I am having an issue trying to trigger the test() function when updating the input of type text "testName" using the DOM. Does it have something to do with the DOM itself? It works when I am directly clicking on the input of type text and modify it, but not when another JS function access it through DOM to modify it.
document.getElementById('testID').value = "test";
Thank you
If you need to trigger the onchange event your code has to be like shown below
document.getElementById('testID').value = "test";
document.getElementById('testID').onchange();
Hope this solves your problem.
unlike a text field, a text area has no value that gets populated. make a div with id="testID" inside the text area and use that instead.
document.getElementById("testID").innerHTML="New text!";
if it is a text field, then your code should owrk
document.getElementById('testID').value = "something";
what are you using to trigger the event? onclick? onchange? what's it related to
Related
I want to change text element with javascript code and click the button. I'm changing html text value with javascript code :
document.getElementsByName('query')[0].value = "test";
and i'm focusing in that element with :
document.getElementsByClassName('input choice-input text-input')[0].focus();
and then i'm clicking the button :
document.getElementsByClassName('choice-input load-button')[0].click();
But at the end the text element still has old variable in it. It's looks like working but it's just visually i guess. When i type some character after running
document.getElementsByName('query')[0].value = "test";
code and then delete it manually it's working. I think i should change text element with another code or i have to refresh it somehow. Thanks!
I'm beginner in javascript. I got an assignment to know about onchange keyword in javascript. i had seen this function is using different controls. I was unable where exactly to use this function.
what is onchange() in javascript? and for which controls we will use ? why will use in onchange() ?
please Explain in briefly with example?
The onchange property is fired when the element loses the focus or the content of the element have changed since the last time. It works <input>, <select>, and <textarea> elements
Here is an example of onchange applied on input type='text'
JS
function showContent(elem) {
var value = elem.value;
alert(value)
}
HTML
<input type="text" onchange="showContent(this)">
Here the onchange event eill fire as soon as tab or focus out of the element
You can use onchange with other input type like radio,checkbox,file
DEMO
I'm trying to start a project that requires that the javascript know every word that's typed in. An example of something I would try to accomplish would be that you would type 4 + 4, the interpreter on the webpage knows what you mean, and automatically puts = 8 on to the end of that line to show it's computed it, without having to submit anything or press any button.
I've looked into the element, but I don't want to reinvent the wheel or go against what the spec says. With putting a <textarea> as input on top of a canvas, the javascript on the page can only know what is in the textbox when the user submits the text. Is there anything out there that would help with this?
Thanks in advance!
To get the value of a textarea you can just access it via the DOM:
var textArea = document.getElementById("id-of-textarea");
To the textarea you can attach different eventlisteners, and in your case I would use onkeypress
textArea.onkeypress = function () {
var ta_value = textArea.value;
alert(ta_value);
}
Of course you'd have to write your own interpreter, I wouldn't recommend running eval on the input...
try adding a hidden input element and give it the focus when the page load is complete, and use the onkeyup handler to do whatever u want.
I need to live update a text field in html using javascript, that is as the user is typing text in one field, the contents are being displayed in another as they type. i need just a short code snippet to do that. eg as a person is typing their name, the name is being typed one letter at a time at another position on the screen.
Give the two fields an id each, then use something like this:
document.getElementById("field1").onkeyup = function() {
document.getElementById("field2").value = this.value;
}
All it does is bind an event listener to the onkeyup event, which fires every time a key is released. In the event listener, it simply copies the value of the field which received the event to another field, specified by id.
Here's a working example.
I have a calendar which comprise of an input tag and an image on click of image calendar popups comes and sets the value for input tag using javascript.
now i have added onchange event on input tag which doesnt gets triggered since m changing the value using javascript, so what should be done to trigger it i dont want to trigger it explcitly
i tried focusing on input on click of image and focus out on setting the data(into input element) but it didnt worked any workaround?
You can call the onchange handler manually.
Example: http://jsfiddle.net/NQCy7/
element.value = 'new value';
element.onchange();
just tested what you described, it's the same problem here.
a simple workaround would be to call the onchange-method directly (where you're doing the .focus()/.blur() now)