asked on

How to use onkeydown in Javascript

Dear Experts,

Just want to how to dectect enter key after users input product No: in inputbox.
When users press enter key, the URL will redirect to other link accroding to inputbox
product NO and display page in second frame in the same window of inputbox.
After redirection is completed, the inputbox will be clear for users to be ready
for next edit product No:. So the question, how to write a code for onkeydown to
dectect enter key and do clear inputbox value for user next edit ?

THe following javascript code is finished inputbox, frame set for URL redirect, onclick clear vlaue operation but except final one for detecting enter key to clear input box vlaue for next product
NO edit

Please advise
Ducan

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Testing Input Box</title>

<TITLE>Document Title</TITLE>
<script>
function formSubmit(frm)
{
      document.getElementById("frame1").src="http://www.mywebsite.com/"+frm.text1.value+".htm";
onkeydown="if (event.keyCode==13) {frm.text1.value=''}" 
      return false;
}

</script>

</HEAD>
<body>

<style>
.highlighted { background-color:white; }
</style>

<form onsubmit="return formSubmit(this)">
<input type="text" name="text1" value="0000" onclick="this.value=''; this.className='highlighted'" 
    onblur="if(this.value=='')this.value=this.defaultValue; this.className=''"  /> 
<input type="submit" name="submit" >
</form>
<iframe height="700" width="1400" scrolling="no" border="0px" id="frame1" src="http://www.mywebsite.com/index.htm">
</body>

Open in new window

Bardobrave

Take a look at this:

http://www.w3schools.com/jsref/event_onkeydown.asp

The keyCode for Intro if I remember well is 13

duncanb7

ASKER

I think I could not use onkeydown because there is onclick and onsubmit operation, and I need those two
operation is finished and detecting last key of enter key, so I should put detecting ocde in the function
formSubmit(frm), Right ? but the following code is not working because I don't know what is the event

function formSubmit(frm)
{
document.getElementById("frame1").src="http://www.mywebsite.com/"+frm.text1.value+".htm";
if (event.keyCode==13) {frm.text1.value=''};
return false;
}

TiberiuGal

Hi,
you can use onkeydown without a problem. But the formSubmit function doesn't make sense to me.
here's how I'd write it

<script type="text/javascript">
// e - event, el - element, fn- callback function
function checkEnter(e, el) {

    var key=e.keyCode || e.which;
    if (key==13){
       fn();
       return false;
    }
    return true;
}

function formSubmit() {
   document.getElementById("frame1").src="http://www.mywebsite.com/"+ frm.text1.value +".htm";
}
</script>

<!--  there's no need of a form if you handle it via an iframe -->
<input type="text" ...
onkeydown="return checkEnter(event, this, formSubmit);" />

<input type="button" value="submit" onclick="formSubmit();" />

Open in new window

TiberiuGal

Fix:

TiberiuGal

<script type="text/javascript">
// e - event, el - element, fn- callback function
function checkEnter(e, el, fn) {

    var key=e.keyCode || e.which;
    if (key==13){
       fn();
       return false;
    }
    return true;
}

function formSubmit() {

  var my_val = frm.text1.value;
  // check if value is empty
  if ( my_val.length > 0) { 
    document.getElementById("frame1").src="http://www.mywebsite.com/"+ my_val +".htm";
  }

}
</script>

<!--  there's no need of a form if you handle it via an iframe -->
<input type="text" ...
onkeydown="return checkEnter(event, this, formSubmit);" />

<input type="button" value="submit" onclick="formSubmit();" />

Open in new window

Bardobrave

onKeyDown fires everytime a user press a key within the focused object.

If I understand what you want, you only need to make a function that fires on product number keyDown where you recover the value on product number input, change the action of your form according to this readed value when keyCode pressed is 13 and finally submits the form.

duncanb7

ASKER

Sorry the point is going to expert, TiberiuGal, and I will re-credit in since I score it too fast

duncanb7

ASKER

https://www.experts-exchange.com/questions/26610487/16-Nov-10-15-re-credit-because-of-typing-mistake.html
Sorry again, I already submit re-credit form to EE adm

duncanb7

ASKER

Dear TiberiuGal,

When delete <form onsubmit="return formSubmit(this)"> and then
redirect to www.mywbeiste.com/66666.htm is failed. it is getting worse
than the previous thread

Please advise.

Duncan

duncanb7

ASKER

onkeydown="return checkEnter(event, this, formSubmit);" />

to be repacled by onkeydown="return checkEnter(event, this, formSubmit() );" />

Is it correct ?

TiberiuGal

Hi,
I see, the function formSubmit references the form, we need to change that reference by adding an id attribute to the text box

function formSubmit() {

  var my_val = document.getElementById('text1').value;
  // check if value is empty
  if ( my_val.length > 0) { 
    document.getElementById("frame1").src="http://www.mywebsite.com/"+ my_val +".htm";
  }

}

<input type="text" name="text1" id="text1" ...

Open in new window

duncanb7

ASKER

Okay it is back to previous thread status, for example,

Edit 66666 and Press enter ,and redirect it is sucessful t0 .../66666.htm but
66666 number is still in input box not clear so user needs to click again for next edit.

So, the checkenter is not done yet , Please advise

duncanb7

ASKER

Actually you understand my question ?
Do i need to write it again

duncanb7

ASKER

I mean after enter key is pressed,
formSubmit() function activate first or do first for redirect, and then check enter key operation is next
to clear input box so user doesn't need to click the input box again for next edit

ASKER CERTIFIED SOLUTION

TiberiuGal

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duncanb7

ASKER

Yes, your are right, I also
put el.value='' that is also working

if (key==13){
fn();
el.value='";
return false;

duncanb7

ASKER

Dear TiberiuGal,

Could you comment this new thread at
https://www.experts-exchange.com/questions/26611155/Body-align-to-second-frame-in-javascript.html ?
please advise

Duncan

duncanb7

ASKER

Thanks for all of our reply

If interest , please go to this new thread
https://www.experts-exchange.com/questions/26611155/Body-align-to-second-frame-in-javascript.html