Parser Error: Got interpolation ({{}}) where expression was expected

问题

I'm using ng-bootstrap as a substitute for ui-bootstrap in angular2.

My html is as follows:

<ul class="list-inline">
    <li class="tag" ngb-dropdown auto-close="outsideClick" 
        *ngFor="let item of ['Elastic Search','Database Theory','CVS'];
        let $index=index;" 
        [ngClass]="{'default-tag': $index==0, 'matched-tag': $index==1, 'unmatched-tag': $index==2 }">
         <a href ngb-dropdown-toggle id="desiredSkill{{$index}}">
             <i class="bi_interface-tick following"></i> {{item}} <i class="bi_interface-more tag-menu-icon"></i>
                            </a>
               <ul class="dropdown-menu tag-menu" ngb-dropdown-menu [aria-labelledby]="desiredSkill{{$index}}">
                     <li><a href>Follow Skill</a></li>
                     <li><a href>Related Jobs</a></li>
                </ul>
     </li>
  </ul>

But when I run my app I get following error:

main.browser.ts:25Error: Template parse errors: Parser Error: Got interpolation ({{}}) where expression was expected at column 12 in [desiredSkill{{$index}}] in JobDescription@174:77 (" ][aria-labelledby]="desiredSkill{{$index}}">
"): JobDescription@174:77 Parser Error: Unexpected token '{' at column 13 in [desiredSkill{{$index}}] in JobDescription@174:77 ("
][aria-labelledby]="desiredSkill{{$index}}">
"): JobDescription@174:77 Can't bind to 'aria-labelledby' since it isn't a known property of 'ul'. (" ][aria-labelledby]="desiredSkill{{$index}}">
"): JobDescription@174:77 Parser Error: Got interpolation ({{}}) where expression was expected at column 12 in [desiredSkill{{$index}}] in JobDescription@174:77 ("
                <div class="row">
                  <div class="col-lg-4 col-xs-4" [ERROR ->]*ngFor="let i of [0,1,3]">
                    <img src="http://ecx.images-amazon.com/images/I/81VFU9"):
JobDescription@215:49 Parser Error: Unexpected token '{' at column 13 in [desiredSkill{{$index}}] in JobDescription@174:77 ("
                <div class="row">
                  <div class="col-lg-4 col-xs-4" [ERROR ->]*ngFor="let i of [0,1,3]">
                    <img src="http://ecx.images-amazon.com/images/I/81VFU9"):
JobDescription@215:49 Parser Error: Got interpolation ({{}}) where expression was expected at column 12 in [desiredSkill{{$index}}] in JobDescription@174:77 (" ERROR ->="main.applyJob()">Apply for job ERROR ->="main.applyJob()">Apply for job ][hidden]="!ifNotApplied">Applied ][hidden]="!ifNotApplied">Applied ][hidden]="!ifNotUploaded">Upload CV ][hidden]="!ifNotUploaded">Upload CV Have questions about this job?
[ERROR ->] Have questions about this job? [ERROR ->]

回答1:

You can't use interpolation inside standart property binding. There should be expression.

Seems it should be:

[attr.aria-labelledby]="'desiredSkill' + $index"

attr.aria-labelledby="desiredSkill{{$index}}"

回答2:

Usually this error occurs when we are trying to implement both Interpolation and Property data binding on the same html property.

Example:

Wrong implementation

[disabled]= {{isDisabled}}

Correct implementation

disabled= {{isDisabled}}

Note: remove the square bracket from the html element property

回答3:

I think you forgot to declare index of ngFor

*ngFor="let item of ['Elastic Search','Database Theory','CVS'];let $index=index" ...

also use,

[attr.aria-labelledby]="desiredSkill{{$index}}"

回答4:

Use this

  <button class="btn btn-primary" title="Edit" (click)="showEditModal(record.id)"><i class="fa fa-edit"></i></button>

回答5:

In link tags use like this

Use this

<a  class="custom-badge status-blue" [routerLink]="'/hospital/doctorleave/'+item.Id]">Manage Leave</a>

Instead of

<a  class="custom-badge status-blue" [routerLink]="'/hospital/doctorleave/{{item.Id}}']">Manage Leave</a>

回答6:

If you want pass only $index value

[attr.aria-labelledby]=" ' ' + $index"

来源：https://stackoverflow.com/questions/40203279/parser-error-got-interpolation-where-expression-was-expected

标签

angular

angular-ui-bootstrap

dropdown