Mixing
Beginner JavaScript, JSON indexing question: why is my (for … in) script failing?
I am not a seasoned Javascript coder or even too familiar with JSON. My approach is likely very naive. Recommendations for better approaches are welcome.
Here's my code.
<!DOCTYPE html>
<html>
<head>
<script>
database = {
"name": "AdventureWorks2012 vs AdventureWorksModified",
"children": [{
"name": "Person",
"children": [{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
},{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
}]
},{
"name": "PersonDELETEmePLEASE",
"children": [{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
}]
}]
}
console.log(`name : ${database.name}`);
console.log("=SCHEMAS=");
for (var i in database.children){
console.log(`name : ${database.children[i].name}`);
console.log("children: (-TABLES-)");
for (var j in database.children){
console.log(`name : ${database.children[i].children[j].name}`);
console.log("children: (-COLUMNS-)");
for (var k in database.children[i].children[j].children){
console.log(`name : ${database.children[i].children[j].children[k].name}`);
console.log("children: (-DATA-)");
for (var l in database.children[i].children[j].children[k].attributes){
console.log(`${l} : ${database.children[i].children[j].children[k].attributes[l]}`);
}
}
}
console.log("nnn");
}
</script>
</head>
<body>
</body>
</html>
The structure is database -> schemas -> tables -> columns + column data.
AdventureWorks2012 vs AdventureWorksModified -> Person -> Address -> AddressID + attributes.
As mentioned in the title, I am trying to iterate through some JSON data. Whether if outputted to HTML or to the console, I run into an error on a strange condition: whenever a schema has just ONE table. It can have one child, or one data member, but it MUST have more than one table.
This is the error I get:
Please aid my understanding: what's in my looping causes this to happen? I want to ask before I start looking for workarounds and end up leading myself into a ditch.
Thanks for any help.
javascript json for-loop indexing
edited Nov 19 '18 at 19:54
kit
1,1063716
asked Nov 19 '18 at 18:39
WerewoofWerewoof
74
add a comment |
I am not a seasoned Javascript coder or even too familiar with JSON. My approach is likely very naive. Recommendations for better approaches are welcome.
Here's my code.
<!DOCTYPE html>
<html>
<head>
<script>
database = {
"name": "AdventureWorks2012 vs AdventureWorksModified",
"children": [{
"name": "Person",
"children": [{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
},{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
}]
},{
"name": "PersonDELETEmePLEASE",
"children": [{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
}]
}]
}
console.log(`name : ${database.name}`);
console.log("=SCHEMAS=");
for (var i in database.children){
console.log(`name : ${database.children[i].name}`);
console.log("children: (-TABLES-)");
for (var j in database.children){
console.log(`name : ${database.children[i].children[j].name}`);
console.log("children: (-COLUMNS-)");
for (var k in database.children[i].children[j].children){
console.log(`name : ${database.children[i].children[j].children[k].name}`);
console.log("children: (-DATA-)");
for (var l in database.children[i].children[j].children[k].attributes){
console.log(`${l} : ${database.children[i].children[j].children[k].attributes[l]}`);
}
}
}
console.log("nnn");
}
</script>
</head>
<body>
</body>
</html>
The structure is database -> schemas -> tables -> columns + column data.
AdventureWorks2012 vs AdventureWorksModified -> Person -> Address -> AddressID + attributes.
As mentioned in the title, I am trying to iterate through some JSON data. Whether if outputted to HTML or to the console, I run into an error on a strange condition: whenever a schema has just ONE table. It can have one child, or one data member, but it MUST have more than one table.
This is the error I get:
Please aid my understanding: what's in my looping causes this to happen? I want to ask before I start looking for workarounds and end up leading myself into a ditch.
Thanks for any help.
javascript json for-loop indexing
edited Nov 19 '18 at 19:54
kit
1,1063716
asked Nov 19 '18 at 18:39
WerewoofWerewoof
74
In your second for loop (for (var j in database.children)) i believe it should readfor (var j in database.children[i].children)
– dotconnor
Nov 19 '18 at 18:45
1
FYI: JSON is a textual notation for data exchange. (More here.) If you're dealing with JavaScript source code, and not dealing with a string, you're not dealing with JSON. What you have there is just an object.
– T.J. Crowder
Nov 19 '18 at 18:46
1
That is not JSON, it is a JavaScript object literal. JSON is always a string.
– Amy
Nov 19 '18 at 18:46
Okay, thanks for the clarifications. I'll keep these in mind.
– Werewoof
Nov 19 '18 at 19:26
add a comment |
I am not a seasoned Javascript coder or even too familiar with JSON. My approach is likely very naive. Recommendations for better approaches are welcome.
Here's my code.
<!DOCTYPE html>
<html>
<head>
<script>
database = {
"name": "AdventureWorks2012 vs AdventureWorksModified",
"children": [{
"name": "Person",
"children": [{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
},{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
}]
},{
"name": "PersonDELETEmePLEASE",
"children": [{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
}]
}]
}
console.log(`name : ${database.name}`);
console.log("=SCHEMAS=");
for (var i in database.children){
console.log(`name : ${database.children[i].name}`);
console.log("children: (-TABLES-)");
for (var j in database.children){
console.log(`name : ${database.children[i].children[j].name}`);
console.log("children: (-COLUMNS-)");
for (var k in database.children[i].children[j].children){
console.log(`name : ${database.children[i].children[j].children[k].name}`);
console.log("children: (-DATA-)");
for (var l in database.children[i].children[j].children[k].attributes){
console.log(`${l} : ${database.children[i].children[j].children[k].attributes[l]}`);
}
}
}
console.log("nnn");
}
</script>
</head>
<body>
</body>
</html>
The structure is database -> schemas -> tables -> columns + column data.
AdventureWorks2012 vs AdventureWorksModified -> Person -> Address -> AddressID + attributes.
As mentioned in the title, I am trying to iterate through some JSON data. Whether if outputted to HTML or to the console, I run into an error on a strange condition: whenever a schema has just ONE table. It can have one child, or one data member, but it MUST have more than one table.
This is the error I get:
Please aid my understanding: what's in my looping causes this to happen? I want to ask before I start looking for workarounds and end up leading myself into a ditch.
Thanks for any help.
javascript json for-loop indexing
edited Nov 19 '18 at 19:54
kit
1,1063716
asked Nov 19 '18 at 18:39
WerewoofWerewoof
74
I am not a seasoned Javascript coder or even too familiar with JSON. My approach is likely very naive. Recommendations for better approaches are welcome.
Here's my code.
<!DOCTYPE html>
<html>
<head>
<script>
database = {
"name": "AdventureWorks2012 vs AdventureWorksModified",
"children": [{
"name": "Person",
"children": [{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
},{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
}]
},{
"name": "PersonDELETEmePLEASE",
"children": [{
"name": "Address",
"children": [{
"name": "AddressID",
"attributes": {
"coltype": "int",
"coldefault": null,
"colordinal": 1,
"colCharLength": null
}
}]
}]
}]
}
console.log(`name : ${database.name}`);
console.log("=SCHEMAS=");
for (var i in database.children){
console.log(`name : ${database.children[i].name}`);
console.log("children: (-TABLES-)");
for (var j in database.children){
console.log(`name : ${database.children[i].children[j].name}`);
console.log("children: (-COLUMNS-)");
for (var k in database.children[i].children[j].children){
console.log(`name : ${database.children[i].children[j].children[k].name}`);
console.log("children: (-DATA-)");
for (var l in database.children[i].children[j].children[k].attributes){
console.log(`${l} : ${database.children[i].children[j].children[k].attributes[l]}`);
}
}
}
console.log("nnn");
}
</script>
</head>
<body>
</body>
</html>
The structure is database -> schemas -> tables -> columns + column data.
AdventureWorks2012 vs AdventureWorksModified -> Person -> Address -> AddressID + attributes.
As mentioned in the title, I am trying to iterate through some JSON data. Whether if outputted to HTML or to the console, I run into an error on a strange condition: whenever a schema has just ONE table. It can have one child, or one data member, but it MUST have more than one table.
This is the error I get:
Please aid my understanding: what's in my looping causes this to happen? I want to ask before I start looking for workarounds and end up leading myself into a ditch.
Thanks for any help.
javascript json for-loop indexing
javascript json for-loop indexing
edited Nov 19 '18 at 19:54
kit
1,1063716
asked Nov 19 '18 at 18:39
WerewoofWerewoof
74
edited Nov 19 '18 at 19:54
kit
1,1063716
asked Nov 19 '18 at 18:39
WerewoofWerewoof
74
edited Nov 19 '18 at 19:54
kit
1,1063716
edited Nov 19 '18 at 19:54
kit
1,1063716
edited Nov 19 '18 at 19:54
kit
1,1063716
1,1063716
asked Nov 19 '18 at 18:39
WerewoofWerewoof
74
asked Nov 19 '18 at 18:39
WerewoofWerewoof
74
asked Nov 19 '18 at 18:39
WerewoofWerewoof
74
74
In your second for loop (for (var j in database.children)) i believe it should readfor (var j in database.children[i].children)
– dotconnor
Nov 19 '18 at 18:45
1
FYI: JSON is a textual notation for data exchange. (More here.) If you're dealing with JavaScript source code, and not dealing with a string, you're not dealing with JSON. What you have there is just an object.
– T.J. Crowder
Nov 19 '18 at 18:46
1
That is not JSON, it is a JavaScript object literal. JSON is always a string.
– Amy
Nov 19 '18 at 18:46
Okay, thanks for the clarifications. I'll keep these in mind.
– Werewoof
Nov 19 '18 at 19:26
add a comment |
In your second for loop (for (var j in database.children)) i believe it should readfor (var j in database.children[i].children)
– dotconnor
Nov 19 '18 at 18:45
1
FYI: JSON is a textual notation for data exchange. (More here.) If you're dealing with JavaScript source code, and not dealing with a string, you're not dealing with JSON. What you have there is just an object.
– T.J. Crowder
Nov 19 '18 at 18:46
1
That is not JSON, it is a JavaScript object literal. JSON is always a string.
– Amy
Nov 19 '18 at 18:46
Okay, thanks for the clarifications. I'll keep these in mind.
– Werewoof
Nov 19 '18 at 19:26
In your second for loop (
for (var j in database.children)) i believe it should read for (var j in database.children[i].children)– dotconnor
Nov 19 '18 at 18:45
In your second for loop (
for (var j in database.children)) i believe it should read for (var j in database.children[i].children)– dotconnor
Nov 19 '18 at 18:45
1
1
FYI: JSON is a textual notation for data exchange. (More here.) If you're dealing with JavaScript source code, and not dealing with a string, you're not dealing with JSON. What you have there is just an object.
– T.J. Crowder
Nov 19 '18 at 18:46
FYI: JSON is a textual notation for data exchange. (More here.) If you're dealing with JavaScript source code, and not dealing with a string, you're not dealing with JSON. What you have there is just an object.
– T.J. Crowder
Nov 19 '18 at 18:46
1
1
That is not JSON, it is a JavaScript object literal. JSON is always a string.
– Amy
Nov 19 '18 at 18:46
That is not JSON, it is a JavaScript object literal. JSON is always a string.
– Amy
Nov 19 '18 at 18:46
Okay, thanks for the clarifications. I'll keep these in mind.
– Werewoof
Nov 19 '18 at 19:26
Okay, thanks for the clarifications. I'll keep these in mind.
– Werewoof
Nov 19 '18 at 19:26
add a comment |
1 Answer
1
active
oldest
votes
Your two loops loop over the same thing
for (var i in database.children) { <-- same
for (var j in database.children) <-- same
You forgot to reference the nesting
for (var i in database.children) { <-- first level
for (var j in database.children[i].children) <-- second level
console.log(database.children[i].children[j])
answered Nov 19 '18 at 18:45
epascarelloepascarello
151k13131179
1
Oh wow, I am a dense oatmeal cookie. Thank you a ton good sir.
– Werewoof
Nov 19 '18 at 18:56
add a comment |
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1 Answer
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1 Answer
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active
oldest
votes
Your two loops loop over the same thing
for (var i in database.children) { <-- same
for (var j in database.children) <-- same
You forgot to reference the nesting
for (var i in database.children) { <-- first level
for (var j in database.children[i].children) <-- second level
console.log(database.children[i].children[j])
answered Nov 19 '18 at 18:45
epascarelloepascarello
151k13131179
1
Oh wow, I am a dense oatmeal cookie. Thank you a ton good sir.
– Werewoof
Nov 19 '18 at 18:56
add a comment |
Your two loops loop over the same thing
for (var i in database.children) { <-- same
for (var j in database.children) <-- same
You forgot to reference the nesting
for (var i in database.children) { <-- first level
for (var j in database.children[i].children) <-- second level
console.log(database.children[i].children[j])
answered Nov 19 '18 at 18:45
epascarelloepascarello
151k13131179
1
Oh wow, I am a dense oatmeal cookie. Thank you a ton good sir.
– Werewoof
Nov 19 '18 at 18:56
add a comment |
Your two loops loop over the same thing
for (var i in database.children) { <-- same
for (var j in database.children) <-- same
You forgot to reference the nesting
for (var i in database.children) { <-- first level
for (var j in database.children[i].children) <-- second level
console.log(database.children[i].children[j])
answered Nov 19 '18 at 18:45
epascarelloepascarello
151k13131179
Your two loops loop over the same thing
for (var i in database.children) { <-- same
for (var j in database.children) <-- same
You forgot to reference the nesting
for (var i in database.children) { <-- first level
for (var j in database.children[i].children) <-- second level
console.log(database.children[i].children[j])
answered Nov 19 '18 at 18:45
epascarelloepascarello
151k13131179
answered Nov 19 '18 at 18:45
epascarelloepascarello
151k13131179
answered Nov 19 '18 at 18:45
epascarelloepascarello
151k13131179
answered Nov 19 '18 at 18:45
epascarelloepascarello
151k13131179
151k13131179
1
Oh wow, I am a dense oatmeal cookie. Thank you a ton good sir.
– Werewoof
Nov 19 '18 at 18:56
add a comment |
1
Oh wow, I am a dense oatmeal cookie. Thank you a ton good sir.
– Werewoof
Nov 19 '18 at 18:56
1
1
Oh wow, I am a dense oatmeal cookie. Thank you a ton good sir.
– Werewoof
Nov 19 '18 at 18:56
Oh wow, I am a dense oatmeal cookie. Thank you a ton good sir.
– Werewoof
Nov 19 '18 at 18:56
add a comment |
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In your second for loop (
for (var j in database.children)) i believe it should readfor (var j in database.children[i].children)– dotconnor
Nov 19 '18 at 18:45
1
FYI: JSON is a textual notation for data exchange. (More here.) If you're dealing with JavaScript source code, and not dealing with a string, you're not dealing with JSON. What you have there is just an object.
– T.J. Crowder
Nov 19 '18 at 18:46
1
That is not JSON, it is a JavaScript object literal. JSON is always a string.
– Amy
Nov 19 '18 at 18:46
Okay, thanks for the clarifications. I'll keep these in mind.
– Werewoof
Nov 19 '18 at 19:26