如何检查AngularJS中是否存在具有ID的元素

Question

How can I check if an element with a specific ID already exists in my DOM inside an Angular directive? By using angular.element() an element is created if one does not exist, for example angular.element('someID') will return an element whether one already exist or not.

What I am doing now as a workaround is using the .html() jqLite function like this:

if(angular.element('#someElementID'). html() ) {

console.log('only fires if element already exists');

}

Is there a better way to do this? I would like to avoid including the whole jQuery just for this.

Answer 1

Both angular.element($document).find('#someElementID') and angular.element('#someElementID') return an empty array, in case several dom nodes matched the selector.

You should be pretty safe doing the following:

if ( angular.element('#someElementID').length ) {
    console.log('#someElementID exists');
}

Also keep in mind that jQLite .find() method only supports tag names.

Answer 2

I have tested, its working fine..

If the ID is Exists, it return 1

ID is not Exists, it return 0

if(angular.element('#someElementID').length >0){
 console.log("Id is available.");
}else{
  console.log("Id is not available.");
}