Using Variables in Replace() Method - Javascript

Question

I am trying to replace the contents of the alt="" attribute in the tag.

The replacment text comes from textarea input that is assigned to var alttext

The var oldtext contains tags with placeholders for replacing, like:

<img alt="placeholder" scr="pic.jpg" />

The placeholder needs to be replaced the contents of var alttext.

So far I have tried:

function replacer() {
    var alttext = document.myform.alttext.value; 
    var oldtext = document.myform.oldtext.value;
    var replacedtext = oldtext.replace("placeholder", 'alttext' )
    document.myform.outputtext.value = replacedtext;        
}

But it does not work.

How can the alttext variable contents be used to replace the placeholder?

Thank you very much to everyone!

oldtext.replace("placeholder", alttext). Note the lack of quotes. 'alttext' is a literal string, alttext is a variable. — gen_Eric
– gen_Eric, Commented Feb 28, 2013 at 17:45

Pedro del Sol · Accepted Answer · 2013-02-28 17:45:47Z

3

function replacer() {
   var alttext = document.myform.alttext.value; 
   var oldtext = document.myform.oldtext.value;
   var replacedtext = oldtext.replace("placeholder", alttext);
   document.myform.outputtext.value = replacedtext;        
}

you were trying to replace with quotes around your variable (alttext) making it a string literal

answered Feb 28, 2013 at 17:45

Pedro del Sol

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