Automatically generate article abstracts [JavaScript version]

By dknt From bbs.blueidea.com

I searched this and found that I couldn’t find the answer. So I wrote one myself. Many programs bypass this problem and often manually decide where to truncate, which is too troublesome.

Implementation content: truncate a text containing HTML code, but there will be no problem of the containment tag not being closed.

A PHP version is here! : Automatically generate article summary [PHP version] .

The core part is as follows:

Copy codeThe code is as follows:

function Generate_Brief (text,length){
if(text.length < length) return text;
var Foremost = text.substr(0,length);

var re = /<(/ ?)(BODY|SCRIPT|P|DIV|H1|H2|H3|H4|H5|H6|ADDRESS|PRE|TABLE|TR|TD|TH|INPUT|SELECT|TEXTAREA|OBJECT|A|UL|OL|LI |BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT|SPAN)[^>]*(>?)/ig;

var Singlable = /BASE|META|LINK |HR|BR|PARAM|IMG|AREA|INPUT/i
var Stack = new Array(), posStack = new Array();
while(true){
var newone = re.exec( Foremost);
if(newone == null) break;

if(newone[1] == ""){
var Elem = newone[2];
if(Elem .match(Singlable) && newone[3]!= ""){
posStack.push(newone .index);

if(newone[3] == "") break;
var StackTop = Stack[Stack.length-1];
var End = newone[2].toUpperCase();
if(StackTop == End){
Stack.pop();
posStack.pop();
if (newone[3] == " "){

var cutpos = posStack.shift();
Foremost = Foremost.substring(0,cutpos);

return Foremost;
}

Test examples are as follows:

<input id="Length" type="text" size="10" style="text-align:center" value="500">
[input] truncate as <textarea name="Original" cols="100" rows="10

characters
 
No text or pictures in this article are allowed to be reproduced in any way. Violators will be prosecuted by law! ! ! Please take it seriously! 
 
<img style="max-width:90%" src="http://blogbeta.blueidea.com/UploadFiles/2006-3/330259394.jpg" style="max-width:90%" alt="Automatically generate article abstracts [JavaScript version]_javascript skills" >;

This is Doll, he is my brother. He is a cool and very cute puppy. 


 
He is two years old this year. Although he is small, his momentum is not inferior to that of a big dog. Very courageous to fight against evil forces 
 
The distinctive feature of the doll is its cuteness, especially when its ears are put behind its back, it looks particularly cute, like a well-behaved kitten. He will also stand up and dance, such as when you give him something delicious to eat. After all, this is a way of working that he relies on to make a living. These days, can you make a living if you don't know some skills? 
 
 Another characteristic of him is that he is cool. Although we are brothers, he has never flattered us humans. In the afternoon, when the bright sunshine shines in through the window, the doll will find a suitable position by itself, lie down on the floor, and let the beam of light caress him. His lying posture was so peaceful and majestic, like a holy poet, his chin gently raised and looking out the window into endless contemplation, his eyes shining with the light of a saint. When you gently walk by him, he will turn his head to look at you leisurely, with a cold and calm look, then turn his head to the original direction, and gently raise his chin again, immersed in , obsessed with...
 
He is so pitiful, as a greenhouse puppy he can only stay at home to sleep or be naughty every day. His life is so empty, so boring, so helpless. Because of his intellectual problems, he often does stupid things, and often hurts himself directly or indirectly (directly, his throat gets stuck after eating something big, indirectly, he pees everywhere and I clean him up). But can you blame him? It's not like he was as stupid as he thought. Low IQ is determined by God and cannot be controlled by him. The doll is so stupid, a pure stupid dog. After all, I failed to teach him C language programming. 

The doll is loyal and very emotional. When you are sad, he will slowly walk by you. He looks at you with that kind of caring eyes, as if he is saying in Mexican "What can I do for" you?". When you are about to leave home the night before, he will come to your bed again, you pick him up, and he will look at you with tears in his eyes, so full of affection that you will not be able to fall asleep for a long time.
 
Silly baby, he is no longer with me now. I miss him very much. 
The following is the silly doll’s expression SHOW! ! ! 
<img style="max-width:90%" src="http://blogbeta.blueidea.com/UploadFiles/2006-3/331555805.jpg" style="max-width:90%" alt="Automatically generate article abstracts [JavaScript version]_javascript skills" >

Look up at the bright moon
<img style="max-width:90%" src="http://blogbeta.blueidea.com/UploadFiles/2006-3/331408424.jpg" style="max-width:90%" alt="Automatically generate article abstracts [JavaScript version]_javascript skills" >

"Hmph, why are you bullying me, you hate me"
<img style="max-width:90%" src="http://blogbeta.blueidea.com/UploadFiles/2006-3/331372114.jpg" style="max-width:90%" alt="Automatically generate article abstracts [JavaScript version]_javascript skills" >

"Oh, it's terrible. What should I do now? I can't go down..."
<img style="max-width:90%" src="http://blogbeta.blueidea.com/UploadFiles/2006-3/331390749.jpg" style="max-width:90%" alt="Automatically generate article abstracts [JavaScript version]_javascript skills" >

"Oh, I'm so sad, there's really nothing I can do."
<img style="max-width:90%" src="http://blogbeta.blueidea.com/UploadFiles/2006-3/331110392.jpg" style="max-width:90%" alt="Automatically generate article abstracts [JavaScript version]_javascript skills" >

"Wow, I'm so pitiful, please let me go, I'm going to cry, so sad..."
<img style="max-width:90%" src="http://blogbeta.blueidea.com/UploadFiles/2006-3/331360619.jpg" style="max-width:90%" alt="Automatically generate article abstracts [JavaScript version]_javascript skills" >

"Hey! What's wrong with you! I didn't listen to what I was talking to you!"
<img style="max-width:90%" src="http://blogbeta.blueidea.com/UploadFiles/2006-3/331211562.jpg" style="max-width:90%" alt="Automatically generate article abstracts [JavaScript version]_javascript skills" >

"Oh, you little guy, you are tired of living!"
<img style="max-width:90%" src="http://blogbeta.blueidea.com/UploadFiles/2006-3/331367925.jpg" style="max-width:90%" alt="Automatically generate article abstracts [JavaScript version]_javascript skills" >

"Hey! I am a ferocious big tiger!"

[briefing] <textarea id="Brief" cols="100" rows="10">

[Ctrl A select all Note:

If you need to introduce external Js, you need to refresh to execute ]<script> function Do(){ var sOriginal = HtmlDecode(document.getElementById("Original").innerHTML); var iLength = parseInt(document.getElementById("Length").value); if(isNaN(iLength) || iLength<=0){ alert("Length Error"); } var sBrief = Generate_Brief(sOriginal,iLength); document.getElementById("Brief").innerHTML = htmlEncode(sBrief); }; function Generate_Brief(text,length){ if(text.length < length) return text; var Foremost = text.substr(0,length); var re = /<(\/?)(BODY|SCRIPT|P|DIV|H1|H2|H3|H4|H5|H6|ADDRESS|PRE|TABLE|TR|TD|TH|INPUT|SELECT|TEXTAREA|OBJECT|A|UL|OL|LI|BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT|SPAN)[^>]*(>?)/ig; var Singlable = /BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT/i var Stack = new Array(), posStack = new Array(); while(true){ var newone = re.exec(Foremost); if(newone == null) break; if(newone[1] == ""){ var Elem = newone[2]; if(Elem.match(Singlable) && newone[3]!= ""){ continue; } Stack.push(newone[2].toUpperCase()); posStack.push(newone.index); if(newone[3] == "") break; }else{ var StackTop = Stack[Stack.length-1]; var End = newone[2].toUpperCase(); if(StackTop == End){ Stack.pop(); posStack.pop(); if(newone[3] == ""){ Foremost = Foremost+">"; } } }; } var cutpos = posStack.shift(); Foremost = Foremost.substring(0,cutpos); return Foremost; } </script>
This test case should work. If not, please open this page under pure IE.

The main problem is that the article cannot exceed 20,000 words, and HTMLencode and HTMLdecode are still missing. I have no choice but to embed it.

HTMLencode, HTMLdecode are defined in http://cs02.100steps.net/new/onejsneeded.js. I didn't write it, so go get it yourself if you need it.
My space speed may be slower for everyone, so there is nothing I can do...