setTimeout("this.disabled=false",3000); is not working

I am trying to prevent duplicated data to database when the user click the submit button multiple times within a very short time (eg double click speed). First I disable the button after one click, then enable the button again after 3 seconds. I don't know why setTimeout("this.disabled=false",3000); is not working on jquery. Please help me out, below is my codes :

$(function() { 
    $(".btnSendResp").click(function() {
        this.disabled = t开发者_运维知识库rue;
        setTimeout("this.disabled=false",3000);
        postinResp();
    });
});

---

You have the wrong this.

You need to save a reference to this in a local variable, then pass a function to setTimeout that uses the variable.

For example:

var self = this;
setTimeout(function() { 
    self.disabled = false;
}, 3000);

---

$(function() { 
    $(".btnSendResp").click(function() {
        var that = this;
        that.disabled = true;
        setTimeout(function(){
            that.disabled=false;
        },3000);
        postinResp();
    });
});