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2013-09-30T16:24:57.023
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2013-09-30T16:24:57.023
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I have created a placeholder directive that can take angularjs expressions and also hides the placeholder text on input. You can read about the placeholder at <a href="http://blog.f1circle.com/2013/09/supporting-placeholders-in-non-html5.html" rel="nofollow">http://blog.f1circle.com/2013/09/supporting-placeholders-in-non-html5.html</a> Here is the gist. <pre><code>(function(angular, app) { "use strict"; app.directive('placeholder',["$document", "$timeout", function($document, $timeout){ var link = function(scope,element,attrs,ctrl){ // if you dont use modernizr library use the solution given at // http://stackoverflow.com/questions/5536236/javascript-check-for-native-placeholder-support-in-ie8 // to check if placeholder is supported natively if(Modernizr.input.placeholder){ return; } /* The following keys all cause the caret to jump to the end of the input value 27, Escape 33, Page up 34, Page down 35, End 36, Home Arrow keys allow you to move the caret manually, which should be prevented when the placeholder is visible 37, Left 38, Up 39, Right 40, Down The following keys allow you to modify the placeholder text by removing characters, which should be prevented when the placeholder is visible 8, Backspace 46 Delete */ var pTxt, modelValue, placeholding = false, badKeys = [27,33,34,35,36,37,38,39,40,8,46]; var unplacehold = function(){ if(!placeholding){ return; } placeholding = false; element.removeClass('placeholder'); element.val(''); }; var placehold = function(){ if(placeholding || modelValue){ return; } placeholding = true; element.addClass('placeholder'); element.val(pTxt); }; var moveCaret = function(elem, index) { var range; if (elem.createTextRange) { range = elem.createTextRange(); range.move("character", index); range.select(); } else if (elem.selectionStart) { elem.focus(); elem.setSelectionRange(index, index); } }; attrs.$observe('placeholder',function(value){ pTxt = value; placeholding = false; placehold(); }); ctrl.$parsers.unshift(function (value){ modelValue = value; if(!value){ placehold(); } if(placeholding){ return ''; } return value; }); ctrl.$formatters.unshift(function (value){ if(!value){ placehold(); modelValue = ''; return pTxt; } return value; }); element.on('click focus contextmenu',function(event){ if($document[0].activeElement !== this){ return; } if(!modelValue){ moveCaret(this,0); } }); element.on('blur',function(){ placehold(); }); element.on('keydown',function(e){ if(!placeholding){ return; } if(_.contains(badKeys,e.keyCode)){ if(e.preventDefault){ e.preventDefault(); } return false; } unplacehold(); }); element.on('keyup',function(e){ if(modelValue){ return; } placehold(); moveCaret(this,0); }); element.on('paste',function(e){ $timeout(function(){ modelValue = element.val(); },0); }); }; return{ restrict: 'A', require: 'ngModel', link : link, priority:3, }; }]); })(angular, app); </code></pre> This works on all cases except when copy and paste the same placeholder text.
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1. POAngularjs input[placeholder] directive breaking with ng-model
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1. USAnirudhan J
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