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Android check null or empty string


Yo can check it with this:

if(userEmail != null &&
!userEmail .isEmpty())

And remember you must use from exact above code with that order. Because that ensuring you will not get a null pointer exception from userEmail.isEmpty() if userEmail is null.

Above description, it's only available since Java SE 1.6. Check userEmail.length() == 0 on previous versions.


Categories : Android

Related to : Android check null or empty string
Check if any element with a certain class is empty
You need to check whether there is some content then check, also your selector has a problem it should be .field-validation-valid.text-danger if (!$(".field-validation-valid.text-danger").html().trim().length) { // do work } The empty-selector will fail if the checking element has a [space] as its content like <span> </span>

Categories : Javascript
ExtJs - best way to check if Ext.Array is empty?
You can easily add this to the Array prototype like this: Array.prototype.isEmpty = function(){ return !this.length; }; var a = ['a','b','c','d']; var b = ['b','d','f','h']; var c = Ext.Array.difference(a,b); var d = []; console.log(c.isEmpty(), d.isEmpty()); Hope it helps :)

Categories : Javascript
Create class to check if textbox is empty etc
instead of Class MyTextBox Inherited From TextBox and Use this to refer CurrentTextBox Use this MyTextBox in Your Code where ever you want class MyTextBox : TextBox { public bool IsMyTextBoxEmpty() { if (!string.IsNullOrEmpty(this.Text.Trim())) { return true; } return false; } public bool IsCont

Categories : C#
Parse.com: How to properly check if a field is empty?
You would use whereKeyExists: Checkout the Parse documentation If you want to retrieve objects that have a particular key set, you can use whereKeyExists. Conversely, if you want to retrieve objects without a particular key set, you can use whereKeyDoesNotExist. // Finds objects that have the score set [query whereKeyExists:@"score"];

Categories : IOS
regular expression in java to check that a string is part of another string (NO SUBSTRING)
Not a direct regex, but given the search string it is easy enough to build one: String main = "complete"; String search = "come"; char[] split = search.toCharArray(); StringBuilder regex = new StringBuilder(".*"); for (int i =0; i < split.length; i++) { regex.append(split[i]).append(".*"); } System.out.println(main.matches(regex.toString())); In this ex

Categories : Java
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