添加标签到选择 [英] Adding tags to selection

问题描述

 函数formatText（el，tag）{ 
 var selectedText = document.selection？document.selection.createRange（）。text：el.value.substring（el.selectionStart，el.selectionEnd）; // IE：Moz 
 if（selectedText == ）
 {return false} 
 var newText ='＃28'+ tag +''''+ selectedText +'＃28'+ tag +'''; 
 if（document.selection）{// IE 
 document.selection.createRange（）。text = newText; 
} 
 else {// Moz 
 el.value = el.value.substring（0，el.selectionStart）+ newText + el.value.substring（el.selectionEnd，el.value 。长度）; 
} 
} 
  

但是，我希望新标签只能看到在另一个textarea而不是我实际做选择的地方。在这种情况下，我有2个文本区域，一个称为message_text，另一个称为消息...我将输入并选择message_text中的文本，但对选择所做的任何更改只能反映在消息文本区域。

目前我已经试过这个：

 < ; button type =buttonvalue =Donclick =formatText（message，'D'）class =blue> D< / button> 
  

但是，这只有在我选择了消息文本区域中的anytnin时才有效。

谢谢

解决方案

您必须扩展javascript代码：

function formatText（el_from，el_to，tag）{
var selectedText = document.selection？ document.selection.createRange（）。text：el_from.value.substring（el_from.selectionStart，el_from.selectionEnd）; // IE：Moz

if（selectedText ==）{
返回false;
}

var start_index = el_to.value.indexOf（selectedText）;
var sel_t_len = selectedText.length;
var copy_selText = el_to.substring（start_index，sel_t_len）;

var newText ='＃28'+ tag +''''+ copy_selText +''＃28'+ tag +''';

el_to.value = el_to.value.substring（0，start_index）+ newText + el_to.value.substring（sel_t_len，el_to.value.length）;
}


然后您可以像这样调用它：

 < button type =buttonvalue =Donclick =formatText（document.getElementById（'message_text'），document.getElementById（'message' ），'D'）class =blue> D< / button> 
  

PS：我不确定 document.getElementById - 自从使用jQuery以来，多年没有使用它...你也应该转换成jQuery ...你不会为IE或FF或Chrome等解决JS问题 - jQuery自己处理这个问题。 。

编辑：好的，我做了一个小小的定制，它应该适合您的需求......

I am using this Javascript to effect the following changes in my selected text:

    function formatText(el,tag){
var selectedText = document.selection?document.selection.createRange().text:el.value.substring(el.selectionStart,el.selectionEnd);// IE:Moz
if (selectedText == "")
{return false}
var newText='"#28'+tag+'"'+selectedText+'"#28'+tag+'"';
if(document.selection){    //IE
document.selection.createRange().text=newText;
}
else{   //Moz
el.value=el.value.substring(0,el.selectionStart)+newText+el.value.substring(el.selectionEnd,el.value.length);
}
}

However, i want the new tags to only be visible in another textarea not the one where I actually do the selecting. In this case I have 2 Text areas, one is called "message_text" the other is called "message" ... I iwll input and select text in "message_text" but any changes made to the selection must only reflect in the "message" text area.

At present I have tried this:

<button type="button" value="D" onclick="formatText(message,'D')" class="blue">D</button>

But this only works if I have selected anytnin in the "message" text area.

Thanks

解决方案

You have to extend the javascript code:

function formatText(el_from, el_to, tag) {
    var selectedText = document.selection ? document.selection.createRange().text : el_from.value.substring(el_from.selectionStart, el_from.selectionEnd);// IE:Moz

    if (selectedText == "") {
        return false;
    }

    var start_index = el_to.value.indexOf(selectedText);
    var sel_t_len = selectedText.length;
    var copy_selText = el_to.substring(start_index, sel_t_len);

    var newText='"#28'+tag+'"'+copy_selText+'"#28'+tag+'"';

    el_to.value = el_to.value.substring(0, start_index) + newText + el_to.value.substring(sel_t_len, el_to.value.length);
}

Then You can call it like this:

<button type="button" value="D" onclick="formatText(document.getElementById('message_text'), document.getElementById('message'),'D')" class="blue">D</button>

PS: I'm not sure about document.getElementById - haven't used it for years since using jQuery... You should convert to jQuery, too... You would not noeed to solve JS for IE or FF or Chrome, etc - jQuery handles this by itself...

EDIT : OK, I did a little customization and it should fit to Your needs...

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