how to get a div with javascript "this" keyword - javascript

I will give you a snippet to show you what I want to achieve and what I got instead.
function myfunc(){
var qwertyui = this.innerHTML;
document.getElementById('mydiv').innerHTML = qwertyui;
}
<input type="text" onkeyup="myfunc(this)"/>
<div id="mydiv"></div>
I wanted to get the innerHTML of the input through the JavaScript "this" keyword, but now it tells me undefined.

You need to accept the element as the parameter. Furthermore, you should get the value of the input to obtain what the user entered, as opposed to its innerHTML.
function myfunc(elem){
document.getElementById('mydiv').innerHTML = elem.value;
}
<input type="text" onkeyup="myfunc(this)"/>
<div id="mydiv"></div>

Related

Want to connect input with variable in Java Script

I want to suggest a variable which contain data by user from input section and store it into my variable so how I can do this in JavaScript? I suggest a = .... but that does not work as expected
let a = document.getElementById("link");
function lol() {
document.getElementById("print").innerHTML = `a`;
}
<input type="text" id="link" name="link">
<button id="btn" onclick="lol()">Upload Video</button>
<p id="print"></p>
You have to pass event and it's target value not only make reference from input to paragraph.
Adrian
function lol() {
document.getElementById("print").innerText = a.value;
}
Use innerText instead of innerHtml to avoid html syntax passed through that input.
If you put variable name in parentheses it will treat it as text and not variable.
And a is input field with many options, to access value you use a.value

How can I call functions using onkeypress-events in EJS file?

I'm trying to accomplish a live character counter for a text input field, but cannot seem to make it work. The onkeypress-function either go as undefined or is just called once when loading the page
Simply assigning the function with onkeypress=" " does not seem to work.
Additionally, I want to update the text of charcountLabel; which I cannot seem to do. Simply using 'document.getElementById' for updating its innerHTML does not work.
How do I correctly assign keypress-functions to html-elements in .ejs?
How do I access and update innerHTML of other elements?
See code below:
<input type="text" id="textContent" onkeypress="charcount">
// Should be live-updated with the length of input text above.
<span id="charcountLabel"> 0 </span>
<script>
function charcount() {
var characterCount = document.getElementById("textContent").innerText.length;
document.getElementById("charcountLabel").innerHTML = characterCount;
}
</script>
Here you are
<input type="text" id="textContent" onkeypress="charcount()">
<!-- Should be live-updated with the length of input text above. -->
<span id="charcountLabel">0</span>
<script>
function charcount() {
var characterCount = document.getElementById("textContent").value.length;
document.getElementById("charcountLabel").innerHTML = characterCount;
}
</script>
Use parenthesis () to call the function and replace innerText with value property.
Note that // is comment in Javascript, not in html where you should use <!-- your comment --> instead.
Last, it has nothing to do with ejs.

Contact form 7 Submit Button’s Click Function [duplicate]

How do I change the case of a character in a textbox/textarea to lowercase onchange?
<html>
<head>
<title>Page Title</title>
<script>
function f2(string)
{
string=string.toUpperCase();
alert(string);
}
</script>
</head>
<body>
<p>Here are my text entry objects:</p>
<form>
<p>
Change the scripting (still using one function) so that the text from the alert is shown in uppercase from the textbox but lowercase from the textarea:<br>
<textarea onchange='f2(this.value);'></textarea>
</p>
</form>
</body>
Have you tried;
function f2(textarea)
{
string = textarea.value;
alert(string);
string = string.toLowerCase();
textarea.value = string;
}
With the modification to the onChange as;
<textarea onchange='f2(this);'></textarea>
Simply change the value and assign it back.
<textarea onchange='this.value=this.value.toLowerCase();'></textarea>
Because nobody fixed your code
HTML:
<p>Here are my text entry objects:</p>
<form>
<p>
Change the scripting (still using one function) so that the text from the alert is shown in uppercase from the textbox but lowercase from the textarea:<br>
<textarea></textarea>
</p>
JS:
document.getElementsByTagName("textarea")[0].addEventListener("change", function () {
this.value = this.value.toLowerCase();
});
You want to add a change event handler. Inside the event handler you merely overwrite the value property of the element with the string changed to lowerCase.
I also fixed your in-line javascript in your HTML. It is the devil, avoid it.
Live Example
Just use the .toLowerCase() method.
Use onchange='this.value = this.value.toUpperCase();' to make the text uppercase. Replace toUpperCase with toLowerCase for the opposite.
If desired, you can use your own function instead of just toUpperCase, passing either just the textarea's value or the entire textarea. For example (value only):
<!-- HTML -->
<textarea onchange='this.value = f2(this.value);'></textarea>
// JavaScript
function f2(oldText) {
var newText = oldText.toUpperCase();
return newText;
}
Or (entire textarea):
<!-- HTML -->
<textarea onchange='f3(this);'></textarea>
// JavaScript
function f3(ta) {
ta.value = ta.value.toUpperCase();
}
I would pass this and then work on it like a DOMNode:
<p>Here are my text entry objects:</p>
<form>
<p>
Change the scripting (still using one function) so that the text from the alert is shown in uppercase from the textbox but lowercase from the textarea:<br>
<textarea onchange='f2(this);'></textarea>
</p>
</form>
function f2(el) {
el.value = el.value.toLowerCase();
}
http://jsfiddle.net/HDR8t/1
Problem 1
I believe the onchange event only gets fired when the <textarea> no longer has focus. Instead, you'll want to use the onkeyup event.
Problem 2
You're only passing the string to the function. If you want to change the actual text in the <textarea>, you'll need to pass the actual DOM element to your function:
<textarea onkeyup="f3(this)"></textarea>
Problem 3
Once you pass the element into your function, you'll need to update its value attribute:
function f3(elem) {
elem.value = elem.value.toLowerCase();
}
Try the [.toLowerCase()][1] method.
<textarea onchange='this.value=this.value.toLowerCase();'></textarea>

Setting HTML textbox value using javascript function?

I'm using this code to set the HTML textbox value using Javascript function. But it seems to be not working. Can anyone point out, what is wrong with this code?
Whats your Name?
<input id="name" value="" />
<script type="text/javascript">
function setValue(value){
var myValue=value;
document.getElementsById("name").value = myValue;
}
</script>
the "value" is came from my android java class using this codes
String value = "Isiah";
WebView web = (WebView) findViewById(R.id.web1);
web.getSettings().setJavaScriptEnabled(true);
web.loadUrl("file:///android_asset/www/webpage");
web.loadUrl("javascript:setValue("+ value +")");
function setValue(value) {
var myValue=value; //unnecessary
document.getElementById("name").value= myValue;
}
But then as pointed out in the comments, you need to call setValue(value) somewhere in your code. Right now you just defined the function is never called.
You could either access the element’s value by its name:
document.getElementsByName("textbox1"); // returns a list of elements with name="textbox1"
document.getElementsByName("textbox1")[0] // returns the first element in DOM with name="textbox1"
So:
input name="buttonExecute" onclick="execute(document.getElementsByName('textbox1')[0].value)" type="button" value="Execute" />
Or you assign an ID to the element that then identifies it and you can access it with getElementById:
<input name="textbox1" id="textbox1" type="text" />
<input name="buttonExecute" onclick="execute(document.getElementById('textbox1').value)" type="button" value="Execute" />
You are using document.getElementsById("name") it should be document.getElementById("name")
not Elements it is Element
You are not linking the function to anything. For example, a click:
<input id="name" value="" onclick="javascript:this.value=12;"/>
Replace the onclick attribute for your desired function, whatever it does (you need to be more specific)
Also, there is no language attribute (at least not anymore) use type="text/javascript" instead
Here is a fiddle: http://jsfiddle.net/4juEp/
Click the input to see it working.
Look at this second fiddle. http://jsfiddle.net/4juEp/1/
which loads whatever is defined in the hid input to the name input.
Firstly, you have a typo in your javascript function i.e. you have used getElementsById as compared to getElementById
To set the value of the textbox on page load, I suggest you use an alternative
<body onload="setValue('yourValueToSet');">
<!-- Your usual html code in the html file -->
</body>
I think you are missing the quotes,
try,
web.loadUrl("javascript:setValue('"+ value +"')");
also consider about the typo.
Check this out:
<body onload="setvalue($value);">
Whats your Name?<input id="name" name="name" value=""/>
<script type="text/javascript">
function setValue(value){
document.{formname}.name.value = value;}</script>
It's not Elements
It's Element
You should use document.getElementById('object-id');

How to refer to a javascript variable in a value field?

I'd like to refer to a variable ("special") in field later in the same script. I've gotten the variable to display with alert boxes and document.write, but don't now how to make to apply its value to the value field in
var special=(10000-health);
var health=(100);
<input style="background:#FF7777;" readonly="readonly" type="text" value="special" id="special" />
this just writes "special" to the box, when I would like the value instead.
You have to set the value explicitly:
document.getElementById('special').value = special;
Note: You can only access the element after it was parsed in the DOM. To be sure, you can insert this part of the script after the element in the HTML. Often JavaScript code is added just before the closing body tag or is only executed when the load event fires. For more information, see Where to place JavaScript in a HTML file.
Update: Here is an example:
<body>
<input style="background:#FF7777;" readonly="readonly" type="text" value="special" id="special" />
<script type="text/javascript">
var health = 100;
var special = 10000 - health;
document.getElementById('special').value = special;
</script>
</body>
References: getElementById, DOM
MDC's JavaScript Guide is also worth reading.
document.getElementById('special').value = special;
you have to use some kind of DOM manipulation. One of the more popular libraries is JQuery.
using jQuery you'd write something like
$('#special').val(special);
var input = document.getElementById('special');
input.value = special;

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