Author Archives: Jay Jay

About Jay Jay

Hi there. My name is John Elliot V. My friends call me Jay Jay. I talk about technology on my blog at blog.jj5.net and make videos about electronics on my YouTube channel @InTheLabWithJayJay.

window.resizeTo( … )

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See here:

  1. You can’t resize a window or tab that wasn’t created by window.open.
  2. You can’t resize a window or tab when it’s in a window with more than one tab.
  3. Also, even if you create window by window.open(…) it is not resizable by default …see 4.
  4. To make window created by window.open() resizable, you must open it with resizable feature
myExternalWindow = window.open("http://example.com", "myWindowName", "resizable");
myExternalWindow.resizeTo(500,500); //resize window to 500x500

Input keyboard for decimal input on iPhone

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So I needed to adjust a value (the odds of a horse winning a race) that has a fractional part and an integer part (i.e. a ‘double’, or ‘float’). The standard numeric input on an iPhone doesn’t include a decimal point, so I needed to trigger a different input device.

I ended up with this:

<input type="number" pattern="[\d\.]*" step="0.01" inputmode="numeric">

Passing selected value into HTML select onchange handler

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So you have a <select> element and you want to call a handler, but you need to pass the selected value to the handler because you have multiple instances of the same <select> and can’t access them by ID (because there is many, one of which will have the new selected value, but you don’t know which). The solution is to pass in the newly selected value, like this:

<select onchange='handle_change( this.value )'>

Easy-peasy!