I'm trying to build an Angular Tag Directive that functions not too dissimilarity from Stack Overflow's Tag input form. It uses a div with a border to create the illusion of a form, and then a div containing a list of tags to the left of an input field where you can type:
<div class="wrapper">
<div class="tag-wrapper">
<div class="tags" ng-repeat="tag in selectedTags">
<div>
[[ tag.name ]]
<span class="remove" ng-click="removeTag(tag)"></span>
</div>
</div>
</div>
<input type="text" class="tag-input"
ng-model="tagInput"
ng-style="{ width: inputLength + 'px'}"
ng-keypress="tagInputKeyPress($event)"
ng-keyup="updateSuggestionList()"
ng-focus="toggleSuggestionVisibility()"
ng-blur="toggleSuggestionVisibility()" />
</div>
Please note I'm using [[]]
as my interpolation provider for Angular because I have another templating engine already using {{}}
.
When a key is pressed in the input, it runs a function to check if the key is a backspace or enter or a space to create/remove a tag:
$scope.tagInputKeyPress = function(event) {
// Currently using jQuery.event.which to detect keypresses, keyCode is deprecated, use KeyboardEvent.key eventually:
// https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key
// event.key == ' ' || event.key == 'Enter'
if (event.which == 32 || event.which == 13) {
event.preventDefault();
// Remove any rulebreaking chars
var tag = $scope.tagInput;
tag = tag.replace(/["']/g, "");
// Remove whitespace if present
tag = tag.trim();
$scope.createTag(tag);
// event.key == 'Backspace'
} else if (event.which == 8 && $scope.tagInput == "") {
event.preventDefault();
// grab the last tag to be inserted (if any) and put it back in the input
if ($scope.selectedTags.length > 0) {
$scope.tagInput = $scope.selectedTags.pop().name;
}
}
$scope.inputLength = $(element).find('input.tag-input').parent().innerWidth() - $(element).find('.tag-wrapper').outerWidth() - 1;
return true;
};
The bit I'm having problems with is the last line before the return statement. What it is meant to do is recompute the width of the .tag-wrapper
element and adjust the width of the input
element to suit via this ng-style
property:
ng-style="{ width: inputLength + 'px'}"
However, as it currently stands, the input length is always one step behind the UI, causing the input to overflow. This is because:
- It firstly adds a new tag onto the
selectedTags
list. - It computes the width of
.tag-wrapper
. - It returns true letting the original key event pass through
- Angular's digest cycle runs and appends a new tag into the DOM. The width of
.tag-wrapper
is now bigger, and theinput
overflows.
Here is an example of this:
Right now, step 4 is happening after step 2. I need step 2 to happen after step 4.
How can I achieve this?