javascript - Error : Cannot read property 'replace' of undefined - Stack Overflow

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I have javascript code and got an error Cannot read property 'replace' of undefined. Can anyone please help me to solve this? This is my code, and I currently using jQuery 2.1.3.

ExpandableTable.prototype.updateInputBoxName=function(){
    $("."+this.cloneClass,this.target).each(function(j,t){
        var n=j+1;
        $("input,textarea",$(t)).each(function(i,v){
            if($(v).attr("name")!=""){
                var newName=$(v).attr("name").replace(/\d+$/,"")+n;
                $(v).attr("name",newName);
            }
        });
    });
    return this
};
ExpandableTable.prototype.updateInputBoxId=function(){
    var t=this;
    $("."+t.cloneClass,this.target).each(function(j,u){
        var n=j+1;
        $("input,textarea",$(u)).each(function(i,v){
            if($(v).attr("id")!=""){
                var newId=$(v).attr("id").replace(/\d+$/,"")+n;
                $(v).removeAttr("id").attr("id",newId);
            }
        });
    });
    return this
};

it says i have an error on .replace.

Please help me to solve this

I have javascript code and got an error Cannot read property 'replace' of undefined. Can anyone please help me to solve this? This is my code, and I currently using jQuery 2.1.3.

ExpandableTable.prototype.updateInputBoxName=function(){
    $("."+this.cloneClass,this.target).each(function(j,t){
        var n=j+1;
        $("input,textarea",$(t)).each(function(i,v){
            if($(v).attr("name")!=""){
                var newName=$(v).attr("name").replace(/\d+$/,"")+n;
                $(v).attr("name",newName);
            }
        });
    });
    return this
};
ExpandableTable.prototype.updateInputBoxId=function(){
    var t=this;
    $("."+t.cloneClass,this.target).each(function(j,u){
        var n=j+1;
        $("input,textarea",$(u)).each(function(i,v){
            if($(v).attr("id")!=""){
                var newId=$(v).attr("id").replace(/\d+$/,"")+n;
                $(v).removeAttr("id").attr("id",newId);
            }
        });
    });
    return this
};

it says i have an error on .replace.

Please help me to solve this

• javascript
• jquery

Share Improve this question Follow asked Jan 4, 2016 at 3:29 Ridho FauzanRidho Fauzan 16311 gold badge33 silver badges1010 bronze badges 3

• Use the debugger to figure out what is undefined and why. – SLaks Commented Jan 4, 2016 at 3:30
• As of jQuery 1.6, the .attr() method returns undefined for attributes that have not been set. – MinusFour Commented Jan 4, 2016 at 3:32
• if($(v).attr("id")!=""){ does not test for undefined. – 001 Commented Jan 4, 2016 at 3:35

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 3

Your if statement needs to check that $(v).attr("id") is not undefined

  if ($(v).attr("id") != "" && typeof $(v).attr("id") != 'undefined') {

Should stop that error.

As MinusFour said if ($(v).attr("id")) is less verbose and achieves the same thing.

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