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27 lines
1.1 KiB
Markdown
27 lines
1.1 KiB
Markdown
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---
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title: safe.JS
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description: Declares the given string as a safe JavaScript expression.
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categories: []
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keywords: []
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action:
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aliases: [safeJS]
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related:
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- functions/safe/CSS
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- functions/safe/HTML
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- functions/safe/HTMLAttr
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- functions/safe/JSStr
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- functions/safe/URL
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returnType: template.JS
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signatures: [safe.JS INPUT]
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aliases: [/functions/safejs]
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---
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In this context, *safe* means the string encapsulates a known safe EcmaScript5 Expression (e.g., `(x + y * z())`).
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Template authors are responsible for ensuring that typed expressions do not break the intended precedence and that there is no statement/expression ambiguity as when passing an expression like `{ foo:bar() }\n['foo']()`, which is both a valid expression and a valid program with a very different meaning.
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Example: Given `hash = "619c16f"` defined in the front matter of your `.md` file:
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* `<script>var form_{{ .Params.hash | safeJS }};…</script>` → `<script>var form_619c16f;…</script>`
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* `<script>var form_{{ .Params.hash }};…</script>` → `<script>var form_"619c16f";…</script>`
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