getelementbyid

getElementById returning value only for first element

由 家住魔仙堡 提交于 2019-11-26 18:34:21
问题 I have a script which is called on request on some generated elements, and selects specified element by id. The bizarre issue I'm experiencing is that the select perfectly works for the first item on the page but returns null for every other item. What could be the cause of this? Here's the relevant Javascript: <script type="text/javascript"> function showFrame(content, id, vid, crating) { var container = document.getElementById(vid+'_container'); $('#'+vid+'_embed').html(content); $('#'+vid+

Getting the parent div of element

由 寵の児 提交于 2019-11-26 16:04:21
This should be really simple but I'm having trouble with it. How do I get a parent div of a child element? My HTML: <div id="test"> <p id="myParagraph">Testing</p> </div> My JavaScript: var pDoc = document.getElementById("myParagraph"); var parentDiv = ?????????? I would have thought document.parent or parent.container would work but I keep getting not defined errors. Note that the pDoc is defined, just not certain variables of it. Any ideas? P.S. I would prefer to avoid jQuery if possible. You're looking for parentNode , which Element inherits from Node : parentDiv = pDoc.parentNode; Handy

Selecting an element in iFrame jQuery

由 安稳与你 提交于 2019-11-26 15:14:59
In our application, we parse a web page and load it into another page in an iFrame. All the elements in that loaded page have their tokenid-s. I need to select the elements by those tokenid-s. Means - I click on an element on the main page and select corresponding element in the page in the iFrame. With the help of jQuery I'm doing it in the following way: function selectElement(token) { $('[tokenid=' + token + ']').addClass('border'); } However with this function I can select the elements in the current page only, not in the iFrame. Could anybody tell me how can I select the elements in the

getElementById returns null? [closed]

由 非 Y 不嫁゛ 提交于 2019-11-26 13:21:27
document.getElementById('id of div that definately exists') returns null. I originally loaded the javascript last in order to make sure I wouldn't need to worry about the onload event. I also tried using the onload event. It's very spooky. Any ideas or help would be greatly appreciated. It can be caused by: Invalid HTML syntax (some tag is not closed or similar error) Duplicate IDs - there are two HTML DOM elements with the same ID Maybe element you are trying to get by ID is created dynamically (loaded by ajax or created by script)? Please, post your code. Also be careful how you execute the

Javascript Append Child AFTER Element [duplicate]

由 我的未来我决定 提交于 2019-11-26 12:08:18
问题 This question already has an answer here: How to insert an element after another element in JavaScript without using a library? 17 answers I would like to append an li element after another li inside a ul element using javascript, This is the code I have so far.. var parentGuest = document.getElementById(\"one\"); var childGuest = document.createElement(\"li\"); childGuest.id = \"two\"; I am familiar with appendChild, parentGuest.appendChild(childGuest); However this appends the new element

Javascript can&#39;t find element by id? [duplicate]

由 寵の児 提交于 2019-11-26 11:53:27
This question already has an answer here: Why does jQuery or a DOM method such as getElementById not find the element? 8 answers <html> <head> <title>Test javascript</title> <script type="text/javascript"> var e = document.getElementById("db_info"); e.innerHTML='Found you'; </script> </head> <body> <div id="content"> <div id="tables"> </div> <div id="db_info"> </div> </div> </body> </html> If I use alert(e); it turns up null .... and obviously I don't get any "found you" on screen. What am I doing wrong? The problem is that you are trying to access the element before it exists. You need to

getElementById.contentDocument error in IE

由 人走茶凉 提交于 2019-11-26 11:25:24
问题 <html> <script type=\"text/javascript\"> function func() { alert(document.getElementById(\'iView\').contentDocument); } </script> <body> <iframe id=\"iView\" style=\"width:200px;height:200px;\"></iframe> <a href=\"#\" onclick=\"func();\">click</a> </body> </html> After click, Firefox returns [object HTMLDocument]. Internet Explorer returns undefined. How can I select the iView element with Internet Explorer? Thanks. 回答1: From this page: Mozilla supports the W3C standard of accessing iframe's

getElementById() returns null even though the element exists [duplicate]

由 本秂侑毒 提交于 2019-11-26 10:35:03
This question already has an answer here: Why does jQuery or a DOM method such as getElementById not find the element? 8 answers I'm trying to get the element with getElementById(), but it returns null even though the element exists. What am I doing wrong? <html> <head> <title>blah</title> <script type="text/javascript"> alert(document.getElementById("abc")); </script> </head> <body> <div id="abc"> </div> </body> You have to put this in a document load event. The DOM hasn't gotten to abc by the time the script is executed. Your script runs before the DOM has been loaded. To fix this you can

Get element inside element by class and ID - JavaScript

由 岁酱吖の 提交于 2019-11-26 10:19:19
问题 Alright, I\'ve dabbled in JavaScript before, but the most useful thing I\'ve written is a CSS style-switcher. So I\'m somewhat new to this. Let\'s say I have HTML code like this: <div id=\"foo\"> <div class=\"bar\"> Hello world! </div> </div> How would I change \"Hello world!\" to \"Goodbye world!\" ? I know how document.getElementByClass and document.getElementById work, but I would like to get more specific. Sorry if this has been asked before. 回答1: Well, first you need to select the

Cannot read property &#39;addEventListener&#39; of null

由 谁都会走 提交于 2019-11-26 08:47:38
问题 I have to use vanilla JavaScript for a project. I have a few functions, one of which is a button that opens a menu. It works on pages where the target id exists, but causes an error on pages where the id doesn\'t exist. On those pages where the function cannot find the id, I receive a \"Cannot read property \'addEventListener\' of null \" error and none of my other functions work. Below is the code for the button that opens the menu. function swapper() { toggleClass(document.getElementById(\
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