So confused with Javascript syntax - help!

[Scholin]

I have a button that when pressed, it want it to do something based on what is in a couple of fields on the grid.

So the first javascript is to make sure certain fields are not false or empty.

I have tried many, many different configurations but when it works, I continue to get the same results - that is, what was ever last stored (true/false or the text) remains even though I can clearly see the field's value that it should be checking is different than what the alert box is displaying.

Here are a couple of test samples that I have been working with:

var ssep             =     {grid.Object}.getValue('G','REPORT_READER_SSEP',1); 
var fill_emg        =    {grid.Object}.getValue('G','FILL_EMG',1); 
 
 
if(ssep==''){ 
    alert('Show this.  Fill_EMG= '+fill_emg+'  SSEP Comments:'+ssep); 
return; 
} 
 
if(fill_emg){ 
     alert('Show this.  Fill_EMG= '+fill_emg+'  SSEP Comments:'+ssep); 
return; 
}  

I have tried different browsers, different computers, cleaned out my cache, etc.

My back end is MS SQL.

And when do you use " = vs == "? (I even have seen === in the literature??)

It seems to make a difference if I am using a logical bit and if the grid is a check box vs a text field, as well as on how how I use "true" vs "1" or the assumption that a field is true (ei if(var){ . . .)

I want to know:

1) how to make sure that if the value changes and you can see the change in the grid, the button press will reflect that.

2) What syntax do you use in the above examples for checking if a var is true or false? How many equal signs, etc.

I am sure others are confused as well .. . any good resources for using Javascript with Alpha like this?

Thanks - I appreciate any help!

[Clipper87]

Re: So confused with Javascript syntax - help!

= is used for assigning a value
== is used for comparing values

[Scholin]

Re: So confused with Javascript syntax - help!

Frank,

Now there is a nice clear explanation! Got it - thanks!

Now I need to figure out why my vars are "sticking" and not changing as the actual data is is clearly changing in the grid.

Any ideas?

[workaholic06]

Re: So confused with Javascript syntax - help!

I think your grid values are sticking because your code:

var ssep             =     {grid.Object}.getValue('G','REPORT_READER_SSEP',1);  
var fill_emg        =    {grid.Object}.getValue('G','FILL_EMG',1);  

is assigning the values when the page is generated.

When I want to use Javascript to get the current value on the page, I use something like the following:

var strRow={Grid.RowNumber}; 
var strColourValue=document.getElementById('GRID_APPOI.V.R'+strRow+'.APT_COLOUR').value; 
alert(strColourValue);  

My code above is set on the OnChange javascript for my APT_COLOUR field.

The APT_COLOUR field is a dropdownbox, with multiple HTML colour codes.

When you select a different colour in the drop down, the OnChange javascript event fires, and will show you the colour code selected.

To find the field name (GRID_APPOI.V.R?.APT_COLOUR), you should publish your page, and view it in the browser, then search for the field using View Source. I've noticed that the grid name can be different when viewing with LIVE PREVIEW and viewing in a browser after publishing the page/component.

Hopefully this will help.

Thanks,

Robert

[workaholic06]

Re: So confused with Javascript syntax - help!

An update on this..

i just saw another post that had:

{grid.Object}._getValue......

rather than

{grid.Object}.getValue......



Maybe this was the issue with your original code?

[Scholin]

Re: So confused with Javascript syntax - help!

I actually have another javascript with the {grid.Object}._getValue...... that I had created months ago. When I try using this variation now, it gives an error plus when you use the "Insert Grid method. . ",; that inserts {grid.Object}.getValue...... and that function works without an error.

I guess it must have changed somewhere along the way . . . . but thanks.