[英]increase the size of textArea programmatically
I am able to increase the size of textarea according to Number of lines, but supose I did not press enter and simply enter text then it does not work and size of textarea does not work. 我可以根据行数来增加textarea的大小,但是我没有按Enter键,只是输入了文本,所以它不起作用,textarea的大小也不起作用。 See the following fiddle.
请参阅以下小提琴。
$("textarea").on("keyup", function($event) { this.rows = (this.value.split("\\n").length||1); var thisTextArea = $event.currentTarget; if (thisTextArea.value.split("\\n").length > 5) { thisTextArea.rows = (thisTextArea.value.split("\\n").length); $(thisTextArea).css("overflow-y","hidden"); if (thisTextArea.rows > 15) { $(thisTextArea).css("overflow-y","scroll"); } } else { thisTextArea.rows = 6; $(thisTextArea).css("overflow-y","hidden"); } });
<textarea rows="5"></textarea>
$(document)
.one('focus.textarea', '.autoExpand', function(){
var savedValue = this.value;
this.value = '';
this.baseScrollHeight = this.scrollHeight;
this.value = savedValue;
})
.on('input.textarea', '.autoExpand', function(){
var minRows = this.getAttribute('data-min-rows')|0,
rows;
this.rows = minRows;
rows = Math.ceil((this.scrollHeight - this.baseScrollHeight) / 16);
this.rows = minRows + rows;
});
html HTML
<textarea rows="5"class='autoExpand'></textarea>
css CSS
textarea{
display:block;
box-sizing: padding-box;
overflow:hidden;
padding:10px;
width:250px;
font-size:14px;
margin:50px auto;
border-radius:8px;
border:6px solid #556677;
}
Finalaly I have done this way. 最后,我这样做了。 See following Link.
请参阅以下链接。
$("textarea").on("keyup",function($event) {
var textarea = $event.currentTarget;
if (textarea.scrollHeight > 305) {
textarea.style.height = "1px";
textarea.style.height = (3+textarea.scrollHeight)+"px";
$(textarea).css("overflow-y","scroll");
}
else if (textarea.scrollHeight > 105){
$(textarea).css("overflow-y","hidden");
textarea.style.height = "1px";
textarea.style.height = (3+textarea.scrollHeight)+"px";
}
});
$("textarea").on("focus",function($event) {
var textarea = $event.currentTarget;
if (textarea.scrollHeight > 105) {
//textarea.style.height = textarea.scrollHeight;
$(textarea).css("height",textarea.scrollHeight);
if(textarea.scrollHeight > 305) {
$(textarea).css("overflow-y","scroll");
}
}
$( "textarea" ).unbind("focus");
});
https://jsfiddle.net/xwkw3a2r/1/ https://jsfiddle.net/xwkw3a2r/1/
https://github.com/mbklein/jquery-elastic/blob/master/index.html https://github.com/mbklein/jquery-elastic/blob/master/index.html
$(document).ready(function() { $('textarea').elastic(); });
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Demo - Elastic</title> <meta http-equiv="Content-Type" content="application/xhtml+xml; charset=utf-8" /> <link href="https://raw.githubusercontent.com/mbklein/jquery-elastic/master/dependencies/screen.css" type="text/css" rel="stylesheet" /> </head> <body> <div class="form"> <p> <label>Fill the textarea to make it grow</label> <span class="w"> <textarea class="input">This textarea is going to grow when you fill it with text. Just type a few more words in it and you will see.</textarea> </span> </p> </div> <script src="https://raw.githubusercontent.com/mbklein/jquery-elastic/master/jquery.elastic.js" type="text/javascript"></script> <script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> </body> </html>
Update html 更新HTML
<textarea rows="5" cols="15"></textarea>
Use this js snippet 使用此js代码段
$("textarea").on("keyup", function($event) {
var textarea = $(this);
var text = textarea.val();
var lines = text.split(/\r*\n/);
var cols = textarea.attr('cols');
var TOTAL_LINES = 0;
for (var i = 0; i < lines.length; i++) {
TOTAL_LINES += Math.ceil(lines[i].length/cols);
}
console.log(TOTAL_LINES);
if (TOTAL_LINES > 5) {
textarea.attr('rows', TOTAL_LINES);
textarea.css("overflow-y","hidden");
if (TOTAL_LINES > 15) {
textarea.css("overflow-y","scroll");
}
} else {
textarea.attr('rows', 6);
textarea.css("overflow-y","hidden");
}
});
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