JS upload image and preview function

Source: Internet
Author: User

JS upload image and preview function

This article describes the JS upload image and preview function. Share to everyone for your reference. The specific analysis is as follows:

Refer to some people on the web code to write a upload image in time to preview the function

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22-23 <input type=" file "/> function displayimage (filetag,imgtag Id) {var allowextention= ". Jpg.png.gif"; var extentionarr=filetag.value.split ('. '); var extention = extentionarr[ EXTENTIONARR.LENGTH-1]; if (!) ( Allowextention.indexof (extention) >-1)) {alert ("please upload image!");} else{//for adveced Broswer (the newest ie,chrome,ff) if (typeof (FileReader)!== "undefined") {var reader = new FileReader (); Reader.readasdataurl (Filetag.files[0]); Reader.onload = function (e) {document.getElementById (Imgtagid). setattribute ("src", E.target.result);} else{//for (IE6) document.getElementById (imgtagid). setattribute ("src", filetag.value);} }

I hope this article will help you with your JavaScript programming.

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