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32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
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---
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title: safeJS
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# linktitle:
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description: Declares the provided string as a known safe JavaScript string.
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godocref: https://golang.org/src/html/template/content.go?s=2548:2557#L51
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date: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2017-02-01
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categories: [functions]
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menu:
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docs:
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parent: "functions"
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keywords: [strings]
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signature: ["safeJS INPUT"]
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workson: []
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hugoversion:
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relatedfuncs: []
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deprecated: false
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draft: false
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aliases: []
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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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* <span class="good">`<script>var form_{{ .Params.hash | safeJS }};…</script>` → `<script>var form_619c16f;…</script>`</span>
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* <span class="bad">`<script>var form_{{ .Params.hash }};…</script>` → `<script>var form_"619c16f";…</script>`</span>
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