Session variable and Show/Hide expression

[Selwyn Rabins]

Re: Session variable and Show/Hide expression

Thank you, that seems like something the developer should be able to control. The disabled text is almost impossible to read in the bright sun.

you will need to ask microsoft to change how Internet Explorer works. Alpha has no control over the built-in behavior of the browser.

[frankbicknell]

Re: Session variable and Show/Hide expression

It would be great if Alpha developed a browser. Think of the enhanced functionality connecting to the alpha server. Just make it so the disabled text color can be changed. I would pay for that.

[mmaisterrena]

Re: Session variable and Show/Hide expression

It would be great if alpha reinvented algebra, you would just use a genie to get a result. ;)

[mpatrizio]

Re: Session variable and Show/Hide expression

Has anyone had luck showing a column that is initially hidden? I can hide and show a column that is initially visible. But I can't show a column whose property starts hidden.

[Selwyn Rabins]

Re: Session variable and Show/Hide expression

Has anyone had luck showing a column that is initially hidden? I can hide and show a column that is initially visible. But I can't show a column whose property starts hidden.

if you set a grid column's 'hidden' property to .t. then that column is not rendered as part of the initial html that is sent to the browser. so therefore it would be impossible for the client-side javascript to later on show it - because there is nothing to show - it is simply not there.

if you want a column to be hidden initially, but to be showable later on, then setting it's 'hidden' property to .t. is the wrong way to do this. You need to make sure that the hidden property is NOT checked. then define a show/hide expression that returns false when the grid is initially rendered.

The 'hidden' property is intended for use when you use free-form html layouts on one or more grid columns.
say you have 3 grid fields: firstname, lastname, and company.
you might hide firstname and lastname, then make company a freeform layout and put the placeholders for firstname and lastname (the two hidden fields) in the freeform layout that you define for the company field.

[MikeC]

Re: Session variable and Show/Hide expression

Just an outsider's take on this...

if you set a grid column's 'hidden' property to .t. then that column is not rendered as part of the initial html that is sent to the browser. so therefore it would be impossible for the client-side javascript to later on show it - because there is nothing to show - it is simply not there.

Sounds like the use of the term "Hidden" then is a misnomer. To me hidden implies presence when apparently, in this scenario, it means it is not.

But a great explanation of what is actually happening which is of more importance perhaps than the confusion it created initially! :)

[workaholic06]

Enable expression and Show/Hide expression

I'm not having any luck using this show/hide expression on a detail view.

I have a field cliID that is included in the field list, and its show/hide expression is set to 1=0. So - it appears in the source view for the page, but is hidden from the user.

i have a button in the field list that I want to appear if the cliID is not Zero, and not appear if the cliId is Zero

I'm using the following enable expression:

not cliID = 0

If I save the grid, I get a script error:

'this._newDVValues' is null or not an object
file:///C:/Document%20and%20Settings/earl/Local%20Settings/Temp/temp.html

Can anyone point me in the right direction here?

Thanks,

Robert

[workaholic06]

Re: Session variable and Show/Hide expression

An update to my post.

cliID is an autoid field - basically on the Detail view, i'm trying to hide the button if I'm on a new record.

I can't use the data.rowNumber in my expression, as when i'm in a detail view ADDING the first new record to an empty table, the value of the rownumber is coming back as 1 the same as if i'm in edit on the first row of the table.

Thanks,

Robert

[christappan]

Re: Session variable and Show/Hide expression

In the button Show/Hide:

cliID > 0

This has worked for me in similar setups.

[Selwyn Rabins]

Re: Session variable and Show/Hide expression

An update to my post.

cliID is an autoid field - basically on the Detail view, i'm trying to hide the button if I'm on a new record.

I can't use the data.rowNumber in my expression, as when i'm in a detail view ADDING the first new record to an empty table, the value of the rownumber is coming back as 1 the same as if i'm in edit on the first row of the table.

Thanks,

Robert

here is how you can hide a button in the detail view if you are on a new record.


1. go to javascript function declarations and define this function

function dvr() {
return {grid.object}._detailViewRow;
}

2. then define this for the show/hide expression

dvr() > 0

here is how this works.

1. _detailViewRow is a property of the Grid object. It is set to -1 when the detail view is showing a new record.

2. then function dvr() therefore returns -1 when you are on a new detail view row and > 0 when you are on an existing record detail view row.

3. the client side show/hide expressions can call any javascript functions that you define - this is an often overlooked, but extremely powerful feature of all of the client side functionality in the grid.

[workaholic06]

Re: Session variable and Show/Hide expression

Works perfectly, thanks Selwyn!

Robert