55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
use web_sys::{window, Document, Window};
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pub fn get_window_document() -> Result<(Window, Document), String> {
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let window = window().ok_or_else(|| String::from("Failed to get window"))?;
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let document = window
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.document()
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.ok_or_else(|| String::from("Failed to get document"))?;
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Ok((window, document))
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}
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pub fn append_to_info_text(
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document: &Document,
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id: &str,
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msg: &str,
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limit: u32,
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) -> Result<(), String> {
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let info_text = document
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.get_element_by_id(id)
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.ok_or_else(|| format!("Failed to get info_text \"{}\"", id))?;
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let height = info_text.client_height();
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// create the new text to be appended in the text
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let p = document
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.create_element("p")
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.map_err(|e| format!("{:?}", e))?;
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p.set_inner_html(msg);
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// check if scrolled to top
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let at_top: bool = info_text.scroll_top() <= height - info_text.scroll_height();
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// append text to output
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info_text
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.append_with_node_1(&p)
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.map_err(|e| format!("{:?}", e))?;
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while info_text.child_element_count() > limit {
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info_text
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.remove_child(
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&info_text.first_child().ok_or_else(|| {
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format!("Failed to get first_child() of info_text \"{}\"", id)
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})?,
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)
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.map_err(|e| format!("{:?}", e))?;
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}
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if at_top {
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info_text.set_scroll_top(height - info_text.scroll_height());
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}
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Ok(())
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}
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