ASP.NET jQuery Example 13 Original jQuery text box character limit plug-in-TextArea Counter

ASP.NET jQuery Example 13 Original jQuery text box character limit plug-in-TextArea Counter_jquery

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Release： 2016-05-16 17:56:32

Original

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•Can limit the maximum input character length
•Can set the character interception speed
•Customizable prompt information text style (customized text content can be improved)
This plug-in counts that the length of English characters and Chinese characters are the same .
Without further ado, here is the detailed plug-in code. The specific implementation details are already commented in the code:

Copy code The code is as follows:

; (function ($) { 
$.fn.extend({ 
textAreaCount: function (options) { 
var $textArea = this; 
options = $.extend({ 
maxlength: 140, // Define a maximum input length variable, initialized to 500 
speed: 15, // Define the speed variable for deleting characters 
msgstyle: "font -family:Arial;font-size:small;color:Gray;small;text-align:right;margin-top:3px;", // Prompt information display style
msgNumStyle: "font-weight:bold;color :Gray;font-style:italic;font-size:larger;" // The remaining length style in the prompt message 
}, options); 
var $msg = $("
"); 
// Dynamically load a prompt information container behind the text box 
$textArea.after($msg); 
// Add keypress event Used to determine whether the current content can still be input 
$textArea.keypress(function (e) { 
// 8 is the Backspace button, 46 is the Delete button 
// If the current input character length is 0 , and the key value is not 8 and 46, no operation will be performed
if ($textArea.val().length >= options.maxlength && e.which != '8' && e.which != '46 ') { 
e.preventDefault(); 
return; 
} 
}).keyup(function () { // Add keyup event to calculate the remaining input words and display 
var curlength = this.value.length; 
$msg.html("").html("You can also enter " (options.maxlength - curlength) "< ;/span>Word"); 
var init = setInterval(function () { 
// If the input content is greater than the set maximum length, the content will be automatically intercepted at the set speed 
if ($textArea. val().length > options.maxlength) { 
$textArea.val($textArea.val().substring(0, options.maxlength)); 
$msg.html("").html ("You can also enter" options.maxlength "words"); 
} 
else { 
clearInterval(init); 
} 
}, options.speed); 
}).bind("contextmenu", function (e) { // Disable the right mouse button to prevent text manipulation through the mouse
return false; 
}); 
// When loading for the first time, you can now enter the character length prompt information 
$msg.html("").html("You can also enter  " options.maxlength "Word"); 
return this; 
} 
}); 
})(jQuery); 

directly Copy and save the above code to jquery.textareacounter.js.
Demo:
Now let’s take a look at how to use the plug-in. First, we must reference the plug-in. The code is as follows:

Copy code The code is as follows:

Page structure Code:

Copy code The code is as follows:

Call the plug-in to implement the character limit function of the text box control txtCmt, script code:

Copy code The code is as follows:

Note: To use this plug-in, just call the textAreaCount() method. You can set the options parameters of this method.
Options parameter description:
maxlength: Set the maximum number of input characters
speed: Set interception The speed of characters
msgstyle: Set the style of the text prompt message theme
msgNumStyle: Set the style of the remaining number of characters in the text prompt message
The final rendering after using this plug-in: