Develop Reference

Javascript: change element value by input textbox

I want to change THISVALUE using a textbox and submit button, which then refreshes the data on the page:
<form id="newssearch" action="#">
<input type="text" size="30" maxlength="155" name="search" id="search" />
<input type="button" name="submit" value="Search" onclick="showElements();" />
</form>
<div class="sm" data-type="static" data-symbol="THISVALUE" data-size="medium" data-logscale="on" data-chart-type="ca" data-timeframe="1y"></div>
<div class="sm" data-type="news" data-symbol="THISVALUE"></div>
Also: you press the button and it refreshes the page with the new data-symbol value. That value stays for the next visit to the page or until another search is performed.
Perhaps it would be better to do this in php?

You can also use the setAttribute() function
function showElements(){
document.getElementsByClassName('blah')[0].setAttribute("data-symbol",document.getElementById('search').value);
}

First off - data-symbol is not an element. It is an attribute and to be more specific - a data attribute.
Learn more about data attributes here: Using data attributes | MDN
I assume you want the data submitted in the form to get into the data-symbol attribute.
Checkout the working code snippet below:
function showElements(){
// just copy over the search text into the data attribute
document.getElementsByClassName('blah')[0].dataset.symbol = document.getElementById('search').value;
}
<div class="blah" data-type="cur" data-symbol="THISVALUE"></div>
<form id="newssearch" action="#">
<input type="text" size="30" maxlength="155" name="search" id="search" />
<input type="button" name="submit" value="Search" onclick="showElements();" /> <!-- no need to pass any arguments to this function, we can get data using element ID -->
</form>
Check the result using Developer Tools (I have used Chrome here):

How to add a hidden list of IDs to a form in Javascript?

I've got a simple form in html:
<form action="" method="post">
<input id="title" name="title" size="30" type="text" value="">
<input type="submit" value="Save this stuff">
</form>
I also have a file upload on the page, which handles uploads using ajax and adds the files to a mongoDB. The file upload returns the mongoDB id of the file (for example 12345) and I want to add that id to the form as a hidden field so that the id is POSTed to the server upon submitting the form. Since the user can add multiple files though, I want to add a list of id's to the form.
I found how I can add one hidden field to a form from javascript, but this always handles a single field, not a field with multiple values. So I thought of adding a checkbox field to the form so that I can submit multiple values in one element, but it kinda feels like a hack.
Can anybody hint me in the right direction on how I can add a hidden list of values to a form using Javascript? All tips are welcome!
[EDIT]
In the end I would like the form to look something like this:
<form action="" method="post">
<input type="hidden" name="ids" value="[123, 534, 634, 938, 283, 293]">
<input id="title" name="title" size="30" type="text" value="">
<input type="submit" value="Save this stuff">
</form>

I am not sure if I understand your question correctly, so I may just be guessing here.
Try adding multiple hidden inputs with a name such as ids[] so that they will be posted to the server as an array.
Example:
<form action="" method="post">
<input type="hidden" name="ids[]" value="123">
<input type="hidden" name="ids[]" value="534">
<input type="hidden" name="ids[]" value="634">
<input type="hidden" name="ids[]" value="938">
<input type="hidden" name="ids[]" value="283">
<input type="hidden" name="ids[]" value="293">
<input type="submit" value="Save this stuff">
</form>

Why not simply concatenating all the ids into a string like so "123,456,890,..etc" and then adding them as a value to ids inupt. When you need them, simply split by ',' which would give you an array with ids?
Todo so only with javascript something like this should work
var elem = document.getElementById("ids");
elem.value = elem.value + "," + newId;

Do you mean that for each time the user clicks the 'upload' button you need to add a hidden field to the form?
Can you post the entire form, that should clear things up...
[Edit]
you could store the id's in an Array, everytime an id should be added to the hidden field's value you could do somthing like:
$('#ids').attr('value', idArray.join());
I'm just typing this out of the box so excuse any little errors

Dynamic links with JavaScript

this is my problem.I have a JSP. I want to create a hyperlink dynamically with Javascript. I want to add the text from an input in HTML and use it to pass it as a parameter in my URL:
<form name="test">
<P>Enter search: <input type="text" name="searchName"><BR><BR>
<input type="Button" Value="" onclick="location.href='search.jsp?typeOfSearch=" + JavaScriptFunction( that returns the String from searchName ) ' " >
</P>
</FORM>
I cant seem to add a JS function to the "onclick" string. I ve tried with HREF from an anchor but I cant make it work. And I ve also tried just putting a JS function like this:
<a href="MyJSfunction( that returns the entire URL ) " > hyperlink</a>
and also it does not work. I ve tried like a million diferent things and I still cant pass dynamic parameters from one JSP to another.
Any help would be very good! ...

No JavaScript required. Just set your form method and action, use a submit button, and rename your input field:
<form name="test" method="GET" action="search.jsp">
<p>
Enter search: <input type="text" name="typeOfSearch" /><br/><br/>
<input type="Submit" Value="Go" />
</p>
</form>
Edit: But, if you are just curious how to do it with JavaScript, form elements all have a form property. Form elements are accessible from the form by name. So, you can use this.form.searchName.value to get the value of the searchName field in the same form as your button:
<input type="Button" Value=""
onclick="location.href='search.jsp?typeOfSearch=' + this.form.searchName.value;" />
Edit: The trouble you are having with your current code may be because you have the quotes wrong. Change the double quote at the end of typeOfSearch=" to a single quote: typeOfSearch='. Remove the single quote following your function call:
<input type="Button" value=""
onclick="location.href='search.jsp?typeOfSearch=' + JavaScriptFunction()" />

If you aren't too concerned about security, a simple HTML form should work.
<form action="Your URL Here">
<input type="text" value="" name="search" />
<input type="submit" value="search" />
</form>
http://jsfiddle.net/harveyramer/VfuT4/

Javascript/ Facebox getElementById not returning anything

I am opening up a small modal dialog using facebox with a form and then trying to access the value inside a text field on that form with javascript. This is the HTML code -
<div id="dialog-form95" style="display:none">
<div class="block">
<form action="" method="post" name="form95">
<h3>Setting URL</h3>
<p></p>
<p><label>URL : </label></p><input type="text" class="text" id="du95" name="url"/>
<p><input type="submit" class="submit small" value="save" onclick="updateUrl(95,109); return false;"/></p>
</form>
</div>
</div>
This is the javascript onclick -
function updateUrl(bid, cid){
alert(document.getElementById('du'+bid).value);
}
I even tried hardcoding "du95". Whenever i update anything in the textbox and submit, it shows a blank alert dialog. Nothing shows up in the js console as well.

That's because it has no value. Try and see what happens:
<input type="text" class="text" id="du95" name="url" value="testing" />

For some reason you have display: none in you container div.
After removing that it seems to work fine in jsfiddle: http://jsfiddle.net/8bSdK/

jQuery modal window removes elements from my form

jQuery, when i use it to create a modal window which contains form elemets,
it takes out those elements when i submit the form.
example of the form:
<form enctype="multipart/form-data" action="/system/article/add/" class="from" method="post">
<label for="article_title" class="required">Title:</label>
<input class="formfield" id="article_title" name="article_title" value="" type="text">
<label for="url" class="required">Url:</label>
<input class="formfield" id="url" name="url" value="" type="text">
<div id="add_photo" style="width: auto;" class="ui-dialog-content ui-widget-content" title="Add Photo">
<label for="photo_title" class="optional">Photo title:</label>
<input class="formfield" id="photo_title" name="photo_title" value="" type="text">
<label for="photot" class="optional">Photo thumb:</label>
<input type="file" name="photot" id="photot" class="formfield">
<label for="photo_checkbox" class="optional">Include lighbox?</label>
<input name="photo_checkbox" value="0" type="hidden">
<input class="checkbox" id="photo_checkbox" name="photo_checkbox" value="1" type="checkbox">
<label for="photo_big" class="optional">Photo:</label>
<input type="file" name="photo_big" id="photo_big" class="formfield">
</div>
</form>
exaple of JS:
<script>
$(document).ready(function(){
$("#add_photo").dialog({
autoOpen: false,
buttons: {
"Ok": function() {
$(this).dialog("close");
}
}
});
});
So what i nocited during the inspetion via firebug, is that jquery actually removes my form elements within #add_photo and puts them outside the form in DOM, so even tough in html the modal dialog is within my form, in DOM it isn't ....
An this is the reason why i'm having the issue!
Have anyone encountered simmilar problem?
Any solution?! Thank you very much!

I just had the same problem. I solved it by adding another
<div id="beforesubmit" style="display:none"></div>
at the end (but inside) of the form and then you have to add this to jQuery:
$("form").submit(function() {
$("#add_photo").prependTo("#beforesubmit");
});
This will make sure that before the form is submit your dialog div will be put back in between the form tags. Thanks to arnorhs I came to this solution.
Cheers!

I'm not sure what dialog box plugin you're using, but I would suspect that the dialog box plugin is pulling the DIV out of the form and placing it into the body of the page, so It can bring the box in front of the page, outside of the form element.
So to rephrase, in order for the dialog box plugin to make your dialog appear in front of all the content on your page, it needs to remove it from whatever element it is sitting in, no matter if it's a form or anything else.

The form needs to be inside the div. That's how it is in all the Dialog examples. Not sure how you're going to do that with the title and url inputs not being on the dialog. Couldn't you put them on it too?
This wouldn't have the problem:
<div id="add_photo" style="width: auto;" class="ui-dialog-content ui-widget-content" title="Add Photo">
<form enctype="multipart/form-data" action="/system/article/add/" class="from" method="post">
<label for="article_title" class="required">Title:</label>
<input class="formfield" id="article_title" name="article_title" value="" type="text">
<label for="url" class="required">Url:</label>
<input class="formfield" id="url" name="url" value="" type="text">
<label for="photo_title" class="optional">Photo title:</label>
<input class="formfield" id="photo_title" name="photo_title" value="" type="text">
<label for="photot" class="optional">Photo thumb:</label>
<input type="file" name="photot" id="photot" class="formfield">
<label for="photo_checkbox" class="optional">Include lighbox?</label>
<input name="photo_checkbox" value="0" type="hidden">
<input class="checkbox" id="photo_checkbox" name="photo_checkbox" value="1" type="checkbox">
<label for="photo_big" class="optional">Photo:</label>
<input type="file" name="photo_big" id="photo_big" class="formfield">
</form>
</div>

This article describes how to solve your problem:
You’ll see that the content we had mid-way through our page has been marked up with additional classes and, most importantly, placed at the bottom of the page immediately before the closing tag. Why is this important? Because it also means that any ASP.Net controls you place within this dialog will also appear at the bottom of the page, outside of the page’s tag. This means you won’t be able to get a handle to them on postback.
What’s the solution? Well, there are two options:
Move the elements back to the form, and manually submit when the button is clicked
Clone the elements when you create the dialog, then clone the values back, trigger click on the original button (or, if you only have one or two values to post back, simply assign the values to an ASP.Net hidden field control).

From http://blog.coreycoogan.com/2010/12/01/jquerys-dialog-and-form-problems/
Tie it to the form by doing $("mydialog").parent().appendTo($("form:first")).
Note that you have to this call after you already called $("mydialog").dialog()

As seen in the answer for this question, jQuery dialog has a field appendTo, that can be used to configure where to put your dialog (div-wise) on initialization.
This seems to be the least ninja-workaround version to tackle the problem.