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Assign dataset computed field value to global variable

iffizin

Hi,

i want to assign dataset field value to global variable. my dataset has computed colum, which i want to store in global variable. i tried following code

reportContext.getPersistentGlobalVariable("myvalue", this.getRowData().getColumnValue("ITMthreshold"))

but failed with error.

thx

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Comments

mwilliams

Hi Iffizin,

To create a global variable, you'll need to use the setPersistentGlobalVariable function. To retrieve it later you'll use the getPersistentGlobalVariable function.

kevinshih

Hi Michael,

I tried the example you gave above, but get an error. The code I use in the onFetch() method of the dataset is:

reportContext.setGlobalVariable("resourceInterfaceList", this.getRowData().getColumnValue("FIELD_NAME"));

The error I get is:

Caused by: org.eclipse.birt.data.engine.core.DataException: A BIRT exception occurred: There are errors evaluating script "__bm_onFetch()":TypeError: Cannot find function getRowData. (<inline>#2).. See next exception for more information.There are errors evaluating script "__bm_onFetch()":TypeError: Cannot find function getRowData. (<inline>#2). at org.eclipse.birt.data.engine.core.DataException.wrap(DataException.java:118) at org.eclipse.birt.data.engine.script.ScriptEvalUtil.evaluateJSAsExpr(ScriptEvalUtil.java:717) at org.eclipse.birt.data.engine.script.JSMethodRunner.runScript(JSMethodRunner.java:76) at org.eclipse.birt.report.engine.script.internal.DtEScriptExecutor.handleJS(DtEScriptExecutor.java:71) ... 98 moreCaused by: org.eclipse.birt.core.exception.CoreException: There are errors evaluating script "__bm_onFetch()":TypeError: Cannot find function getRowData. (<inline>#2). at org.eclipse.birt.core.script.ScriptContext.eval(ScriptContext.java:307) at org.eclipse.birt.core.script.ScriptContext.eval(ScriptContext.java:268) at org.eclipse.birt.data.engine.script.ScriptEvalUtil.evaluateJSAsExpr(ScriptEvalUtil.java:713) ... 100 moreCaused by: org.mozilla.javascript.EcmaError: TypeError: Cannot find function getRowData. (<inline>#2)

I am using Birt 2.3.2.

Thanks,

Kevin

kevinshih

Hi Michael,

Also tried this in the onFetch() method:

reportContext.setGlobalVariable("resourceInterfaceList", row["resourceInterfaceList"]);

but the variable comes back null when I call it later in the report

chorton

Any updates on this? I'm having the same issue. Can't get a value from the data set into a global variable.

mwilliams

Hi chorton,

Are you using just globalVariable or persistentGlobalVariable? And where are you having this issue? Can you explain more? Thanks.

chorton

Sorry, I created a new post before I realized you commented on this one.
Here's the content from the other post:
"
This is what I have in the initialize method of the report.
reportContext.setPersistentGlobalVariable("BeginningBalance", 5);

This is what I have in the onCreate method of a label element.
reportContext.getPersistentGlobalVariable("BeginningBalance");

Doesn't work."

mwilliams

I went ahead and answered in the other thread. Let me know in there if what I said works for you. 
 
Link to other thread: 
<a class='bbc_url' href='http://www.birt-exchange.org/forum/designing-birt-reports/19531-trouble-persistent-variables.html'>http://www.birt-exchange.org/forum/designing-birt-reports/19531-trouble-persistent-variables.html</a>

rk1981

Hello,
I have problems with global variables, I have a chart and a grid and i am programming in the script
In the grid script I have this ----> reportContext.setPersistentGlobalVariable("row[A_UNIT_VAL]",max)
 
and in the chart script i have this ---> 
function beforeDrawLegendItem( lerh, bounds, icsc )
{
 
var max = icsc.getExternalContext().getScriptable().getPersistentGlobalVariable("max");
var x = lerh.getLabel().getCaption().getValue(); 
 
 
 
lerh.getLabel().getCaption().setValue(x + " " + max);
 
}
 
but the value always is null, row[A_UNIT_VAL] represents a excel column with the same number
 
i hope that you can help me

Clement Wong

rk1981,
 
It looks like your syntax to set the PGV is not correct. It should be swapped like this: 
<pre class="_prettyXprint">
reportContext.setPersistentGlobalVariable (name_of_variable,value_of_variable);</pre>
Also, I'm not sure where you are trying to set the PGV to get the value of the column A_UNIT_VAL. For example, if it's in the onCreate, you may need to use this syntax to access the row's column value:
<pre class="_prettyXprint">
var theColumnValue = this.getRowData().getColumnValue("A_UNIT_VAL");
</pre>