How jQuery limits the number of characters in textarea

This article mainly introduces how jQuery limits the number of characters in textarea. It is very detailed and has a certain reference value. Friends who are interested must finish it!

Limit the number of characters in textarea

JQuery.fn.maxLength = function (max) {this.each (function () {var type = this.tagName.toLowerCase (); var inputType = this.type? This.type.toLowerCase (): null;if (type = = "input" & & inputType = = "text" | | inputType = = "password") {/ / Apply the standard maxLengththis.maxLength = max;} else if (type = = "textarea") {this.onkeypress = function (e) {var ob = e | event;var keyCode = ob.keyCode;var hasSelection = document.selection? Document.selection.createRange (). Text.length > 0: this.selectionStart! = this.selectionEnd;return! (this.value.length > = max & & (keyCode > 50 | keyCode = = 32 | | keyCode = = 0 | | keyCode = = 13) & &! ob.ctrlKey & &! ob.altKey &! hasSelection);}; this.onkeyup = function () {if (this.value.length > max) {this.value = this.value.substring;};});} / / Usage:$ ('# gbin1textarea'). MaxLength (500); the above is all the content of the article "how to limit the number of characters in textarea by jQuery". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!