How to filter and remove duplicate JSON List?
I have a local JSON file as shown below and I load it into my flutter project using "await rootBundle.loadString(****)". I decoded to map as "Map _mapCompany = jsonDecode(jsonComapany)" than later assign map to list as "_tmpCompany = _mapComapany["companyBranch"];"
Now I need to use filter to get [companyName] and also I need to remove duplicate [companyName] and load to dropdown button.
I use var "_result = new Collection(_tmpCompany).distinct()" to remove duplicate but how can I assign _result.toList() to List _comapnyName; or to dropdown button?
Once the first dropdown loads I use on change event to load branch list using filter. How can I do that?
{
“companyBranch”:[
{
"companyCode":"1",
"companyName”:”COMAPANY A”,
"branchCode”:”855”,
"branchName”:”BRANCH A1”
},
{
"companyCode":"1",
"companyName”:”COMPANY A”,
"branchCode":"856",
"branchName”:”BRANCH A2“
},
{
"companyCode":"10",
"companyName”:”COMAPNY B”,
"branchCode":"860",
"branchName”:”BRANCH B1”
},
{
"companyCode":"10",
"companyName”:”COMPANY B”,
"branchCode":"861",
"branchName”:”BRANCH B2”
},
list filter dart
flutter dropdown asked Nov 22 '18 at 14:33
NickNick
33712
add a comment |
I have a local JSON file as shown below and I load it into my flutter project using "await rootBundle.loadString(****)". I decoded to map as "Map _mapCompany = jsonDecode(jsonComapany)" than later assign map to list as "_tmpCompany = _mapComapany["companyBranch"];"
Now I need to use filter to get [companyName] and also I need to remove duplicate [companyName] and load to dropdown button.
I use var "_result = new Collection(_tmpCompany).distinct()" to remove duplicate but how can I assign _result.toList() to List _comapnyName; or to dropdown button?
Once the first dropdown loads I use on change event to load branch list using filter. How can I do that?
{
“companyBranch”:[
{
"companyCode":"1",
"companyName”:”COMAPANY A”,
"branchCode”:”855”,
"branchName”:”BRANCH A1”
},
{
"companyCode":"1",
"companyName”:”COMPANY A”,
"branchCode":"856",
"branchName”:”BRANCH A2“
},
{
"companyCode":"10",
"companyName”:”COMAPNY B”,
"branchCode":"860",
"branchName”:”BRANCH B1”
},
{
"companyCode":"10",
"companyName”:”COMPANY B”,
"branchCode":"861",
"branchName”:”BRANCH B2”
},
list filter dart
flutter dropdown asked Nov 22 '18 at 14:33
NickNick
33712
add a comment |
I have a local JSON file as shown below and I load it into my flutter project using "await rootBundle.loadString(****)". I decoded to map as "Map _mapCompany = jsonDecode(jsonComapany)" than later assign map to list as "_tmpCompany = _mapComapany["companyBranch"];"
Now I need to use filter to get [companyName] and also I need to remove duplicate [companyName] and load to dropdown button.
I use var "_result = new Collection(_tmpCompany).distinct()" to remove duplicate but how can I assign _result.toList() to List _comapnyName; or to dropdown button?
Once the first dropdown loads I use on change event to load branch list using filter. How can I do that?
{
“companyBranch”:[
{
"companyCode":"1",
"companyName”:”COMAPANY A”,
"branchCode”:”855”,
"branchName”:”BRANCH A1”
},
{
"companyCode":"1",
"companyName”:”COMPANY A”,
"branchCode":"856",
"branchName”:”BRANCH A2“
},
{
"companyCode":"10",
"companyName”:”COMAPNY B”,
"branchCode":"860",
"branchName”:”BRANCH B1”
},
{
"companyCode":"10",
"companyName”:”COMPANY B”,
"branchCode":"861",
"branchName”:”BRANCH B2”
},
list filter dart
flutter dropdown asked Nov 22 '18 at 14:33
NickNick
33712
I have a local JSON file as shown below and I load it into my flutter project using "await rootBundle.loadString(****)". I decoded to map as "Map _mapCompany = jsonDecode(jsonComapany)" than later assign map to list as "_tmpCompany = _mapComapany["companyBranch"];"
Now I need to use filter to get [companyName] and also I need to remove duplicate [companyName] and load to dropdown button.
I use var "_result = new Collection(_tmpCompany).distinct()" to remove duplicate but how can I assign _result.toList() to List _comapnyName; or to dropdown button?
Once the first dropdown loads I use on change event to load branch list using filter. How can I do that?
{
“companyBranch”:[
{
"companyCode":"1",
"companyName”:”COMAPANY A”,
"branchCode”:”855”,
"branchName”:”BRANCH A1”
},
{
"companyCode":"1",
"companyName”:”COMPANY A”,
"branchCode":"856",
"branchName”:”BRANCH A2“
},
{
"companyCode":"10",
"companyName”:”COMAPNY B”,
"branchCode":"860",
"branchName”:”BRANCH B1”
},
{
"companyCode":"10",
"companyName”:”COMPANY B”,
"branchCode":"861",
"branchName”:”BRANCH B2”
},
list filter dart
flutter dropdown list filter dart
flutter dropdown asked Nov 22 '18 at 14:33
NickNick
33712
asked Nov 22 '18 at 14:33
NickNick
33712
asked Nov 22 '18 at 14:33
NickNick
33712
asked Nov 22 '18 at 14:33
NickNick
33712
asked Nov 22 '18 at 14:33
NickNick
33712
33712
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
This should do what you want
var uniqueCompanyNames = _tmpCompany.map<String>(
(c) => (c as List)['companyName'] as String)
.toSet().toList()
answered Nov 22 '18 at 14:35
Günter ZöchbauerGünter Zöchbauer
321k68957892
how to assign uniqueCompanyNames to dropdown I am getting error
– Nick
Nov 22 '18 at 14:51
What's the error? Please add the code to your question that causes this error.
– Günter Zöchbauer
Nov 22 '18 at 14:54
2
thanks, I forget to add .toList(), end of it...
– Nick
Nov 22 '18 at 14:57
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53433186%2fhow-to-filter-and-remove-duplicate-json-list%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This should do what you want
var uniqueCompanyNames = _tmpCompany.map<String>(
(c) => (c as List)['companyName'] as String)
.toSet().toList()
answered Nov 22 '18 at 14:35
Günter ZöchbauerGünter Zöchbauer
321k68957892
how to assign uniqueCompanyNames to dropdown I am getting error
– Nick
Nov 22 '18 at 14:51
What's the error? Please add the code to your question that causes this error.
– Günter Zöchbauer
Nov 22 '18 at 14:54
2
thanks, I forget to add .toList(), end of it...
– Nick
Nov 22 '18 at 14:57
add a comment |
This should do what you want
var uniqueCompanyNames = _tmpCompany.map<String>(
(c) => (c as List)['companyName'] as String)
.toSet().toList()
answered Nov 22 '18 at 14:35
Günter ZöchbauerGünter Zöchbauer
321k68957892
how to assign uniqueCompanyNames to dropdown I am getting error
– Nick
Nov 22 '18 at 14:51
What's the error? Please add the code to your question that causes this error.
– Günter Zöchbauer
Nov 22 '18 at 14:54
2
thanks, I forget to add .toList(), end of it...
– Nick
Nov 22 '18 at 14:57
add a comment |
This should do what you want
var uniqueCompanyNames = _tmpCompany.map<String>(
(c) => (c as List)['companyName'] as String)
.toSet().toList()
answered Nov 22 '18 at 14:35
Günter ZöchbauerGünter Zöchbauer
321k68957892
This should do what you want
var uniqueCompanyNames = _tmpCompany.map<String>(
(c) => (c as List)['companyName'] as String)
.toSet().toList()
answered Nov 22 '18 at 14:35
Günter ZöchbauerGünter Zöchbauer
321k68957892
answered Nov 22 '18 at 14:35
Günter ZöchbauerGünter Zöchbauer
321k68957892
answered Nov 22 '18 at 14:35
Günter ZöchbauerGünter Zöchbauer
321k68957892
answered Nov 22 '18 at 14:35
Günter ZöchbauerGünter Zöchbauer
321k68957892
321k68957892
how to assign uniqueCompanyNames to dropdown I am getting error
– Nick
Nov 22 '18 at 14:51
What's the error? Please add the code to your question that causes this error.
– Günter Zöchbauer
Nov 22 '18 at 14:54
2
thanks, I forget to add .toList(), end of it...
– Nick
Nov 22 '18 at 14:57
add a comment |
how to assign uniqueCompanyNames to dropdown I am getting error
– Nick
Nov 22 '18 at 14:51
What's the error? Please add the code to your question that causes this error.
– Günter Zöchbauer
Nov 22 '18 at 14:54
2
thanks, I forget to add .toList(), end of it...
– Nick
Nov 22 '18 at 14:57
how to assign uniqueCompanyNames to dropdown I am getting error
– Nick
Nov 22 '18 at 14:51
how to assign uniqueCompanyNames to dropdown I am getting error
– Nick
Nov 22 '18 at 14:51
What's the error? Please add the code to your question that causes this error.
– Günter Zöchbauer
Nov 22 '18 at 14:54
What's the error? Please add the code to your question that causes this error.
– Günter Zöchbauer
Nov 22 '18 at 14:54
2
2
thanks, I forget to add .toList(), end of it...
– Nick
Nov 22 '18 at 14:57
thanks, I forget to add .toList(), end of it...
– Nick
Nov 22 '18 at 14:57
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53433186%2fhow-to-filter-and-remove-duplicate-json-list%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
