How and where to call javascript function on back office

[jahyax]

Good day,

 

 

 

on price.js  i created a function like:

 

public function myFunction(){

..................

}

 

and on price.tpl i added custom input just below Pre tax retail price

 

<tr>

<td><input type="text" name="custom_input" class=''custom_input" value=""></td>

</tr>

 

i would my function to called when i hit the save button and verify if the input is correct like:

.....alert('your input is not a number, please input a proper value'),

 

can someone please point me to the right direction where to call the function 'myFunction' so that it will prompt the user to input a proper value before even saving the value into the database..

[vekia]

check this: http://stackoverflow.com/questions/8292156/how-to-validate-the-form-before-submit

[jahyax]

Vekia Good day!

 

thanks for giving the link for javascript form validation. but what i really want to know is where do I place or call the function 'myFunction' so that when I click the save button on the header the value will be validated first before it is being saved..