Develop Reference

Javascript create element and add HTML

say for instance i have the following line:
var arrowBase = document.createElement('div')
Now within this div tag i want to add some HTML (i.e text).
Then i tried the following:
arrowBase.innerHTML('hello');
However this does nothing:S
i have also tried: arrowBase.HTML('hello');
But once again without any result
I know is that rather simple but in my search i could'nt find the answer hope someone is able to help me out here

Read the docs, it is not a method.
arrowBase.innerHTML = 'hello';

arrowBase.textContent = "HELLO"
also does the same thing but only text can be specified. Whereas in innerHTML html tags can be specified along with the text.

Submit form and return result to same page with javascript

Im trying to write a small js script that will let a user input a string of text and then output it wrapped in some html to the page.
I know how to do this with php, but it seems a little bit of an overkill for such a simple action, plus im always keen to learn something new.
I was playing around using document.myform.submit(); but i wasnt sure how to submit the form value to a variable and then output that var to the screen using document.write();
Any ideas how i would do this ?
Ive created a jsfiddle of the problem here - http://jsfiddle.net/pudle/axcLz/

There are many ways to do it. Here is the code that shows one of them:
document.getElementById("myform").onsubmit = function (event) {
var link = document.getElementById("mylink");
var textField = document.getElementById("text");
link.href = textField.value;
textNode = document.createTextNode(textField.value);
if (link.hasChildNodes()) {
link.removeChild(link.lastChild);
}
link.appendChild(textNode);
event.preventDefault();
};
jsfiddle: http://jsfiddle.net/TMJGH/5/
I added an id attribute to the a element to make things easier.
First line says that we want to change the function that handles "onsubmit" event in our form and then we define that function. The "event" argument is used only to call .preventDefault() in the last line which basically means that we don't want the form to be actually submitted.
We need to get access to DOM elements in the javascript code, so I used document.getElementById. Then I set the href attribute to the value of the textField. To change the actual link text I created a new text node with the value of the textField (it is possible to use textNode.innerHTML but that won't escape HTML code if someone inserts it in the text field). Then I check if our a element already has some text in it - if yes, it has to be removed. Finally I append the text element as a new child to our a element.
If you want to append more HTML nodes inside a node you can easily create them with document.createElement('element name') and append them to link. I also have to mention that jQuery makes playing with DOM a lot easier.

Removing data attributes from HTML using jQuery

Can't seem to get this one to work...
I have a page that hides certain links. When the DOM is loaded, I'm using jQuery to toggle some of those elements. This is driven by using a data attribute like so:
<div class="d_btn" data-usr='48'>
<div class="hidden_button">
Then, I have the code:
$.each($(".d_btn"), function() {
var btn = $(this).data('usr');
if ( btn == '48' ){
$(this).children('.hidden_button').toggle();
}
The above all works as planned. The problem is that I am trying to remove the data-usr from the class .d_btn once the if statement is evaluated. I've tried the following and nothing works (i.e., after the page is loaded, the source still shows the data-usr attribute:
$(this).removeAttr("data-usr");
$(this).removeData("usr");
I've been working on this for a couple of hours now and...nothing! Help is greatly appreciated!
UPDATE
I've tried the great suggestions of setting the data attribute to an empty string but I'm still not getting the desired result.
To explain a little further, The reason I'm trying to remove the attribute is so when an ajax response adds another item to the page, the previously added items would already have the button either shown or hidden. Upon AJAX response, I'm calling the same function once the DOM is loaded.
Currently, when something is added via AJAX, it toggles all the buttons (showing the ones that were hidden and vice versa.) Ugh...
I'm also fully willing to try alternatives to my approach. Thanks!
UPDATE
Well, the light bulb just flashed and I am able to do what I want to do by just using .show() instead of .toggle()
Anyway, I'd still like to find an answer to this question because the page will be potentially checking hundreds of items whenever something is added - this seems horribly inefficient (even for a computer, hahaha.)

Why don't you set the value to a random value or empty variable instead if removeAttr does not work..
$(this).attr("data-usr" , '');
$(this).prop("data-usr" , '');

Changing the DOM doesn't affect the source. It affects the DOM, which you can view with the Inspector/Developer Tools. Right click => View Source will give you the original source of the page, not the actual current source as modified by JavaScript.

Set it to a blank string:
$(this).attr("data-usr", "");
I second what Kolink said: check the DOM, not the source. (Chrome: Ctrl + Shift + i).

As others have stated. Checking the source will only show the original unedited source for the webpage. What you need to do is check the DOM using developer tools.
I've just checked everything in Chrome's inspector on jsfiddle here and the attribute is definitely being removed as well as the data.

Perform Click on an Element

I am working on Selenium WebDriver.
I need to point the mouse to an element and perform click on it and I want to use javascript here instead of Xpaths.
The javascript of that element is not a method so that I can just fire it directly.
I am confused how to create a javascript so that the method when auto-executed should go to that object (I want to point to that object using its javascript only) and perform click.
Element's javascript:
javascript:setParam(paramOrderNbr, '4');
go('survey_editing.jsp','actMoveItemUp);
Please help!
Kumar

try this:
String cssSelector =.... //css selector of the element you want click on
JavascriptExecutor js = (JavascriptExecutor) driver;
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("var x = $(\'"+cssSelector+"\');");
stringBuilder.append("x.click();");
js.executeScript(stringBuilder.toString());
hope this works for you

Good job.
But try to modify a lil bit your css selector.
Try simply map[name="edit_1"]> area
But before you try to execute anuthing verify with firebug ( i use firepath, firebug addon in ffox) to verify that your css selector is correct.
Then try execute the code I mentioned above. It always works.
But also is possible to try another approach. If your selenium test is connected with pointing out web element with onmousehover action handling.
Then is possible to user action builder:
WebElement mnuElement;
WebElement submnuElement;
mnEle = driver.findElement(By.Id("mnEle")).click();
sbEle = driver.findElement(By.Id("sbEle")).click();
Actions builder = new Actions(driver);
// Move cursor to the Main Menu Element
builder.moveToElement(mnEle).perform();
// Giving 5 Secs for submenu to be displayed
Thread.sleep(5000L);
// Clicking on the Hidden SubMenu
driver.findElement(By.Id("sbEle")).click();
please inform as soon as you check this one.

I've made a little investigation on your problem. And now I'ma a lil bit frustrated.
Firebug is unable to locate anything which is contained in <script> tags.
See the picture below
So if we are unable of locating element using standard tree DOM model then the last assumption is left (in my opinion). I'll share only the idea I would implement if come across with your problem. Simply try to click on fixed coordinates using js.But this is considered to be bad approach. It is explained here
So returning back to the js locating coordinates to click you can use this
Using described part we locate x, y coordinates of the element we need to locate. And using this
you can actually perform the click.
Something like that:
JavascriptExecutor js = (JavascriptExecutor) driver;
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("x.trigger("click", [x, y]);"); //where [x,y] you've already //obtained
js.executeScript(stringBuilder.toString());
By the way, you can get to know about advanced user actions here . I find it quite helpful in some cases.
But it still seems to me that somehow it is possbile to locate your needed element in DOM.
Hope my answer helps somehow)

JavaScript - How to get the current selection 'index' within a document

My code here returns a JavaScript selection object from within an iFrame (the iFrame page is within the same domain, so no xss issue).
What I need to know is the index of the selection within the raw html code (not the dom).
UPDATE:
E.g.
If you have an html doc:
<html><body>ABC</body></html>
And in the UI, the user uses their mouse to select the text 'ABC', I want to be able to use JavaScript to determine the postion of the selected text in the html source. In this case the index of ABC is 13.
UPDATE 2
The reason I'm persisting with this madness, is that I need to create a tool that can revisit a page and pull text based on a selected text the user has identified at an earlier time. The user tells the system where the text is, and the system from that point on uses regular expressions to pull the text. Now, if the dom is not the same as the raw html, and there's no way to pinpoint the selection in the raw html - it's really difficult to know what reg ex to generate. I don't think there's another way around this.
// Returns the raw selection object currently
// selected in the UI
function getCurrentSelection() {
var selection = null;
var iFrame = document.getElementById('uc_iFrameGetPriceData');
try {
if (window.getSelection) { // Gecko
selection = iFrame.contentWindow.getSelection();
}
else { // IE
var iframeDoc = iFrame.contentWindow.document;
if (iframeDoc.selection) {
selection = iframeDoc.selection;
}
else {
selection = iframeDoc.contentWindow.getSelection();
}
}
}
catch (err) {
alert( 'Error: getCurrentSelection() - ' + err.description )
}
return selection;
}

You can access the index and offset of your selection by using selection.anchorOffset and selection.focusOffset.
Take a look at this:
http://help.dottoro.com/ljjmnrqr.php
And here's another well explaned article:
http://www.quirksmode.org/dom/range_intro.html
update to your update: I'm not sure why you're trying to get the index of the raw HTML code. But you can walk the DOM based on the selection kinda like this:
selection.anchorNode.nodeValue.replace(selection.anchorNode.nodeValue.substring(selection.anchorOffset, selection.focusOffset), 'replace value')
Note that it's still possible that anchorOffset is before focusOffset, based on whether you selected the text from left to right or from right to left.

If I understand correctly, you're looking to move around in the DOM. In that case, you can use these methods/properties:
parentNode
getChildNodes()
firstChild and lastChild
...and these links might help:
http://www.codingforums.com/archive/index.php/t-81035.html
http://www.sitepoint.com/forums/showthread.php?t=586034
The fastest way is probably
var node = document.getElementById('myElement');
alert(node.parentNode.indexOf(node));
(Sorry, for some reason the formatting buttons aren't showing up in my "Your Answer" area...)

I would be surprised if that information was available.
No DOM API is going to let you distinguish between
<html><body>ABC</body></html>
and
<html ><body >ABC</body></html>
The index in the raw HTML is different in each case, but the constructed DOM is identical.

You can't do this sensibly: the only possible method is to re-download the page's HTML via Ajax, parse the HTML and match the resulting DOM against the current DOM, which may itself have been altered by JavaScript. Besides, it's not a useful number anyway because once the page has been loaded, the original HTML string simply no longer exists in the DOM so offsets within that string have no meaning in JavaScript. Getting the selection in terms of nodes and offsets is much more sensible.