Putting quotes into a form field using Javascript

This must be so simple but I'm having a brain freeze.

I have a input field :

<input value="">

I want to populate the value using javascript and the var has quotes " in it. For example, when I populate the value on page load with PHP, I'll just swap " for " (or htmlentities, etc).

But when you do the same with js then it just displays " (obviously).

开发者_如何学编程Can I just write out " without escape ?

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You need to escape the " character in the Javascript string:

var str = "I have a \"!";
//Or
var str = 'I have a "!';

You can then assign this string to the value property, or to any other property.

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For a pair of double quotes, put them inside single quotes.

<input value='""' />

Or to set via javascript

document.forms[0].elements[0].value = '""';

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If you use single quotes around your value it should work:

<input type="text" value='quo"tes' />