Checking To See If Element Created With CreateElement Exists
Sep 16, 2009
I'm trying to check to see if a dynamically created element exists BEFORE creating another element of the same exact type...but my if statement at the beginning is not working and another element is just created.
function writeElement(id) {
if(document.getElementsByTagName('transElement')[0]) {
var id = id;
killElement();
writeElement(id);
}
var id = id;
var transElement = document.createElement('transElement');
[Code]...
Code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html lang="EN" dir="ltr" xmlns="http://www.w3.org/1999/xhtml"> <head>
[Code]...
In a few words it creates a button which when it is clicked it launches the add_text script. Add text script creates a text element for a form and puts a random value for the textbox. Textbox also takes a name which is of array type name="txt[]". Also form has the post method.
When I press e.g. 4 times the add text field button 4 text boxes are added. But when I click the submit button I get a result of 1 instead of 4 when the print count($txt) is executed. Copy paste the code to see the problem.
In client side, we can check if some image exists using onerror. I wish the same behavior to check files used in object tag (in client cache, not in file system), like swf, wmv and wma, etc.
MSIE 6.0 apparently does not support protyping with objects created with document.createElement, while Firefox does.
I tested it by typing it into the adress bar, but it also appears to be the case for code embedded in a HTML document. Here's a simple segment of code to demonstrate the difference:
javascript: function myObj(){};myObj.prototype = document.createElement('a'); var x = document.createElement('a'); var y=new myObj(); var z= new Object(); alert(x.href) /*blank in both FF & MSIE6 */; alert(y.href) /* blank in FF but 'undefined' in MSIE6 */; alert(z.href) /* 'undefined' in both FF & MSIE6 */;
I wonder why that is (apart from the fact that MSIE implements JScript and not javascript), and can anyone tell me which of both browsers is complient with W3C standards?
I create a div dynamically and set an ID attribute, e.g. myDiv.setAttribute('id',id_name); I am using these dynamic div to create layers (like popups) within my html. Each div has it's own iframe that loads a webpage within it.Sometimes I need to pass on variable from one div to another.In order to check if a div exists i do the following:
PHP Code: if (document.getElementById('my_div')) {
In IE6 and below, when using createElement and appendChild to add a new select element to the page, it automatically selects the first option.
the page relies on using the onchange event of the select element, and if there is only one option and it is selected, there is no possible way to fire the onchange event.
To get around this, i've had to use innerHTML to build the select element, which I feel is dirty so I want to clean it up.
Any idea's? I have already tried setting each option's selected value to false, etc but nothing other than using innerHTML seems to of worked,.
I am attempting to create an element (to be added later to the document DOM) using createElement.My test case is just:document.createElement("<p>Hello World</p>");My error console shows the following error:
I want to remove 'div' before returning the function. Testing in IE something like div.parentNode.removeChild(div); will fail. If I look in the dom 'div's parentNode is null, so that explains that. It needs to be appended to something first I guess.
I'm using this script to make some changes to a table which is only accessible via a class serverside:
Code:
The first part of the code is a script from Robert Nyman, [url] - my function is added at the end of the script. It works fine, but my page is dynamically generated and sometimes this element with the class name doesn't exist. This gives an error when the page is loaded: "getElementsByClassName("login-headline", "table")[0] is undefined". How can my function be rewritten so that it checks to see if the class is avaliable before running the script?
I wonder if there any better method to check if the element in array B exists in array A, then remove it from array A. Code: var arrA = ['a','b','c','d','e'] var arrB = ['c']; I copied and modified this code from somewhere I got it online, but not sure if I understand it as it has two for-loops in it...
Code: for(var i=0;i<arrA.length;i++) { for(var j=0;j<arrB.length;j++) { if(arrB[j] == arrA[i]) { var index = arrA.indexOf(arrA[i]); }}} code to remove element from array A,
hi everybody, didn't find this using the search :( this is my problem: i create a dom element dynamically (<span>) and want to assign a class attribute to it such that it has some css style, this works in ie, but not in firefox :( here's the simple code:
<div id="somediv"></div>
var div = window.document.getElementById("somediv"); var span = window.document.createElement("span"); span.innerHTML = "span"; span.attributes.getNamedItem("class").nodeValue = "span_class"; div.appendChild(span);
so this works well in ie6, but firefox gives this error: Error: span.attributes.getNamedItem("class") has no properties
if i run this code on a statically defined span (in the html file), where a class attribute already is set:
changing the class to "span_class" works both in ie and firefox.
how can i fix my above code such that it works in both browsers? it seems that on newly created dom elements the class attribute isn't even there (to change it), how can i create it, and then change it?
Has anybody seen a function which checked if one of passed elements is nested in the node of another element passed to function, no matter how deep it is nested ?
I'm trying to run some code when a H2 element is clicked on an unordered list below it. The problem is, the code runs whether the h2 has a ul below it or not.
h[x].onclick = function(){ var ul = this.nextSibling;
Clicking "Subtitle" runs the function on "Subtitle 2". I don't want the function to run unless the next element is an ul. How can I verify that the next element is an unordered list and if not, don't run anything?
I am working on a registration page.I did all the validation but facing problem during username validation.when a user enter email id in the textbox,it first check whether it is present in database or not.. if not present "register successfully" otherwise "email exists"
Is it possible to check for the existence of an element? I have a dynamic page which may or may not have a <div> holding a bunch of thumbnails, and I want a function to check for the existence of the <div>. Doing:
blah = getElementById("thumbnails");
Generates an error.... I was hoping it would just return false or something... Is there a way of doing this?
I would like to be able to test if an element already has a style applied to it. This style might either be an inline style, or come from a stylesheet. I'm writing a plugin which needs to apply a CSS style to an element if it's not already there.
[code]so now if url is xyz.html, the i'm getting the content of that page through AJAX and loading it to a DIV element(x).....and then accessing the div elements "name","category" etc.,but if urls point to heavy pages, it's slow process to do this work. so I WANT TO CHECK WHETHER THOSE DIV ID's EXIST IN THAT PAGE OR NOT WITHOUT LOADING THEM and then GET THEIR VALUES IF EXISTS.
Using advice from this newsgroup, I tried this JS to create new DOM elements on-the-fly
var divSidebarItem = document.createElement("div"); divSideBarItem.setAttribute("class", "sidebarToDo");
but I get a JS error on the second line "divSideBarItem" is not defined when I try and invoke the "setAttribute" method. Is there a better way to create an element with attributes or is there something wrong with the above?
