Node JS passing an JavaScript object that could be undefined to pug template
My route needs to pass a series of JavaScript objects to the pug template.
router.get('/edit/:itemObjectId', async function(req, res, next) {
var itemObjectId = req.params.itemObjectId;
var equipmentCategoryArr = ;
var lifeExpectancyArr = ;
var businessUnitResponsibleArr = ;
var item = undefined;
try {
item = await db_item.getItem(itemObjectId);
// Where item["result"] is either undefined or a JavaScript Object. E.g. {"createdAt":"2018-11-07T04:07:44.587Z","updatedAt":"2018-11-07T04:25:18.526Z","item_name":"GM Portable","manufacturer":"GM"}
res.render('editItem', {
title: 'Edit item details', // Give a title to our page
item: item["result"],
equipmentCategoryArr: req.app.locals.equipmentCategoryArr,
lifeExpectancyArr: req.app.locals.lifeExpectancyArr,
businessUnitResponsibleArr: req.app.locals.businessUnitResponsibleArr
});
} catch (err) {
return Promise.reject(JSON.stringify({ "Error": err }));
}
});
Where
item["result"] could be either undefined or a JavaScript object.
On the editItem.pug page, I need to use the item in JavaScript.
block extraScript
script.
console.log(!{JSON.stringify(item)});
However, it renders like "console.log();" if item that was passed is undefined. So !{JSON.stringify(item)} was not rendered at all.
How can I check if item is undefined or not on the fron-end?
javascript node.js express pug
asked Nov 12 at 3:07
alextc
80942449
add a comment |
My route needs to pass a series of JavaScript objects to the pug template.
router.get('/edit/:itemObjectId', async function(req, res, next) {
var itemObjectId = req.params.itemObjectId;
var equipmentCategoryArr = ;
var lifeExpectancyArr = ;
var businessUnitResponsibleArr = ;
var item = undefined;
try {
item = await db_item.getItem(itemObjectId);
// Where item["result"] is either undefined or a JavaScript Object. E.g. {"createdAt":"2018-11-07T04:07:44.587Z","updatedAt":"2018-11-07T04:25:18.526Z","item_name":"GM Portable","manufacturer":"GM"}
res.render('editItem', {
title: 'Edit item details', // Give a title to our page
item: item["result"],
equipmentCategoryArr: req.app.locals.equipmentCategoryArr,
lifeExpectancyArr: req.app.locals.lifeExpectancyArr,
businessUnitResponsibleArr: req.app.locals.businessUnitResponsibleArr
});
} catch (err) {
return Promise.reject(JSON.stringify({ "Error": err }));
}
});
Where
item["result"] could be either undefined or a JavaScript object.
On the editItem.pug page, I need to use the item in JavaScript.
block extraScript
script.
console.log(!{JSON.stringify(item)});
However, it renders like "console.log();" if item that was passed is undefined. So !{JSON.stringify(item)} was not rendered at all.
How can I check if item is undefined or not on the fron-end?
javascript node.js express pug
asked Nov 12 at 3:07
alextc
80942449
Why are you negating the results of JSON.parse? You aren't seeing a false value being logged out?
– Robert Moskal
Nov 12 at 3:19
add a comment |
My route needs to pass a series of JavaScript objects to the pug template.
router.get('/edit/:itemObjectId', async function(req, res, next) {
var itemObjectId = req.params.itemObjectId;
var equipmentCategoryArr = ;
var lifeExpectancyArr = ;
var businessUnitResponsibleArr = ;
var item = undefined;
try {
item = await db_item.getItem(itemObjectId);
// Where item["result"] is either undefined or a JavaScript Object. E.g. {"createdAt":"2018-11-07T04:07:44.587Z","updatedAt":"2018-11-07T04:25:18.526Z","item_name":"GM Portable","manufacturer":"GM"}
res.render('editItem', {
title: 'Edit item details', // Give a title to our page
item: item["result"],
equipmentCategoryArr: req.app.locals.equipmentCategoryArr,
lifeExpectancyArr: req.app.locals.lifeExpectancyArr,
businessUnitResponsibleArr: req.app.locals.businessUnitResponsibleArr
});
} catch (err) {
return Promise.reject(JSON.stringify({ "Error": err }));
}
});
Where
item["result"] could be either undefined or a JavaScript object.
On the editItem.pug page, I need to use the item in JavaScript.
block extraScript
script.
console.log(!{JSON.stringify(item)});
However, it renders like "console.log();" if item that was passed is undefined. So !{JSON.stringify(item)} was not rendered at all.
How can I check if item is undefined or not on the fron-end?
javascript node.js express pug
asked Nov 12 at 3:07
alextc
80942449
My route needs to pass a series of JavaScript objects to the pug template.
router.get('/edit/:itemObjectId', async function(req, res, next) {
var itemObjectId = req.params.itemObjectId;
var equipmentCategoryArr = ;
var lifeExpectancyArr = ;
var businessUnitResponsibleArr = ;
var item = undefined;
try {
item = await db_item.getItem(itemObjectId);
// Where item["result"] is either undefined or a JavaScript Object. E.g. {"createdAt":"2018-11-07T04:07:44.587Z","updatedAt":"2018-11-07T04:25:18.526Z","item_name":"GM Portable","manufacturer":"GM"}
res.render('editItem', {
title: 'Edit item details', // Give a title to our page
item: item["result"],
equipmentCategoryArr: req.app.locals.equipmentCategoryArr,
lifeExpectancyArr: req.app.locals.lifeExpectancyArr,
businessUnitResponsibleArr: req.app.locals.businessUnitResponsibleArr
});
} catch (err) {
return Promise.reject(JSON.stringify({ "Error": err }));
}
});
Where
item["result"] could be either undefined or a JavaScript object.
On the editItem.pug page, I need to use the item in JavaScript.
block extraScript
script.
console.log(!{JSON.stringify(item)});
However, it renders like "console.log();" if item that was passed is undefined. So !{JSON.stringify(item)} was not rendered at all.
How can I check if item is undefined or not on the fron-end?
javascript node.js express pug
javascript node.js express pug
asked Nov 12 at 3:07
alextc
80942449
asked Nov 12 at 3:07
alextc
80942449
asked Nov 12 at 3:07
alextc
80942449
asked Nov 12 at 3:07
alextc
80942449
asked Nov 12 at 3:07
alextc
80942449
80942449
Why are you negating the results of JSON.parse? You aren't seeing a false value being logged out?
– Robert Moskal
Nov 12 at 3:19
add a comment |
Why are you negating the results of JSON.parse? You aren't seeing a false value being logged out?
– Robert Moskal
Nov 12 at 3:19
Why are you negating the results of JSON.parse? You aren't seeing a false value being logged out?
– Robert Moskal
Nov 12 at 3:19
Why are you negating the results of JSON.parse? You aren't seeing a false value being logged out?
– Robert Moskal
Nov 12 at 3:19
add a comment |
1 Answer
1
active
oldest
votes
You can manipulate this in three places, all using the ternary operator ( condition ? ifTrue : ifFalse )
In the route you can switch it from being undefined to an empty object
item: item["result"] ? item["result"] : {}
In the template you could apply the same logic:
console.log(!{ item ? JSON.stringify(item) : '{}' } );
You are going to need to do one of the two things above to make sure that something is getting rendered into the client-side code, otherwise you're going to face a syntax error from an empty expression:
var item = ;
answered Nov 12 at 15:07
Graham
3,523123558
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can manipulate this in three places, all using the ternary operator ( condition ? ifTrue : ifFalse )
In the route you can switch it from being undefined to an empty object
item: item["result"] ? item["result"] : {}
In the template you could apply the same logic:
console.log(!{ item ? JSON.stringify(item) : '{}' } );
You are going to need to do one of the two things above to make sure that something is getting rendered into the client-side code, otherwise you're going to face a syntax error from an empty expression:
var item = ;
answered Nov 12 at 15:07
Graham
3,523123558
add a comment |
You can manipulate this in three places, all using the ternary operator ( condition ? ifTrue : ifFalse )
In the route you can switch it from being undefined to an empty object
item: item["result"] ? item["result"] : {}
In the template you could apply the same logic:
console.log(!{ item ? JSON.stringify(item) : '{}' } );
You are going to need to do one of the two things above to make sure that something is getting rendered into the client-side code, otherwise you're going to face a syntax error from an empty expression:
var item = ;
answered Nov 12 at 15:07
Graham
3,523123558
add a comment |
You can manipulate this in three places, all using the ternary operator ( condition ? ifTrue : ifFalse )
In the route you can switch it from being undefined to an empty object
item: item["result"] ? item["result"] : {}
In the template you could apply the same logic:
console.log(!{ item ? JSON.stringify(item) : '{}' } );
You are going to need to do one of the two things above to make sure that something is getting rendered into the client-side code, otherwise you're going to face a syntax error from an empty expression:
var item = ;
answered Nov 12 at 15:07
Graham
3,523123558
You can manipulate this in three places, all using the ternary operator ( condition ? ifTrue : ifFalse )
In the route you can switch it from being undefined to an empty object
item: item["result"] ? item["result"] : {}
In the template you could apply the same logic:
console.log(!{ item ? JSON.stringify(item) : '{}' } );
You are going to need to do one of the two things above to make sure that something is getting rendered into the client-side code, otherwise you're going to face a syntax error from an empty expression:
var item = ;
answered Nov 12 at 15:07
Graham
3,523123558
answered Nov 12 at 15:07
Graham
3,523123558
answered Nov 12 at 15:07
Graham
3,523123558
answered Nov 12 at 15:07
Graham
3,523123558
3,523123558
add a comment |
add a comment |
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Why are you negating the results of JSON.parse? You aren't seeing a false value being logged out?
– Robert Moskal
Nov 12 at 3:19