扳机<input type="file">以编程方式选择带有角度的文件

Question

Im using ngImgCrop as can be seen in this JSFiddle .
What I try to achieve is that the image selection box will open automatically when i show(using ng-if) the:

<div ng-if="showImageSelector">
 <div>Select an image file: <input type="file" id="fileInput" /></div>
 <div class="cropArea">
  <img-crop image="myImage" result-image="myCroppedImage"></img-crop>
 </div>
</div>

that is: i want to programatically open the image selection window, without even showing the user the:

<input type="file" id="fileInput" />

Iv'e tried put in the controller several variations of click event of the input, but none of them worked, so far iv'e tried: 1.

$timeout(function() {
    angular.element('#fileInput').triggerHandler('click');
  }, 0);

2.

angular.element(document).ready(function () {
    angular.element('#fileInput').triggerHandler('click');
  });

3.

setTimeout(function(){
    angular.element('#fileInput').triggerHandler('click');
  }, 1000);

4.

setTimeout(function(){
    document.getElementById('fileInput').click();
  }, 1000);

Answer 1

For trigger the file selector open programmatically, the answer is yes.

But you need to make sure this event was fired by THE USER.

For example, you have a button there, you attach the click event on it. After the user click this button , inside the event handler, you can trigger by javascript code eg, document.getElementById('fileInput').click() . This should work.

However, if you want to simply run several lines of javascript code to open a file selector without user's click , that's not possible, because that violate the security policy.

So I added some code to your sample ,

html,

<button ng-click='open()'>Open selector</button>

javascript,

$scope.open = function() {
     document.getElementById('fileInput').click(); //this work
};

Hope this would solve your problem. : )

Answer 2

Ended up wrapping the ngImgCrop with my directive, in it iv'e placed that:

$timeout(function () {
      angular.element(document.querySelector('#fileInput')).click();
      $log.debug("poped it");
    }, 250);

in the link function. Aside the real element i show for the img selector, iv'e placed this at my index.html:

<div ng-show="false">
  <my-image-select cropped-image="groupDetails.newPic" return-func="groupDetails.imageSelectFinish"></my-image-select>
</div>

and it works. without the extra invisible my-image-select in index.html, the file chooser only auto open from the second attempt.