# Easy Chart Start Data Binding paramters useless?

**URL:** <https://forum.inductiveautomation.com/t/easy-chart-start-data-binding-paramters-useless/99293>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [December 2, 2024, 9:24am UTC](https://forum.inductiveautomation.com/t/easy-chart-start-data-binding-paramters-useless/99293 "2024-12-02T09:24:56Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![taohongyu88](https://avatars.discourse-cdn.com/v4/letter/t/f05b48/32.png) [@taohongyu88](https://forum.inductiveautomation.com/u/taohongyu88)\
**Post date:** [December 2, 2024, 9:24am UTC](https://forum.inductiveautomation.com/t/easy-chart-start-data-binding-paramters-useless/99293/1 "2024-12-02T09:24:56Z")

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When I open this poup  
`window = system.nav.openWindow('PC/PopuPCChart', {'startDT':startDT,'endDT':endDT,'title':u'曲线'})`

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/9/1946d070deb3210fade68464966bdd34d3ca0969.png)

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/4/54d84fdd85ebbb81866804f6dd011e3b417298e8.png)

Easy Chart Start Data Property Binding with paramters useless?

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/1/115641ad74a454f6273c98659a5580fe59b30113.png)

The startDT and endDT not change to the parameters....

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<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [December 2, 2024, 2:59pm UTC](https://forum.inductiveautomation.com/t/easy-chart-start-data-binding-paramters-useless/99293/3 "2024-12-02T14:59:04Z")

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> [@taohongyu88](#):
>
> useless

Yes, sorry.

The EasyChart rejects property assignments to start/end that would make the range invalid (reversed, whatever). Bindings don't have a defined delivery order, so breakage occurs. A scripted assignment, with order checking, is typically required.

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<div class="post-metadata">

**Author:** ![taohongyu88](https://avatars.discourse-cdn.com/v4/letter/t/f05b48/32.png) [@taohongyu88](https://forum.inductiveautomation.com/u/taohongyu88)\
**Post date:** [December 3, 2024, 1:47am UTC](https://forum.inductiveautomation.com/t/easy-chart-start-data-binding-paramters-useless/99293/5 "2024-12-03T01:47:36Z")

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Easy Chart ----Scripting--- configChart  
Then it's right!

```python
self.startDate = self.parent.startDT
self.endDate = self.parent.endDT

```

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/4/e4917ecdc2f724f8dc2160485afc0851745ad0b1.png)