getelementbyid

document.getElementById(“xxxxx”).innerHTML isn't working at all?

由 情到浓时终转凉″ 提交于 2019-12-04 06:43:52
问题 I am having a problem trying to write a String Variable's value to a specific element in the DOM to the specific div. let's say game=TEN document.getElementById("game").innerHTML=game; doesn't write to: <div id="game"></div> Problem is with the code below I have a script and at the end of that script I can document.write(game) and it works fine, but I can't write it to the div? Maybe I am trying to do this wrong. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3

getelementbyclassname instead of getelementbyid is not working

由 无人久伴 提交于 2019-12-04 06:39:36
问题 I have read many times that you can NOW get getElementsByClassName. This below works fine IF I replace ClassName by Id, but using the word ClassName does not work. Anyone know why? (I tried on Chrome and Firefox) <script type="text/javascript"> function makeDisable(){ var x=document.getElementsByClassName("mySelect"); x.disabled=true } function makeEnable(){ var x=document.getElementsByClassName("mySelect"); x.disabled=false } </script> <form> <select class="mySelect" id="mySelect"> <option

Why does document.getElementById() function exist? [duplicate]

由 前提是你 提交于 2019-12-04 04:40:36
This question already has an answer here: Why don't we just use element IDs as identifiers in JavaScript? 4 answers when creating web pages I have always used function var someVariable = document.getElementById('myID'); to get a reference to an element object. It was recently suggested to me that this is not necessary, because there already is such a variable. It's name is equal to the id. I've tested it and it seems to work. <div id="myID">some text</div> <a href="someplace" onclick="alert(myID.innerHTML)">click here</a> This code works and it alerts "some text" as expected. There is just a

Is it possible to draw on multiple canvases at once?

由 感情迁移 提交于 2019-12-03 16:47:18
All of my canvas drawing functions start something like this: function drawMe(){ var canvas = document.getElementById('canvas-id'); var ctx = null; ctx = canvas.getContext('2d'); ... } However I now want to draw the same image on a (variable) number of canvases, is there some alternative to getElementById() (perhaps in jQuery?) which can be used to easily grab more than one at once? Thanks! Josh drawing to multiple canvases will be extremely inefficient, because rendering is one of most expensive operations you can do. what you want to do is to use buffer. you can simply draw from one canvas

document.getElementByID is not a function

由 ε祈祈猫儿з 提交于 2019-12-03 09:22:47
I'm learning jQuery and was following a tutorial, a very strange error has perplexed me. Here's my html : <!doctype html> <html> <head> <title> Simple Task List </title> <script src="jquery.js"></script> <script src="task-list.js"></script> </head> <body> <ul id="tasks"> </ul> <input type="text" id="task-text" /> <input type="submit" id="add-task" /> </body> </html> and The jQuery : $(document).ready(function(){ //To add a task when the user hits the return key $('#task-text').keydown(function(evt){ if(evt.keyCode == 13) { add_task(this, evt); } }); //To add a task when the user clicks on the

getElementById not finding control generated by ASP.net

由 。_饼干妹妹 提交于 2019-12-03 06:10:21
I am simply trying to store a label in a variable in javascript but for some reason this isn't working with document.getElementById('control'); . I know my javascript is linking to my html file fine because everything else works. Here is my javascript code: function performEvapCooledCircuit(txt) { var error = document.getElementById('lblError'); if (txt.value == null || isNaN(txt.value)) { error.style.visibility = "visible"; } } Here is the html code for my label: <asp:Label ID="lblError" class="NormLabel" runat="server" style="color:red; visibility:hidden;" Text="Invalid Input."></asp:Label>

Use of document.getElementById in JavaScript

由 妖精的绣舞 提交于 2019-12-03 03:42:56
Can someone explain what the document.getElementById("demo") line does in the example below? I understand getElementById gets the id of demo but the id is <p id="demo"></p> What exactly is <p id="demo"></p> doing in this code? document.getElementById("age") is clear as it gets the id of age which is the input. function myFunction() { var age,voteable; age = document.getElementById("age").value; voteable = (age < 18)? "Too young" : "Old enough"; document.getElementById("demo").innerHTML = voteable; } <p>Click the button to check the age.</p> Age:<input id="age" value="18" /> <p>Old enough to

Change the Value of h1 Element within a Form with JavaScript

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-03 02:14:31
I have two forms on an HTML5 page. Each form has a name and an id. The second form has an h1 element, which also has a name and an id. How do I change the text of this h1 element on the second form using plain JavaScript? Try: document.getElementById("yourH1_element_Id").innerHTML = "yourTextHere"; You can use this: document.getElementById('h1_id').innerHTML = 'the new text'; document.getElementById("myh1id").innerHTML = "my text" You may try the following: document.getElementById("your_h1_id").innerHTML = "your new text here" You can do it with regular JavaScript this way: document

`getElementById` returning null [duplicate]

由 做~自己de王妃 提交于 2019-12-02 20:19:16
问题 This question already has answers here : Why does jQuery or a DOM method such as getElementById not find the element? (8 answers) Closed 4 years ago . A case of document.getElementById returning null . I've read four other questions in SO, and read the reference on MDN, but I have no clue of what's wrong; please help me. Code is as follows: HTML <button id="btnButton1">Button1!</button><br> <button id="btnButton2">Button2!</button><br> <span id="spanOutPut"></span> Javascript getBYid =

getElementById succeeds once then returns null

由 拈花ヽ惹草 提交于 2019-12-02 14:49:21
问题 I'm new to javascript and this is driving me nuts. I'm attempting to set the text and color of a label ("lblerrmsg") depending upon the value of a flag ("IsValid"). I've written a function in a .js file and have attached it to web site that I built with VS. The function - specifically getElementById('lblErrMsg') works correctly the first time it is called, but in subsquent calls it returns null. (Don't know if this is relevant - but there are no posts between calls to the function.) Following
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