How to check for null when passing parameters

1

I have a button event that opens a dialog and passes parameters. However, when the form field is null, the button doesn’t work. How do I check for nulls in a parameter that is trying to pass ${annexation.ORDINANCE_NO} where ORDINANCE_NO is null?

2

Hi,

One way to deal with this is to initialize the form field to a non null value. We can help more if we see the code of the page. Can you paste the JSON? It would be in the meta\pages directory.

Best,
Atanas

3

This is an existing database, so I don’t think I want to mess with the null values.

Here’s the JSON (the button is called “Duplicate”):
{
“components”: [
{
“components”: [
{
“class”: “col-md-12”,
“components”: [
{
“events”: {
“click”: [
{
“parameters”: [
{
“name”: “PICTURE”,
“value”: “${annexation.PICTURE}”
},
{
“name”: “ANNEX_YEAR”,
“value”: “${annexation.ANNEX_YEAR}”
},
{
“name”: “ANNEX_DATE”,
“value”: “${annexation.ANNEX_DATE}”
},
{
“name”: “ACRES”,
“value”: “${annexation.ACRES}”
},
{
“name”: “ANNEX_NAME”,
“value”: “${annexation.ANNEX_NAME}”
},
{
“name”: “ORDINANCE_NO”,
“value”: “${annexation.ORDINANCE_NO}”
},
{
“name”: “ANNEX_NO”,
“value”: “${annexation.ANNEX_NO}”
}
],
“path”: “add-annexation-copy”,
“type”: “popup”
}
]
},
“icon”: “”,
“name”: “button0”,
“text”: “Duplicate”,
“type”: “button”
}
],
“name”: “col0”,
“type”: “col”
},
{
“class”: “col-md-12”,
“components”: [
{
“data”: “${annexation}”,
“events”: {
“cancel”: [
{
“type”: “back”
}
],
“submit”: [
{
“error”: [
{
“detail”: “Unable to update Annexation”,
“severity”: “error”,
“summary”: “Error”,
“type”: “notify”
}
],
“name”: “GJFilesAdmin.updateAnnexation”,
“parameters”: [
{
“name”: “OBJNUM”,
“value”: “${parameters.OBJNUM}”
},
{
“name”: “Annexation”,
“value”: “${event}”
}
],
“then”: [
{
“path”: “annexations”,
“type”: “navigate”
}
],
“type”: “invoke”
}
]
},
“fields”: [
{
“disabled”: true,
“property”: “PICTURE”,
“required”: false,
“requiredText”: “is required”,
“title”: “FILE NUMBER”,
“type”: “string”
},
{
“property”: “ANNEX_YEAR”,
“required”: false,
“requiredText”: “is required”,
“title”: “ANNEX YEAR”,
“type”: “number”
},
{
“property”: “ANNEX_DATE”,
“required”: false,
“requiredText”: “is required”,
“title”: “ANNEX DATE”,
“type”: “date”
},
{
“property”: “ACRES”,
“required”: false,
“requiredText”: “is required”,
“title”: “ACRES”,
“type”: “number”
},
{
“property”: “ANNEX_NAME”,
“required”: false,
“requiredText”: “is required”,
“title”: “ANNEX NAME”,
“type”: “string”
},
{
“property”: “ORDINANCE_NO”,
“required”: false,
“requiredText”: “is required”,
“title”: “ORDINANCE NO”,
“type”: “number”
},
{
“property”: “ANNEX_NO”,
“required”: false,
“requiredText”: “is required”,
“title”: “ANNEX NO”,
“type”: “number”
}
],
“name”: “form0”,
“type”: “form”
}
],
“type”: “col”
}
],
“type”: “row”
}
],
“events”: {
“load”: [
{
“name”: “GJFilesAdmin.getAnnexationByOBJNUM”,
“parameters”: [
{
“name”: “OBJNUM”,
“value”: “${parameters.OBJNUM}”
}
],
“then”: [
{
“name”: “annexation”,
“type”: “set”,
“value”: “${result}”
}
],
“type”: “invoke”
}
]
},
“name”: “Edit Annexation”,
“access”: [
“Authenticated”
]
}

4

Thanks!

I see what you mean. Indeed the Angular router components needs a non-null parameter value otherwise it would just skip it.

You can provide a non-null value for a parameter like this:

${annexation.ORDINANCE_NO || 'defaultValue'}

5

Cool. As usual you provide the solution. Thanks.