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Javascript controls insert text at the cursor position for insert of expressions

Source: Internet
Author: User
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Directly add the code and use js to control the insert at the cursor position.

Used to insert an emoticon.
Copy codeThe Code is as follows:
<Span style = "font-size: 18px;"> <Head>
<Script type = 'text/javascript '>
Function test (str ){
Var tc = document. getElementById ("mytextarea ");
Var tclen = tc. value. length;
Tc. focus ();
If (typeof document. selection! = "Undefined ")
{
Document. selection. createRange (). text = str;
}
Else
{
Tc. value = tc. value. substr (0, tc. selectionStart) + str + tc. value. substring (tc. selectionStart, tclen );
}
}
</Script>
</Head>
<Body>
<Textarea rows = 5 name = s1 cols = 27 id = "mytextarea"> Objective To insert text at the cursor position in textarea by clicking the button on the page </textarea>
<Input type = button onclick = "test ('this is the text to be added ')"/>
</Body>
</Html>
</Span>

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