Break on access or change of variable.

[Peng Yu]

Hi,

I don't see how to break when a variable is accessed or changed. I'm
wondering if there is a way to do so. Please let me know if I miss
anything. Thanks!

http://code.google.com/chrome/devtools/docs/scripts-breakpoints.html

--
Regards,
Peng

[Yury Semikhatsky]

Hi Peng,

You are not missing anything, data breakpoints are not supported by

Chrome Developer Tools yet.

As a workaround in some cases you could try converting your propery

into a getter and setter pair and set breakpoints inside them.

Yury

[Peng Yu]

Hi Yury,

> You are not missing anything, data breakpoints are not supported by
> Chrome Developer Tools yet.

Thanks for confirming it.

> As a workaround in some cases you could try converting your propery
> into a getter and setter pair and set breakpoints inside them.

Just to want to make sure. If I'm working some code without any of
these getter/setter pairs, in order to capture all the changes, I will
have to add getter or setter each instance a variable is accessed or
changed?

How much the performance degradation will be if all changes and
accesses are through setters and getters?

Is there any plan on implementing data breakpoint in devtools?

--
Regards,
Peng

[Yury Semikhatsky]

On Mon, Jan 16, 2012 at 5:35 PM, Peng Yu <peng...@gmail.com> wrote:

Hi Yury,

> You are not missing anything, data breakpoints are not supported by
> Chrome Developer Tools yet.

Thanks for confirming it.

> As a workaround in some cases you could try converting your propery
> into a getter and setter pair and set breakpoints inside them.

Just to want to make sure. If I'm working some code without any of
these getter/setter pairs, in order to capture all the changes, I will
have to add getter or setter each instance a variable is accessed or
changed?

That's correct. You could replace an object property with a getter/setter

pair having trivial implementation. Then you'd be able to set breakpoints

inside them. Of cause it won't work for local variables.

 

How much the performance degradation will be if all changes and
accesses are through setters and getters?

It depends on your application and how extensively the property is used.

You will need to measure it.

 

Is there any plan on implementing data breakpoint in devtools?

We've been discussing this several times but no one expressed enough

interest in implementing this. So there are no immediate plans on implementing

this feature.

Yury

 

--
Regards,
Peng

[migm...@google.com]

If you go search for it, there are plenty of people asking for how to do it and it's a feature in firefox.

I totally needed this today.  Badly.  Sadface that you don't have it.  I don't easily have the ability to inject a getter/setter pair into the code that's being required into the loaded module.

mig

[jor...@everyvine.com]

I would love to see this. Its not always trivial to refactor with getter / setter.

On Monday, January 16, 2012 6:07:14 AM UTC-8, Yury Semikhatsky wrote:

[sandro....@gmail.com]

Old post but this workaround could help: http://stackoverflow.com/questions/11618278/how-to-break-on-property-change-in-chrome

[conor....@gmail.com]

Wish wish wish we could have this as a built-in feature in chrome. Sometimes we are debugging 3rd-party code/libraries, and we want to know what triggered a modification of some property.

[gdevqui...@gmail.com]

I would pay to have this feature !!!  What happened to getting it done?  It is now the end of 2015.  I have to believe this is high on people's Dev Tools list.  Is there a current status or more current group on this outstanding request?

[PhistucK]

You can search crbug.com for an existing issue and star it. If you cannot find one, file a new issue using the "New issue" link on the same page.

Please, do not add a "+1" or "Me too" or "Confirmed" (or similar) comment. It just wastes the time of Chrome engineers and sends unnecessary e-mails to all of the people who starred the issue.

You can reply with a link to the found or created issue and might get triaged (and fixed) faster.

Note that if the issue gets a lot of stars, it might be implemented faster.

☆PhistucK

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[Tucker Connelly]

I too would like this feature :)

[PhistucK]

So search for an issue at crbug.com and star it, or file one if you cannot find one?

☆PhistucK

On Tue, Jan 12, 2016 at 5:14 AM, Tucker Connelly <tuckerco...@gmail.com> wrote:

I too would like this feature :)

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[jason...@gmail.com]

I found this one

https://bugs.chromium.org/p/chromium/issues/detail?id=154804

star to vote it, top left

On Tuesday, January 12, 2016 at 6:03:56 PM UTC+11, PhistucK wrote:

So search for an issue at crbug.com and star it, or file one if you cannot find one?

☆PhistucK

On Tue, Jan 12, 2016 at 5:14 AM, Tucker Connelly <tuckerco...@gmail.com> wrote:

I too would like this feature :)

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