Update on user comment
A user want to update the localStorage when the div's content changes. Since it's unclear how the div contents changes (ajax, other method?) contenteditable and blur() is used to change the contents of the div and overwrite the old localStorage entry.
// get the text
var text = $('#test').text();
// set the item in localStorage
localStorage.setItem('test', text);
// bind text to 'blur' event for div
$('#test').on('blur', function() {
// check the new text
var newText = $(this).text();
// overwrite the old text
localStorage.setItem('test', newText);
// test if it works
alert(localStorage.getItem('test'));
});
If we were using ajax we would instead trigger the function it via the function responsible for updating the contents.
JSFiddle:
https://jsfiddle.net/g1b8m1fc/

The localStorage can only store string content and you are trying to store a jQuery object since html(htmlString) returns a jQuery object.
You need to set the string content instead of an object. And use the setItem method to add data and getItem to get data.
window.localStorage.setItem('content', 'Test');
$('#test').html(window.localStorage.getItem('content'));

get the html of element itself using jquery .html()

How to get the html of element itself using Jquery html. In the below code I would like get the input element inside div using JQuery as shwon below
<div id="content">content div</div>
<input type='text' id="scheduledDate" class="datetime" />
$(function() {
console.log($('#scheduledDate').html('dsadasdasd'));
$('#content').html($('#scheduledDate').html());
});
EDIT:
Can I get the $("#scheduledDate") as string which represent the real html code of the input box, because my final requirement is I want to pass it to some other SubView( I am using backboneJS) and eventually use that html code in a dust file.
My original requirement was to get that input field as string so that I can pass it to some other function. I know, if I keep it inside a DIV or some other container, I can get the html by using .html method of JQuery. I dont want use some other for that purpose. I am just trying to get html content of the input box itself using it's id.

If you want to move the input element into div, try this:
$('#content').append($('#scheduledDate'));
If you want to copy the input element into div, try this:
$('#content').append($('#scheduledDate').clone());
Note: after move or copy element, the event listener may need be registered again.

$(function() {
var content = $('#content');
var scheduledDate = $('#scheduledDate');
content.empty();
content.append(scheduledDate.clone());
});
As the original author has stated that they explicitly want the html of the input:
$(function() {
var scheduledDate = $('#scheduledDate').clone();
var temporaryElement = $('<div></div>');
var scheduleDateAsString = temporaryElement.append(scheduledDate).html();
// do what you want with the html such as log it
console.log(scheduleDateAsString);
// or store it back into #content
$('#content').empty().append(scheduleDateAsString);
});
Is how I would implement this. See below for a working example:
https://jsfiddle.net/wzy168xy/2/

A plain or pure JavaScript method, can do better...
scheduledDate.outerHTML //HTML5
or calling by
document.getElementById("scheduledDate").outerHTML //HTML4.01 -FF.
should do/return the same, e.g.:
>> '<input id="scheduledDate" type="text" value="" calss="datetime">'
if this, is what you are asking for
fiddle
p.s.: what do you mean by "calss" ? :-)

This can be done the following ways:
1.Input box moved to the div and the div content remains along with the added input
$(document).ready(function() {
var $inputBox = $("#scheduledDate");
$("#content").append($inputBox);
});
2.The div is replaced with the copy of the input box(as nnn pointed out)
$(document).ready(function() {
var $inputBox = $("#scheduledDate");
var $clonedInputBox = $("#scheduledDate").clone();
$("#content").html($clonedInputBox);
});
Div is replaced by the original input box
$(document).ready(function() {
var $inputBox = $("#scheduledDate");
$("#content").html($inputBox);
});
https://jsfiddle.net/atg5m6ym/4485/
EDIT 1:
to get the input html as string inside the div itself use this
$("#scheduledDate").prop('outerHTML')
This will give the input objects html as string
Check this js fiddle and tell if this is what you need
https://jsfiddle.net/atg5m6ym/4496/

Create a region on HTML with changing values

I am a beginner in HTML and I want to create a region on a HTML page where the values keep on changing. (For example, if the region showed "56" (integer) before, after pressing of some specific button on the page by the user, the value may change, say "60" (integer) ).
Please note that this integer is to be supplied by external JavaScript.
Efforts I have put:
I have discovered one way of doing this by using the <canvas> tag, defining a region, and then writing on the region. I learnt how to write text on canvas from http://diveintohtml5.info/canvas.html#text
To write again, clear the canvas, by using canvas.width=canvas.width and then write the text again.
My question is, Is there any other (easier) method of doing this apart from the one being mentioned here?
Thank You.

You can normally do it with a div. Here I use the button click function. You can do it with your action. I have use jquery for doing this.
$('.click').click(function() {
var tempText = your_random_value;
// replace the contents of the div with the above text
$('#content-container').html(tempText);
});

You can edit the DOM (Document Object Model) directly with JavaScript (without jQuery).
JavaScript:
var number = 1;
function IncrementNumber() {
document.getElementById('num').innerText = number;
number++;
}
HTML:
<span id="num">0</span>
<input type='button' onclick='IncrementNumber()' value='+'/>
Here is a jsfiddle with an example http://jsfiddle.net/G638z/

Can jQuery or Javascript change elements within textareas?

My first SO question! Here's what I am trying to do:
I'm rewriting a tool that generates some code a user can paste directly into Craigslist and other classified ad posting websites. I have created a list of websites (they populate from a database with PHP) the user can choose from with a radio button, and I want their choice to populate as bare text (not a link) between some <p></p> elements in a textarea. I'm using jQuery for this.
Textarea before the user chooses:
<p id="thing"></p>
Textarea after the user chooses:
<p id="thing">www.somewebsite.com</p>
HTML
<input type="radio" name="sitechoice" value="www.websiteone.com">www.websiteone.com<br />
<input type="radio" name="sitechoice" value="www.secondwebs.com">www.secondwebs.com
<textarea>
Some stuff already in here
Here is the website you chose:
<p id="thing"></p>
More stuff already here.
</textarea>
JS
$(document).ready(function () {
$("input").change(function () {
var website = $(this).val();
alert(website);
$("#thing2").html(website);
});
});
JS Fiddle (With comments)
If you see the JS Fiddle, you can see that I put another p element on the page outside the textarea, and it updates just fine, but the one inside the textarea does not. I have read many other like questions on SO and I'm starting to think that I can't change an element that's between textarea tags, I can only change the entire textarea itself. Please, lead me to enlightenment!

You actually can fairly easily manipulate the text contents of the textarea like it is part of the DOM, by transforming its contents into a jQuery object.
Here is a jsFiddle demonstrating this solution: http://jsfiddle.net/YxtH4/2/
The relevant code, inside the input change event:
// Your normal code
var website = $(this).val();
$("#thing2").html(website);
// This turns the textarea's val into a jQuery object ...
// And inserts it into an empty div that is created
var textareaHtml = $('<div>' + $("#textarea").val() + '</div>');
// Here you can do your normal selectors
textareaHtml.find("#thing").html(website);
// And this sets the textarea's content to the empty div's content
$("#textarea").val(textareaHtml.html());
The empty div wrapping your HTML is so that you can easily retrieve it as a string later using jQuery's .html() method, and so the parse does not fail if additional text is entered around the p element inside the textarea.
The real magic is $($("#textarea").val()), which takes your textarea's text and parses it into an HTML node contained in a jQuery object.

It can't do it the way that you are thinking (i.e., manipulate it as if it were a DOM element), but it is still accessible as the value of the textarea, so you can retrieve it like that, use basic string manipulation to alter it, and then set the updated string as the new value of the textarea again.
Something like this . . . first give the <textarea> an id value:
<textarea id="taTarget">
Some stuff already in here
Here is the website you chose:
<p id="thing"></p>
More stuff already here.
</textarea>
Then alter your script like this:
$(document).ready(function () {
$("input").change(function () {
var website = $(this).val();
var currentTAVal = $("#taTarget").val();
$("#taTarget").val(currentTAVal.replace(/(<p id="thing">)([^<]*)(<\/p>)/, "$1" + website + "$3"));
});
});
Unless you need the <p> element in there, you might consider using a more simple placeholder, since it won't actually act as an HTML element within the textarea. :)
EDIT : Fixed a typo in the .replace() regex.

I know that this answer is a little bit late, but here it goes =)
You can do exactly the way you want to do. But for that, you need to implement a small trick.
by having this HTML
<input type="radio" name="sitechoice" value="www.websiteone.com">www.websiteone.com
<br />
<input type="radio" name="sitechoice" value="www.secondwebs.com">www.secondwebs.com
<p id="thing2"></p>
<textarea id="textarea">
<p id="thing"></p>
</textarea>
you can edit textarea content, as a DOM by implementing something like the function changeInnerText
$(document).ready(function () {
$("input").change(function () {
var website = $(this).val(); // Gets value of input
changeInnerText(website);
//$("#thing").html(website); // Changes
//$("#thing2").html(website); // Does not change
});
var changeInnerText = function(text) {
var v = $("#textarea").val();
var span = $("<span>");
span.html(v);
var obj = span.find("#thing")[0];
$(obj).html(text);
console.log(obj);
console.log(span.html());
$("#textarea").val(span.html());
}
});
As you can see, I just get the information from the textarea, I create a temporary variable span to place textarea's content. and then manipulate it as DOM.

Instead of attempting to insert the text into the <p> element, insert the text into <textarea> element and include the <p> tag. Something like this should do the trick:
Change:
$("#thing").html(website);
to:
$("textarea").html('<p id="thing">'+website+'</p>');
And here is a fiddle: http://jsfiddle.net/nR94s/

Can I use a variable in JS for my html?

I have a JS file CharacterSelection where a user can select an avatar and type their name into a textarea.
Now I want to set a text div in an html file to the contents of the textarea. I will use it to display the player's name at a specific location on the screen.
I know that I can set a div to a text, such as: <div id ="statSheetExitButton">Exit</div> will show "Exit" (style and location depending on css)
I'm wondering if there is any way to put a String variable in there, since I will not know what name the player enters.
I grab the textarea's contents using var name = $("#nameTextBox").val();
I'm thinking that saying <div id ="playerName">name</div> will display the text "name".
Is there a way to accomplish my goal?

$("#nameTextBox").change(function(){
$("#playerName").html($(this).val());
});
This will attach an event handler to the textbox so everytime the name changes the div is updated.
Here is a working example. http://jsfiddle.net/2NkTb/
Please note that for the onchange event you must tab out of textbox or the textbox must lose focus

var name = $("#nameTextBox").val();
$("#playerName").html(name);

Do this:
var name = $("#nameTextBox").val();
$('#playerName').text(name);

You could do something like this which will replace the html of the tag with your JavaScript string:
$('#playerName').html(myNameVar);
Other than that, I don't think you can directly inject JavaScript variables like you would in a template language.

Try:
$('#playerName').html($("#textbo").val());

var playerName = 'John Dow'
document.getElementById('playerName').innerHTML=playerName

You need to set the property innerHTML of you div element.
$("playerName").innerHTML = name;