how to call javascript for textchanged event in htmltextbox? - javascript

I've got two html textboxes (txtFrom and txtTo) which is read-only. These two textboxes are used to show dates from datepicker.
My scenario is when txtTo textbox is filled with date i want to call a javascript which subtracts the two dates (txtTo - txtFrom) and enter the result in another textbox named txtDays.
How can i do this? I can't call onkeypress or onkeyup event since the textbox is read-only.

You can use onchange event of javascript.
In html Section
<asp:TextBox ID="txtTo" runat="server" onchange="DateComparisionJavascriptFun();"></asp:TextBox>
In Javascript Block
<script type="text/javascript">
function DateComparisionJavascriptFun()
{
alert("Validate dates here.");
}
</script>

you should have callback function on that datepicker, when user selects a date it could call this function
dont know if its yours or third party datepicker but he should have defined callback when user selects a date and than it writes it to the text input, you should be able to add your function at this place

The onchange event only fires when the text field loses focus, so that probably won't work for you.
If you're programatically changing the text of the date field, then you should probably just change the other fields at the same time.
If you're going to be doing this sort of thing in more than one place, I'd highly recommend using a data binding framework like Knockout JS, and use a ViewModel with a computed property.

Related

js added onchange not executing

In a table row I have the following inputs button, select, date.
The date field is initially disabled, selecting an option other than "selected" enables the date field using
onchange="functionName(id);"
Clicking the button adds a row. After adding a new row, if I use
element.addEventListener('onchange',function() { functionName(id); });
The onchange doesn't appear in the code, Developer Tools in Chrome. If I use
element.setAttribute("onchange", function(){functionName(id);});
it does appear in the code as
onchange="function (){ReqDate(id);}"
but doesn't execute.
In HTML, the onchange attribute represents what happens on the change event. So in the javascript, you should use addEventListener change, not onchange.
Credit to epascarello in the comments.
Passing the object id as the parameter like so
onchange="functionName(id);"
worked for the initial row, but not for a subsequent (added) row.
"this" works
onchange = function(){functionName(this.id);};
Thanks for the help.

Get onchange event if I don't write in a input text

I have a table and when I click in a row the data of this row is copy to some input text. I have an empty select combobox and this will fill with one thing or another depend the content of the input. I'm ussing the event onchange for do this but it doesn't work because I'm not writing in the input. I put here the relevant code.
<td><input type="text" id="club" value="" onchange="load()"/></td>
function load()
{
var club=document.getElementById("club").value;
alert(club);
}
Pretty and straight forward way of doing this is to use bindings as in some reactive libraries like knockoutjs.
A quick hack is to call your load function in the click handler for a row after all your processing. ( copying text n all).
Firstly, the script in question has to be withing tags if you're defining it inline with html (which I don't recommend)
secondly, you'll need to prepend your function call with javascript: e.g.
onchange="javascript:load()"
I would recommend looking into event listeners or jquery instead, however.
document.getElementById("club").onchange();
Should do the trick. You can fire these events manually!

Which event used in jquery when textbox value get changed using code not by manually?

I am developing a application in MVC.
I have a view which contain another partial view.
I have textbox1 in a parent view but its value get assigned from partial view.
Now, the moment the Textbox1 get assigned with some value, I want to perform some action
like put the 10% value textbox1 value on the another textbox, textbox2 of the view.
( I want the event when textbox value get changed by code, not the manual entry.
so cant use blur() event. )
which event in jquery should I used to perform this task ?
Partials views are all processed server-side, where Javascript is not executed. Javascript only works with the full page and does not know anything about partials, so take this worry out of your question.
As already been mentioned, you need .change() and if that is not good enough, just create a function that updates value of your checkbox and do other stuff which you need doing.
//psudo-code using .trigger()
function updateTextbox(value){
$('#myTexboxId').val(value);
$('#myTexboxId').trigger('change');
}
And here another method where you create another function that updates your values and does the calculation for you.
//pseudo-code using another function
function updateMyTextbox(value){
$('#myTextboxId').val(value);
doCalculation();
}
$('#myTextBoxId').on('change',function(){
doCalculation();
});
function doCalculation(){
// update your other values
}

Setting a field based on a ComboBox selection

I'm not a newb to JavaScript but this is my first foray into Acrobat Scripting.
What I'm trying to do is change a text field based on the value selected in a comboBox.
Since I have many different comboboxes with the same set of options, and many text fields that are supposed to be bound to those, I would prefer a document scope function that could be reused for all of those.
I'm not sure if this is possible but here's what I'm thinking...
Detect when a combo box is changed. On the change event submission, take the export value from that and make it the value for the related text field.
Here's the steps:
capture combo box onmouseup event
detect which combo box triggered the event
match up the name of the combo box to its associated text field using an array listing
use a getField() to fetch the text field
set the text fields value to be the export value of the combo box
Any help with this would be appreciated. Especially good sources about Acrobat event triggers and how they work. I have been through a great deal of the API documentation and can't find anything on it.
Found it!
After exhaustive hours/days of Googling I finally found a solution that works.
The handler function needs to be bound to the 'Keystroke' event.
The handler function should contain:
if(!event.willCommit) {
this.getField('[field]').value = event.change;
}
Note: Where 'field' is the name of the field being updated and event.change is the value selected in the combobox.
To fetch the export value of the selection use the following:
if(!event.willCommit) {
this.getField('[field]').value = event.changeEx;
}
Apparently, 'Keystroke' is fired any time a UI element is interacted with. If you don't want it to execute when the document loads, be sure to bind the handler function to the event during the page load event.
Thoughts: AcroForms JS (Javascript for Acrobat) has a seriously broken event model. If you were to get the value of the combobox while using this even handler it would serve up a stale value. Not only does it take an obscure hack to make it work but there is little/no AcroForms JS community to provide answers to hard questions like these.

onchange event from select box to update field

On this page:
http://www.blackdownluxurylettings.co.uk/place_booking/2010-3-18,2
I am using an onchange event on the "number of days" select box to update the "departure date" field.
But currently nothing is happening.
Any ideas?
Just looking at it quickly: wouldn't you want the ONCHANGE event attached to the SELECT tag rather than the individual options?
You can bind it this way using JQuery:
$("#ddlNumberOfDays").bind('change', mainPharmacy_Change)
Maybe for javascript, you should just try 'change'.
If I recall correctly, the regular Javascript onChange event only fires once the select box loses focus AND it's contents have been changed. I don't know how jQuery achieves it, but their change method will fire whenever the contents are updated.
Also, I get the following error in my Javascript console when loading your page:
[cycle] terminating; zero elements found by selector

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