Develop Reference

Get the value of an <input type="text"> that was created dynamically inside a modal

i would like to get the value of an <input type="text"> that was created dynamically inside a modal and put it into variable "newcomment".
This is how i make the input:
var newcomment;
var p = $("<p>");
p.append("Some text");
p.append("</p>");
p.append("<input type='text'id='comment_text' value='Comment'"+"onblur=newcomment=$('#comment_text').val()"+" onfocus=if(this.value==this.defaultValue)this.value=''>"+"</input>");
$("div.modal-body").append(p);
The problem is when i write something like "ok" inside the textbox in the modal, and after i focusout from the textbox: newcomment seems not update to "ok" and still have the default "Comment" value.

1st: You need to use newcomment=this.value instead of newcomment=$('#comment_text').val()
2nd: No need to add + signs in your input html code while you not trying to concatenate string by putting variables to it
var newcomment;
var p = $("<p>");
p.append("Some text");
p.append("</p>");
p.append("<input type='text' id='comment_text' value='Comment' onblur='newcomment=this.value; alert(newcomment);' onfocus=if(this.value==this.defaultValue)this.value='' />");
$("body").append(p);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Not really the answer here, but might help you get at the root of the problem.
JS:
var newComment, defaultValue;
function doOnBlur(){
newComment = $('#comment_text').val()
}
function doOnFocus(){
if($('#comment_text').val() == defaultValue){
$('#comment_text').val('')
}
}
HTML:
<input type='text' id='comment_text' placeholder='Comment' onblur='doOnBlur()' onfocus='doOnFocus()' />
<!-- inputs dont have a close tag, also should use placeholder for temporary text -->
from here, you can set breakpoints in the debugger and see where your code is going wrong. You can also modify the functions much more easily rather than writing the executing code in the HTML

Get the tag name of a form input value

How does one get the .tagName of a value passed in an HTML form input? This is to check whether the value that has been passed is an 'iFrame'. The input is to only accept iframes
For example:
//HTML
<input type="text" id="iFrame">
<button id="butt">Push</button>
//JavaScript
document.getElementById("butt").onclick = function(){
var iframe = document.getElementById("iFrame").value;
console.log(iframe.tagName);
}

I think you are looking for
var iframe = document.getElementsByTagName("iFrame")

I perhaps did not ask the question in the best way, initially.
I wanted to check if the value passed in the input field was an "iframe" (the input is to only accept iFrames). Since .value returns a string and not an HTML tag, getting the tag name through basic methods would not work. I needed another way.
For anybody else who needs a quick solution, this is how I managed to do it:
document.getElementById("submit").onclick = function(){
var iframe = document.getElementById("iFrame").value;
var check1 = iframe.match(/iframe/g);
var check2 = iframe.match(/frameborder/g);
var check3 = iframe.match(/http:/g);
var check = check1.length + check2.length + check3.length;
if (check === 4) {
alert("good!");
}
}

javascript in html

i am using javascript to change the text of div tag on run time.
how can this be done..
my div tag is as:
<div id="topdiv" style="color:Blue" onmouseover="button1();">
<input type="button" id="btndiv" onclick="edit1();"/>
Div Tag
</div>
i wnt the user to input text on runtime in div and that should be displayed in div.
can someone help me..

It should be innerHTML. innerHTM is not a javascript function.

You don't get a magic variable just by having an element with an id. var something = document.getElementById('some-id')
The property is called innerHTML not innerHTM
innerHTML is a string variable not an function. Assign a value to it with =, don't try to call it with ()

function edit1() {
alert('you are in edit1');
document.getElementById('topdiv').innerHTML = 'hello';
}
and with proper error handling:
function edit1() {
alert('you are in edit1');
var topDiv = document.getElementById('topdiv');
if (topDiv != null) {
topDiv.innerHTML = 'hello';
} else {
alert('topdiv is nowhere to be found in this DOM');
}
}

Try document.getElementById('topdiv').innerHTML = "Hello"

To get the div you should use document.getElementById('topdiv'). There is indeed a WebKit feature, that elements with an ID are automatically expanded as global variables, but it's highly questionable, that this becomes mainstream.
Then, innerHTM should read innerHTML, and you assign directly:
foo.innerHTML = "hi there"

you should use
document.getElementById('topdiv').innerHTML = 'hello';

You should use references instead of ID's, using this.
In that case this means the node that triggers the event.
<div style="color:Blue" onmouseover="button1(this);">
<input type="button" onclick="edit1(this);"/>
Div Tag
</div>
function button1(divRef){
//divRef is the reference to the DIV
}
function edit1(inputRef){
//inputRef is the reference of the INPUT
//inputRef.parentNode is the reference to the DIV
}

function edit1() {
alert('you are in edit1');
document.getElementById('topdiv').innerHTML = 'hello';
}
This should work by specifying the id

In standard JavaScript usage you'd do as per #DarinDimitrov 's answer.
document.getElementById("topdiv").innerHTML = ('hello');
Once you're happy with JavaScript I would suggest you look at the JQuery libraries - the powerful syntax will let you write short, neat code like this:
$("#topdiv").html('hello');

Your file
<div id="topdiv" style="color:Blue" onmouseover="button1();"> Div Tag</div>
<form><input type="button" id="btndiv" value="Edit" onClick="window.open('t2.html','popuppage','width=850,toolbar=1,resizable=1,scrollbars=yes,height=700,top=100,left=100');" value="Open popup"/></form>
t2.html file
function sendValue (s){var selvalue = s.value;window.opener.document.getElementById('topdiv').innerHTML = selvalue;window.close();}
<form name="selectform"><input name="details" value=""><input type=button value="Copy input to parent opener" onClick="sendValue(this.form.details);"></form>
Got Idea from this source enter link description here

How to return a variable from a javascript function into html body

I am still new to javascript, and I am trying to get a function to return a variable using html & javascript. Basically the function should just return whichever radio button that the user clicks on, although at the moment I don't see anything being returned at all.
The function is here:
<script type="text/javascript">
function GetSelectedItem() {
var chosen = ""
len = document.f1.r1.length
for (i = 0; i <len; i++) {
if (document.f1.r1[i].checked) {
chosen = document.f1.r1[i].value
}
}
}
return chosen
</script>
And then in the html section I have these radio buttons, and my attempt to get the variable "chosen" output to the screen.
<form name = f1><Input type = radio Name = r1 Value = "ON" onClick=GetSelectedItem()>On
<Input type = radio Name = r1 Value = "OFF" onClick =GetSelectedItem()>Off</form>
<script type ="text/javascript">document.write(chosen)</script>
At the moment nothing seems to be getting returned from the function (although if I output the variable 'chosen' inside the function then it is working correctly.
Thanks in advance!

Here's a little simpler approach.
First, make a few corrections to your HTML, and create a container to display the output:
<form name = "f1"> <!-- the "this" in GetSelectedItem(this) is the input -->
<input type = "radio" Name = "r1" Value = "ON" onClick="GetSelectedItem(this)">On
<input type = "radio" Name = "r1" Value = "OFF" onClick ="GetSelectedItem(this)">Off
</form>
<div id="output"></div>
Then change your script to this:
<script type="text/javascript">
// Grab the output eleent
var output = document.getElementById('output');
// "el" is the parameter that references the "this" argument that was passed
function GetSelectedItem(el) {
output.innerHTML = el.value; // set its content to the value of the "el"
}
</script>
...and place it just inside the closing </body> tag.
Click here to test a working example. (jsFiddle)

document.write takes a string, and outputs it as part of the HTML. This is not a live value that updates when the variable pointing at the string is updated.
For that, you will need to perform DOM manipulation.

Change your JavaScript function to something like that:
<script type="text/javascript">
function GetSelectedItem() {
len = document.f1.r1.length;
for (i = 0; i <len; i++) {
if (document.f1.r1[i].checked) {
document.getElementById('test').textContent = document.f1.r1[i].value;
}
}
}
</script>
And then in the body:
<div id="test"></div>

As I put in the post. Using JQuery would make your life easy for this kind of task (and many others for the matter). The really nice thing about JQuery is that it often makes your JavaScript syntax much easier then you can learn the nitty gritty details of javascript as you go.
First, add the following script tag into your html page
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script>
Now you have the JQuery API
Then you could rewrite the function like this.
function GetSelectedItem(btnRadio)
{
var jqElem = $(btnRadio);
$('#output').html(jqElem.attr('value')); //attr('<name of attributre'>) gets the value of the selected attribute
}
Your html would look like this
<form name = "f1">
<input type = "radio" name = "r1" value = "On" onclick="GetSelectedItem(this)">On
<input type = "radio" name = "r1" value = "Off" onclick ="GetSelectedItem(this)">Off
</form>
<div id="output">
</div>
More or less, the .html() can both get and set the html of the selected element. So we are just simply inserting the value into the div tag.

Take Postcode to New Field in New Window

I have a read only field on a html field which has a name of _Dataaddr_postcode I now need to capture this data and pass it into a new window which loads another file (proxcomp.asp) and use the data in a field on this page the field has an ID of inpAddr.
I have this code so far
<script type="text/javascript">
var pcodeStart = document.getElementbyId("_Dataaddr_postcode");
var newWindow;
function makeNewWindow( ) {
if (!newWindow || newWindow.closed) {
newWindow = window.open("../hpwprox/proxcomp.asp","sub","status=0,title=0,height=600,width=800");
setTimeout("writeToWindow( )", 50);
} else if (newWindow.focus) {
newWindow.focus( );
}
}
</script>
<input type="button" value="Create New Window" onclick="makeNewWindow();" />
Can someone tell me how to achieve this with some sample code?
Thanks
Justin.

Passing just that one field as a form input to the server-side script:
var genForm = document.createElement("form");
genForm.target = "sub";
genForm.method = "get"; // or "post" if appropriate
genForm.action = "../hpwprox/proxcomp.asp";
var genInput = document.createElement("input");
genInput.type = "hidden";
genInput.name = "inpAddr";
genInput.value = pcodeStart.value;
genForm.appendChild(genInput);
document.body.appendChild(genForm);
if(!newWindow || newWindow.closed) {
window.open("", "sub", "status=0,title=0,height=600,width=800");
} else if(newWindow.focus) {
newWindow.focus();
}
genForm.submit();
If you wish to use client-side code to set a textbox in the pop-up rather than server-side code, you need to do it from the pop-up window to avoid the delay you would add otherwise and the page's load time from "racing" each other. In JavaScript, global variables are properties of the window object they exist inside of, and window.opener gives the window that opened this one. Note that because of the same-origin policy, the two windows need to have the same protocol, hostname, and port number in their URLs.
// Using the variable referring to the text box:
document.getElementById('inpAddr').value = window.opener.pcodeStart.value;
// Or even using getElementById directly:
document.getElementById('inpAddr').value = window.opener.document.getElementById('inpAddr').value
You can omit the window. part of window.opener if you want to, provided that you are using no variable called opener.

Maybe doing this:
newWindow.document.getElementById('inpAddr').value = pcodeStart;
Or from the open window:
document.getElementById('inpAddr').value = opener.document.getElementbyId("_Dataaddr_postcode").value;
Please read this great article!